Changelog

Project started 3 March 2026 — updated almost daily.

v2.0.0 beta — October 10, 2026

Editor

FixedA two-pole changeover switch that already carries N is no longer turned into a four-pole one when an older board is opened.

ImprovedA bus’s name, occupancy and feed now show in its hover card instead of captions on the canvas. DIN-rail buses are drawn as a 9 mm bar in a holder coloured by the bus type, and bare bus bars have square ends.

ImprovedThe Cables section explains each cable’s state: «Undersized», a specific cause for «Not sized», and the bulk action says exactly what it will change.

AddedNeutral buses (N and PEN) now always show where they are fed from: the bus panel has a chip with the source, the reason when no source is set, and a one-tap «Confirm» suggestion. If deleting a rail or changing its width would cut a bus off from its supply, the editor offers «Disconnect the bus and continue».

ImprovedThe toolbar menus, mobile sheets, minimap, bug-report and ticket windows, project selector, notifications, consumers drawer, AI chat and the comb, bus and wiring panels now share one technical look — the same square corners, spacing and buttons.

FixedA comb mounted below the devices is now an exact mirror of one above them, and a changeover switch lever no longer overlaps a load-side terminal.

ImprovedBuses (above and below the rails, and side buses) and combs are redrawn to real catalogue dimensions: a comb is one moulded body over the modules with coloured phase collars and its rating printed on it, a comb with no supply assigned carries an amber «?», a wire that crosses a comb is drawn over it, and clicking a comb body selects it. Cable lengths of combs and buses were recomputed for the new geometry (changes of up to 5 cm).

AddedHovering a device shows a card with its name, conductors, rating, load and its most serious problem. The right-click menu and the «⋯» button in the properties panel open the same set of actions; unavailable actions stay in the list with the reason why.

AddedOn a phone, tapping a device shows its card with «Properties», «Actions» and «Terminals» buttons; the problem line opens the checks scrolled to that device («Show in checks»), and the board pans so the panel never covers the tapped device.

AddedEvery device now has short role marks beside its terminals (input, output, PE, coil, auxiliary contact…), spelled out in words on hover on a computer; terminal markings follow the actual product.

FixedIf a project fails to load, the editor, export and label printing show «Couldn’t open this project» with «Try again» and «Back to projects» — instead of an empty or foreign board.

ImprovedIf a saved combination of width and option cannot exist (for example an earthed socket in 1 module), the device is flagged on the canvas and the panel offers a choice: keep the width without the option or keep the option at the matching width.

AddedNew «Rails» mode (key D): select a rail and manage it — move it up or down (buttons, Alt+↑/↓ or drag; devices, buses and wires travel with it), insert a new one between rails, duplicate it (Ctrl+D) and delete it after moving its devices to another rail. A rail is named «Rail N — your name» and the number always follows the order; an empty board shows an «Add first rail» card.

AddedEach rail now has its own width (12, 18, 24 or 36 modules, ±1 module, the [ and ] keys, a handle at the rail’s right end, or «All»). Nothing moves while the devices still fit; if they no longer do, the editor asks whether to move only those that do not fit, close the gaps, move them to another rail or delete them. On a phone the width is changed in a sheet with a live preview.

AddedA device from the palette can be placed without dragging: click it (or press Enter or «Place on the board») to hold it «in hand», then click a free spot on a rail; the arrow keys pick the spot and Esc cancels. On a phone a placement strip replaces the sheet.

AddedNew «Ruler» tool (key R): drag from point to point to read the distance in millimetres and modules; the measurement snaps to wire and rail ends.

ImprovedThe terminals and tiers of an ATS (transfer switch) are laid out as on the real product: reserve inputs are screws on the second tier with tier labels, for 2P and 4P. Old boards are updated automatically, and any hand-routed wires this affects are reset with a notice.

AddedA bus on a DIN rail can now be «Bare» or «Insulated» (the «Insulation» field in its properties); off the rail only a bare bus is available. N/PE captions on buses no longer overlap.

ImprovedA wire now ends on the terminal screw rather than next to it, and each SPD cartridge shows its class mark (T1/T2/T3).

Added«Potentials» panel (key L): a list of electrical nodes grouped L1…PE with «from → to» captions; clicking a node isolates it — its wires light up and the rest dim, and ↑/↓ step through the nodes. Beside it are filters for phases, N/PE and sources (N and PE are shown by default); an active filter is visible on the button and in a «Shown: …» pill.

Added«Probe» mode (key P): click a wire to highlight its whole electrical potential, and a second point checks continuity — whether the two points are one potential or different ones. «Numbering» mode (N) labels wires with node numbers (L1-2, N-3…).

ImprovedThe device palette is redesigned: thumbnails show the real look of each device, search fixes a wrong keyboard layout and looks in names, descriptions and fields, the palette width can be dragged (double-click resets it), there are «Favorites» (☆) and «Recent» sections, and an «About the device» card shows its connection variants and what can be configured. The palette can be collapsed; on a phone it is a sheet with group chips.

AddedA tool column now sits on the left of the editor: «Select» (V), «Hand» (H) — pan the canvas without grabbing devices, «Wire» (W) and the «Potentials» panel (L) with phase, N/PE and source filters. The wire button and the filters moved out of the top menu and the palette can be collapsed; on a phone there is a mode button with a «Tools» sheet.

ImprovedThe ATS width now matches the real product (3 modules by default, 5 for 4P). Old boards are updated when opened, with a notice, and captions on the board may shift slightly.

FixedChanging a device’s width no longer silently overlaps its neighbour or a bus on the rail: the nearest free spot is used, and if there is none the editor explains the refusal.

FixedAn output comb no longer gets re-phased or rewrites the supply of its devices when its feeder or phase changes, and its devices are no longer shown as «locked by the comb».

ImprovedThe editor now refuses changes that would silently corrupt the board — the same phase on two poles of one device, a reference to a deleted device or comb, a device losing its supply — and explains why in a «Change rejected…» notice; undo/redo and wire edits go through the same checks.

ImprovedDragging a wire handle shows a live preview of the route on the canvas and is saved as one step, so a single undo reverts it.

ImprovedThe phase pair of a two-pole device (L+L) is chosen with a segmented switch, like L+N, instead of a drop-down list.

ImprovedChoosing a power source in the device panel is now one form: one contact — two rows (source and phase), and one row per contact on multi-pole devices; unavailable options are disabled up front with the reason, and a refusal is no longer silent.

FixedChanging the phase of poles now carries over the per-pole supply of child devices and combs, resets outdated wire routes, and no longer loses the wire of a two-pole pair.

FixedFixed data loss: «Merge sources» no longer erases a live parent, switching 2P mode no longer resets the chosen phase, and deleting a rail no longer leaves devices pointing at a parent that no longer exists.

FixedWire handles (vertical and horizontal) no longer get stuck after an interrupted gesture, for example on a touch screen.

ImprovedDevices on the canvas now have real proportions: height and width in millimetres (an ATS is no longer shorter than the real part) and a device sits on the rail instead of hanging from its top edge. Captions, handle diamonds and terminals are no longer stretched or squashed (captions used to be compressed by about half), and wire thickness no longer depends on its direction.

ImprovedDevices on the canvas are drawn realistically: moulded bodies with seams and chamfers, screw terminals in round sockets, relief and indicator glass; the type colour stays as a thin stripe while the bodies are light grey like real modules. The rail is now a TS35 hat profile in steel with slots.

ImprovedA compact variant of a device is now chosen by width («Modules (width)» = 1) instead of a separate «Form factor» checkbox. The socket has two bodies — 1 module (without earth only) and 2.5 modules (43.75 mm) with earth — and a single rating (10, 16 or 20 A); the width of the 4P changeover switch is corrected to 70 mm.

FixedChanging a bus phase no longer destroys the source of the neighbouring phase: if a device is already fed from another bus on that phase, the editor refuses the change and asks you to change that device’s source first.

AddedBuses and combs: a «Bus rated current (A)» field with quick picks (63, 80, 100, 160 A) was added. If the rating is left empty the app substitutes nothing, and the overload check plainly says that no rating is set.

AddedAn AFDD can now be given a characteristic (B, C or D), and RCBOs, AFDDs and fuses a breaking capacity (kA); the short-circuit and selectivity calculations use it.

AddedPower source filter (in the «Potentials» panel): show the load for one chosen supplier only — grid, inverter, generator… Devices of other sources dim, and the load meter shows the total for that source (for a transfer switch — «via …, when switched»).

AddedBreaker properties now have a «Wire to the appliance» section (length, section and PE; a suggested section is marked «suggested»): this data enters the short-circuit calculation. A «Critical circuit» switch makes selectivity mandatory, and gG/gG fuses are checked by rating ratio.

AddedVoltage, phase-sequence and multifunction relays have a «Neutral» choice under «Connection»: Auto / Pass-through / Reference (reference by default — the relay drives an external contactor). The neutral checks no longer invent an N output the relay does not have.

ImprovedPhase balance can be switched between A and kVA (the choice is remembered); the load meter shows per-phase current (A) first and apparent power (kVA) second. The «Wiring» and «Short-circuit currents» panels no longer overlap.

ImprovedPower source is now selected the same way for every device: a normal device has one «Source» field, while a transfer switch (automatic ATS and manual 1-0-2 changeover) has two — «Main» and «Reserve». The source role (grid, generator, inverter…) is set right on the source itself.

AddedA source’s properties (inverter, plant) now have a «Grid interaction» block: grid-tied, hybrid or off-grid, plus capacity in VA. New check: a critical circuit whose only backup is a grid-tied inverter will have no power when the grid fails (anti-islanding).

ImprovedThe device properties panel is redesigned: fields without extra borders and sections «Main», «Connection», «Hierarchy» (devices grouped by the flow of power), «Cable» and «Load». The terminal editor shows a «Direct schema», and a terminal’s colour is the colour of its conductor everywhere — panel, diagram and PDF.

Improved«Panel settings» is redesigned: «Network» and «Validation» sections, ready-made network presets (phases, earthing, voltage, frequency), a compact summary when collapsed; the side panel can be collapsed.

ImprovedThe load meter is now a single capsule with the supply load percentage (coloured at the 70 % and 90 % thresholds); on narrower screens opening it shows per-phase load in kW or A, phase imbalance and a source legend.

FixedOn a phone, renaming a project no longer pops up the keyboard immediately: the sheet opens with the name first, and editing starts with the «Rename» button.

Checks and calculations

FixedA neutral bus that has consumers but no supply is now flagged, and it can be given the grid supply in one tap. A bus can no longer feed itself.

FixedDeleting a supply source no longer silences the safety warnings of the devices it fed.

ImprovedIn the short-circuit current panel each circuit now takes a single summary line by default; details open on click.

AddedNew check: when a bus supplies single-phase loads, the N conductor of the cable feeding it must not be smaller than the incoming phase conductors (DBN V.2.5-23, cl. 8.9).

FixedOld boards with no saved voltage now get 400 V between phases instead of 398 V.

ImprovedThe cable calculator and the power converter now count three loaded conductors on a three-phase line: the permissible current of some sections is lower and the recommended section is larger in some cases; values beyond the table are marked as manufacturer data. The converter sizes the cable for the breaker rating shown in the result.

AddedNew checks instead of silence: the board now says outright when it cannot identify the protective device above a cable (for example with a per-phase comb supply), when the protective device’s let-through energy (I²t) is unknown for the thermal-withstand check, when installation conditions (over 20 circuits in a group, high temperature) fall outside the correction table, and when the reserve source of some ATS poles has been deleted.

ImprovedWhen the short-circuit current at the incomer is not set, the board gets one general finding instead of a warning on every incomer; the «Ik at incomer» field says which current to enter — three-phase for a three-phase board, single-phase for a single-phase one.

ImprovedBoards under IEC or NEC no longer show PUE/DBN/DSTU references or wording — citations come from the board’s own standard; 23 wrong references in the checks were replaced or removed.

Improved«Circuits in the bundle» in panel settings counts circuits (a multi-core cable is one circuit) and accepts only a whole number from 1 to 50; the «protection exceeds cable» check now applies the temperature and grouping corrections and explains them in the message.

FixedThe panel no longer says «characteristic not set» when the breaker curve is set; if the curve is stored differently in different fields, a finding now shows it.

AddedNew check: two poles of one device cannot carry the same phase.

ImprovedComb and bus feeders are now full cables: the section is sized automatically from the breaker rating, as for device cables. They appear in the cable overview with «Auto» / «Not sized» badges, in the bill of materials and wire list (marked as calculated or set by you) and in the AI consultant’s context; a comb feeder’s length now reaches the bill of materials.

AddedPanel settings now offer a checks regime: «Ukraine» (PUE · DBN · DSTU) or «IEC» (IEC 60364). If none has been chosen yet, it is assumed from the interface language and this is marked.

ImprovedA board saved by a newer version of the app opens with checks and calculations switched off (the panels say why), so outdated rules cannot give false results.

FixedA deliberately chosen 2.5 mm² section is no longer read as «not set», and for XLPE/EPR insulation without a table no recommendation is given without a current check.

AddedNew check: a socket without a 30 mA RCD is now an error (DBN V.2.5-23, cl. 7.24) — such a circuit used to stay green.

FixedThe neutral section of a three-phase comb now accounts for triplen harmonics (16 mm² instead of 10 mm² on a sample board).

FixedAn underground cable is no longer derated with the air-temperature factor, and a fractional or invalid number of cables in a bundle is no longer treated as «no derating».

FixedThe voltage-drop calculator now uses copper and aluminium resistivity at 70 °C (the temperature is shown), the same as the editor; the voltage drop comes out about 29 % higher than before. The cable thermal check no longer gives a verdict on an invented section or on a cable displaced by a comb.

FixedIEC norm badges no longer link to a page that does not exist (there were 33); citations of switched-off standards are dimmed with a hint instead of disappearing.

FixedIn the other languages 16 check messages stayed in Ukrainian and 29 norm references in the checks were wrong — fixed.

ImprovedThe short-circuit panel is redesigned: results are split into «Problems», «Warnings» and «provisionally OK», with disconnection (Zs) and breaking capacity (Icu) shown separately along with what to do and a link to the field to fix. The panel and the calculator now use the same data and measured wire lengths.

FixedRemoved false warnings: about missing N isolation between RCDs (when an RCD takes its incoming N from a shared bus) and the noisy «equal rating» selectivity notices on normal boards.

FixedThe load of downstream devices is now counted in full — also for devices connected per pole and after a parent is deleted: an overloaded breaker is no longer shown as fine.

FixedAn assumed breaking capacity (6 kA by default) and an empty board summary are no longer read as «Safe»; a comb fed from a phase bus is no longer treated as fed from the grid.

ImprovedThe checks panel is redesigned: lighter, with severity chips and full titles; on a phone it is a bottom sheet with a counter button that closes with a swipe down.

ImprovedThe section recommendation now names its reason (voltage drop or current) and is based on the nearest protective device that actually limits the cable current rather than on the parent device; auto-sizing also considers the cable’s thermal withstand of the short-circuit current. In the «Cables» section badges show auto / manual / «Not sized», and there is a «Switch all to auto» button.

Export and print

FixedThe equipment specification (XLSX and CSV) is written in the interface language.

FixedIn the bill of materials and the wire list, a cable whose phase, N and PE sections differ is no longer printed as «5×16» — the actual composition is shown.

FixedOld .eboard files on import, and boards opened from a public link or after a sync conflict, are no longer left in an outdated format.

ImprovedThe label generator warns when a label width taken from the module count does not match the measured body of the device (for example a 43.75 mm socket against 36 mm), and the width of a single cell can be typed in by hand.

Site

FixedA support-ticket link opens the sign-in when you are signed out and returns you to the ticket after signing in.

AddedFor non-Ukrainian languages you can support the project through Ko-fi in a window on top of the editor; the Ukrainian version keeps the monobank jar.

ImprovedThe PUE and DBN reference pages show the edition and its status: the 2017 edition of PUE is superseded and the current one is PUE:2026; norm badges in the checks name the edition.

FixedFixed Ukrainian leaking into other languages: some messages and hints contained Ukrainian words or showed a technical code (for example «Error: mixed_pole_conflict»).

ImprovedThe language picker is now a list with a flag and the native language name instead of a grid of codes.

v1.14.0 — July 10, 2026

FixedRemoved false validation warnings — after the meter, on phase buses, passive neutral and the voltage relay.

ImprovedDocumentation fully revised and translated into all 7 languages — previously Ukrainian and English only.

ImprovedUpdated the support channel — bug reports go to a ticket system, with Telegram added for contact.

AddedQuick search in the PUE, DBN and IEC references — press ⌘K or / to find a clause by number or text.

AddedThe IEC 60364 reference is now available in all 7 languages — Czech, German, Spanish and French added.

ImprovedRedesigned the IEC standard pages — each standard shows its topic, plus an intro, source and FAQ.

AddedNew short-circuit current check — whether protection trips in time and the breaker can withstand the fault current.

AddedIEC 60364 clauses now include plain-language explanations — as already available in the PUE and DBN references.

ImprovedClause text in the PUE, DBN and IEC references is now clearer and easier to read.

ImprovedRefreshed site navigation — one consistent header and footer across all pages and a redesigned mobile menu.

v1.13.0 — July 5, 2026

Editor

AddedEditing one board on your phone and computer? The app detects the conflict and lets you choose which version to keep.

AddedA board from a newer app version now opens read-only, with an “Update the app” button.

ImprovedA corrupted board is no longer lost — a backup copy is kept and you can start from a fresh board.

ImprovedRCBO, AFDD and fuses can now act as a power source for downstream devices.

ImprovedCollapsed sections in the properties panel are now remembered per device type.

FixedFixed wiring for surge protectors (SPD) — removed a spurious phase output.

AddedDevices downstream of a transfer switch (ATS / 1-0-2) now show every possible power source — e.g. “Grid / Inverter”.

FixedA reserve source (inverter, generator) is now shown correctly on devices below a transfer switch.

ImprovedThe inspector’s “Source” section is simpler — input choice and source role in one place, with cleaner headers.

ImprovedRemoved the duplicated conductor display in the “Connection” and “Phase” sections.

FixedDevice terminals are no longer flagged as modified when you open a saved project.

FixedThe reserve-input jumper now moves to the correct terminals after a source swap.

ImprovedTerminal editor: readable jumper labels, a more compact terminal card, and a clearer connections section name.

FixedThe manual bridge builder now offers only the hand-created types; system-managed ones were removed.

ImprovedTerminal topology editor: the device diagram stays visible, and feed direction is set right on it.

FixedThe jumper bar and comb on the diagram align precisely with their terminals, even after reordering.

ImprovedSmoother canvas interaction while dragging on large boards.

AddedTerminal placement: drag a terminal along the device edge — the position shows on the diagram instantly.

ImprovedTerminal cues: color by wiring standard, in/out direction, and a reserve-source marker.

FixedFixed undo/redo for several actions that could desync from the canvas.

FixedDragging a label or busbar no longer saves an accidental shift if it gets interrupted.

AddedNew device terminal editor: set markings, placement, and jumpers — everything applies instantly and syncs to the diagram.

Checks and calculations

ImprovedFor TN-C-S systems you can now set where PEN splits — clears a false warning on apartment consumer units.

FixedA time relay can now power downstream devices — cleared a false “powered from a device with no output” warning.

FixedAn auto-sized cable no longer raises a false overheating warning — its section comes from the recommended value.

FixedA cable with a section below the table no longer gets a fabricated ampacity — it is flagged as unknown.

FixedA 3-phase load without neutral is no longer shown as an N-busbar consumer.

Site

FixedFixed the iOS home-screen icon and link previews on social media.

AddedThe blog is now available in 6 languages with localized URLs, dates and rich search snippets.

v1.12.0 — June 18, 2026

AddedBusbar terminal manager: drag to reorder connections, pin devices to specific terminals, and reserve free terminals — changes sync to the diagram.

ImprovedThe N/PE busbar connection list now shows all terminals (free and reserved) plus a dedicated neutral-source row.

FixedThe N busbar no longer lists devices that aren't connected to it, and no longer duplicates a phantom «Mains N input».

FixedA manual 1-0-2 changeover no longer triggers false validation warnings or duplicates the neutral wire on the busbar.

AddedNew check: parallel neutrals from multiple sources (grid + inverter/generator) without an N break.

AddedTerminal selection for busbar wires — choose which terminal a wire lands on and pin it; passive connections are marked on the busbar.

AddedNew «Nodes» label mode — numbering by potential (one electrical node = one number, L1-1), as on a wiring diagram.

AddedIn «Nodes» mode, clicking a wire highlights its whole equipotential node — every terminal at the same potential.

ImprovedTerminal numbers on the diagram and connection list now match real device markings (1/2, 3/4 per IEC).

FixedClicking a wire’s number label now selects the wire — previously only hover responded.

ImprovedWire-number labels on the wiring diagram no longer overlap — they spread out readably near their terminals.

ImprovedPrint & export overhaul: wiring diagram with wire numbers, labels with cut lines, automatic page orientation and centring.

ImprovedExport page menu redesigned: grouped, responsive, and pinned to the top while scrolling.

ImprovedPanel-schematic wires now print crisply, without thin hairlines.

ImprovedThe diagram is now correctly centred when a board opens — small boards are no longer shifted aside.

ImprovedThe board view resets to the default position after a page reload, but is kept while navigating.

v1.11.0 — June 14, 2026

ImprovedBus properties fully reworked: owner & phase selection, automatic feeder cable length, unified style with the device panel.

FixedA phase busbar no longer disappears after reloading the page.

ImprovedChangeover switch is now labelled 1-0-2; clearer N-bus "Input" / "Output" captions.

FixedTicket and AI-chat panels now close when you select an object on the panel.

FixedManual label font size is no longer overridden by autoshrink; added schematic scrolling on small screens.

FixedFixed a server error on reference and documentation pages; removed forced switching to English.

FixedThe editor no longer resets your chosen interface language while navigating.

ImprovedThe blank filler can now be freely placed on the rail with selectable width (0.5-module steps).

v1.10.1 — May 25, 2026

FixedRestored device palette scrolling on mobile while dragging.

v1.10.0 — May 24, 2026

Editor

AddedAdded a "Blanking plate" device to reserve or fill empty slots on the rail.

FixedClicking a breaker opens its properties panel again (drag-and-drop regression).

ImprovedImproved drag-and-drop reliability on mobile devices.

FixedFixed undo/redo correctness.

FixedFixed rare data loss when quickly switching or duplicating projects.

AddedBoard editor fully in English: panels, properties, dialogs, cable editor.

AddedLanguage switcher also available in the shield editor toolbar — for authorized users without navigating to the homepage.

Checks and calculations

FixedRestored 5 regulatory checks in the board’s checks panel (wet zones, AFDD, selectivity and RCD class).

Export and print

AddedValidation panel and exports (PDF, BOM, labels) are now in English.

Site

ImprovedFaster landing-page load and smoother mobile rendering.

ImprovedCloud project saving is now much lighter — less traffic and faster.

AddedSite now available in 5 more languages: Polski, Čeština, Deutsch, Español, Français.

AddedLanding, all 13 calculators, docs, terms and privacy — fully in English.

AddedEnergy cost calculator reworked for the EU: country presets, currency and tariffs.

ImprovedThe changelog is now available in English.

ImprovedThe AI consultant answers in the interface language and cites standards correctly.

FixedBlog is now empty for non-Ukrainian locales instead of showing Ukrainian articles; fixed image 404s.

AddedLanguage switcher in site header — 7 locales (Ukrainian/English/Polski/Čeština/Deutsch/Español/Français).

AddedSite runs on 7 locales at /en, /pl, /cs, /es, /de, /fr — Ukrainian stays without a prefix.

ImprovedPUE and DBN guides hidden for non-Ukrainian visitors — only international IEC remains in the menu.

AddedAI consultant references 28 clauses of IEC 60364 trilingually (Ukrainian, English, Polish).

AddedAI consultant responds in the interface language — choose /en and get English answers, /pl Polish, etc.

AddedNew /iec section — IEC 60364 reference with search and clause navigation (28 key clauses).

AddedCross-references between PUE/DBN/IEC clauses — clickable «see also» and «depends on» in each clause.

ImprovedAI consultant shows related clauses in IEC/PUE/DBN answers — faster navigation to adjacent standards.

v1.9.0 — May 17, 2026

Editor

ImprovedButtons in four interface elements were enlarged to 44 px so they are easier to tap on a phone.

AddedAdded Schuko socket (DIN-rail) — 28th device type with realistic visuals and ratings 10/16/20 A.

AddedVoltage relay and multifunction relay now support power direction inversion (bottom connection).

FixedFixed saving terminal count in PE/N busbars — changes now reliably persist after reload.

Fixed«Delete bus» now cascades and removes residual references when deleting a bus.

Checks and calculations

Added5 new cable checks per IEC 60364: ambient temperature, grouping, harmonics on N, thermal resistance, AFDD in bedrooms.

AddedPanel settings now include ambient temperature, cable grouping and harmonic load for more accurate cable sizing.

FixedRemoved false check warnings for single-phase TN-C-S layouts where the neutral bypasses the RCD.

FixedRemoved a false neutral warning for mixed loads under an RCD (some with N, some phase-only).

Site

AddedNew blog article — «Electricity Tariffs 2026» with 21 infographics.

ImprovedThe 13 calculators got FAQ sections and grouping by category for easier navigation.

ImprovedThe home page loads noticeably faster — the main image and animations were optimised.

ImprovedAI consultant filters links by the project’s active standard — on an IEC project it doesn’t show PUE.

ImprovedThe AI consultant sees the project name and refers to combs and buses by their names instead of internal codes.

AddedTables in AI consultant replies — comparisons and lists are now shown as tables.

ImprovedThe AI consultant no longer invents data about unknown breakers — unsupported claims are filtered out.

FixedInternal markers such as [i3-i5] no longer appear in AI consultant replies.

AddedThe AI chat now streams the answer during an audit — you no longer wait for the full cycle to finish.

ImprovedThe AI consultant knows which page the question came from, plans its answer better and switches to a stronger model for complex questions.

ImprovedDeclining off-topic questions is now faster and gentler.

FixedMinor UX fixes in AI chat: streaming state, source buttons, message copying.

ImprovedUnread message counter in support chat clears instantly when opening an active dialog.

ImprovedSupport chat improved: text formatting in messages, reopening closed tickets, auto-scroll to the latest message and a refreshed message box.

ImprovedSeparate forms for new tickets and bug reports, each with its own icon and fields.

ImprovedSupport panel and AI chat state persists across page reloads.

ImprovedIn support chat, files clear after sending; admin replies arrive instantly without page reload.

ImprovedPUE and DBN references in AI consultant replies are now clickable — open directly in the reference guide.

ImprovedAccessibility: larger tap targets on mobile, arrow-key navigation in the screenshot viewer and a full-screen screenshot view.

ImprovedSpeed: autosave is twice as fast, the landing page is about 230 KB lighter and the AI consultant answers faster.

ImprovedThe home page opens faster — the headline block now renders quicker.

ImprovedParallel file upload in bug reports — 5 files simultaneously instead of sequentially.

v1.8.0 — May 10, 2026

Editor

ImprovedFaster navigation around the editor.

FixedFixed wire routing when parent is on a rail below child — wire now goes down and routes around the diagram via the left channel.

AddedMulti-pole breakers (3P, 3P+N) can have a separate source per phase — useful for split-phase boards and transfer switches.

AddedOne power-source picker for every device — the same everywhere, with unavailable phases filtered out.

AddedInline breaker addition to busbar — «+» button directly in properties.

ImprovedA notification when buses are added from the palette, plus an improved cable section.

FixedFixed the interface freezing when switching phases quickly and opening the power-source picker.

FixedRemoved spurious conductors from an L bus to breakers whose source is set for only some of the poles.

Added1P+N and 3P+N combs: the L and N conductors can have different parents.

AddedBus source: the picker prevents invalid neutral connections.

ImprovedWire colour references adapt to the active standard (DBN/IEC/NEC).

Checks and calculations

FixedFixed current calculation for 3-phase breakers — previously showed inflated value causing false overload warnings.

FixedLine voltage now displays 400V instead of computed 398V — uses standard pairs per IEC 60038.

FixedThe missing-N-bus check no longer fires when the board already has a common N bus (typical case: 1P+N breaker + LED).

AddedInline «👎» report next to each validation warning — quick feedback without navigation.

ImprovedCable core count automatically determined from breaker type — no longer need to manually select 2/3/4/5 cores.

FixedThe cable recommendation in the top bar and in ATS/changeover properties is now consistent — both use the real rating of the breaker upstream.

FixedRemoved false «AB exceeds cable» warning for root-located AVR.

FixedAVR/switches automatically receive both input cables when opening old panels.

ImprovedCables inside the panel get their length automatically from the wire route.

ImprovedVoltage drop of an ATS reserve cable now accounts for current through the bridges.

Export and print

AddedSchematic: several power sources (for example grid and generator), each with its own rails and per-pole wires.

AddedDownload equipment specification as XLSX or CSV via «📥 Specification» button on export page — for supplier handoff.

AddedThe XLSX sheet has ordering columns (manufacturer, model, part number, supplier, price, status, date) and an order-progress block.

ImprovedThe spec sheet is a native Excel table: add rows at the bottom and the qty × price formulas and totals recalculate automatically.

ImprovedBOM now includes cable core count (n×s mm² format) and summary table aggregated by cross-section.

ImprovedThe export page is reworked: a separate labels section, a single landscape A4 print, and QR codes no longer jump while loading.

FixedOn EPS, neutral for voltage relays and multifunction relays now shown as a solid line through the symbol.

FixedFixed horizontal sticker text color on export page — blended with background in dark mode.

AddedThe schematic diagram (EPS) is reworked — a labels settings panel, A4/A3 printing, a popup for each symbol and draggable labels.

AddedLoad labels on the mounting diagram — full device names above the DIN rail in PDF with orientation control and part visibility.

FixedMinor EPS fixes — breaker rating no longer overlaps the wire, light theme independent of editor theme, vertical label centering.

AddedBusbar and busbar cable sections separate in register and BOM — some cables were previously missed.

Site

AddedSupport is now a full chat: the conversation with an admin lives in one dialogue, with a «Ticket» button in the editor toolbar showing an unread counter.

AddedLive notifications for support replies — unread counter updates automatically without page reload.

ImprovedMinor support improvements: local autosave of ticket text, lightbox for screenshots, image compression to 1024px.

ImprovedTickets now have direct links of the form /t/<id> (instead of /inbox).

FixedFixed a crash of the bug-report form after deleting a screenshot before it was processed.

AddedAI consultant answers per DBN B.2.5-23:2025 — in addition to PUE, with references to specific clauses.

AddedBug reporting (Beta) — «Bug» button on canvas, problem description, up to 3 screenshots, panel data attachment.

ImprovedAI consultant on desktop now opens as a right-side panel, styled like Properties.

ImprovedFonts are now served from our own server — a faster first paint and no requests to third-party services.

v1.7.0 — April 27, 2026

AddedA new cable system: every cable has typed cores (phase, N, PE). Existing boards are upgraded automatically.

AddedCable section recommendation: Cu/Al × PVC/XLPE × ambient temperature × grouping — the same result for the same input.

AddedCable overview in wire mode — a list of all cables with filters, an «Accept recommendations» button and an editor that highlights the cable on the canvas.

AddedChecks under several standards — choose standards in panel settings (DBN/PUE/IEC, several can be selected).

AddedAn active-standards chip in the checks panel header and 5 new checks: RCD polarity, type B/F, wire colours, portable generator, inverter.

AddedThe AI consultant sees cable length and the reserve cable — answers with real numbers.

AddedDefault voltage changed from 220 V to 230 V — aligned with DBN.

AddedUI redesign of switchboard settings — presets, section grouping, validation-critical parameter priority.

FixedRemoved a false «cable may overheat» warning for the ATS reserve cable — it is now compared with the real breaker upstream.

FixedThe cable editor and the overview row showed different section recommendations for cables through an ATS — they now match.

ImprovedCable overview accessibility: keyboard navigation and screen-reader support.

v1.6.0 — April 26, 2026

Editor

AddedPhase distribution buses (L1/L2/L3) are now a full element of the board, tied to a distributing device.

AddedPhase combs can be fed directly from an L bus — one wire instead of several to each breaker.

Added5 wire-thickness presets in the wire mode panel.

FixedAuto-fix of the N conductor under an RCD/ATS now routes it through the device’s own bus, not the common one.

FixedAuto-creating an N bus under an RCD now counts a comb as one more consumer.

FixedFor the chain «Main → L bus → SPD → RCD → breaker» wires now pass through the intermediate devices.

AddedPhase selection (L1/L2/L3) in single-phase comb properties, inherited automatically from the parent.

AddedImproved bus input-source selection — breadcrumbs, auto-fix notices and a two-step ATS wizard.

FixedCombs: locking of member parameters is controlled by the comb rather than by each device.

FixedCombs: members re-parent automatically when the feeder changes, and a check catches RCD bypass.

Added2P mode for two-pole devices — L+N (single-phase protection) or L1+L2 (inverter/generator split-phase).

Added1-0-1 switch in 2P L+N variant for single-phase board with inverter/generator.

AddedN buses for RCD/RCBO/ATS/changeover are created on the first switch of a child to «Via bus» and removed when all children are back on «Direct».

Added«Default cable routing» setting in board settings. Global default — «Exposed on wall».

AddedRCBO 1P+N — supports width up to 4 modules (ETI KZS-2M Type B / 125A).

AddedAn SPD now has a separate PE terminal on the output side — it no longer overlaps the N input.

AddedN comb busbar can be fed from 4P cross-module, RCD, or ATS — not only from N busbar.

AddedCombs are grouped in the bus connection list: an N comb with 5 breakers is now one expandable row.

FixedAn SPD can no longer own an N bus; outdated invalid links are cleaned up automatically.

FixedThe PE wire from an SPD now lands exactly on the green PE dot of the bus (it used to be offset).

FixedThe comb type is determined by the actual set of conductors, not by the first breaker.

AddedATS/changeover — backup input cable separate from main. Separate section in properties + BOM position with independent validation.

AddedATS/changeover 4P — automatically creates a separate N busbar per IEC 60947-3.

FixedThe N wire to a separate ATS bus now takes a local route instead of going around the right edge of the canvas.

FixedDragging a wire: aligning the handle with the terminal no longer resets the wire to a long detour.

FixedWires between rails with the same X: one handle in the middle and a symmetric Z-shaped bend while dragging.

FixedRCBO — removed duplicate 2P and 4P connection variants.

Improved× button to clear search in device palette.

Checks and calculations

Added4 new soft checks for phase routing and a phase bus current limit with an overload warning.

AddedAn «ATS interlock» checkbox in ATS/changeover properties — checked against IEC 60947-6-1.

FixedReferences in the checks for PUE chapters 7.1–7.4 and 7.6 now point to the standards in force in Ukraine (DBN/IEC).

ImprovedAn AFDD is now recognised as overcurrent protection — no more false warning about a missing breaker.

Added5 new strict checks per PUE/IEC: PEN is not switched, 4P incomer for TT/IT, N isolation between RCD zones, ATS interlock.

AddedSupport for 7 standards (PUE/DBN/DSTU/IEC/NEC/BS/PN). The default standard for new projects is DBN.

FixedVoltage drop — correct √3 factor for 3-phase calculation.

Added3 new checks: inverter/generator without a breaker upstream, N unreachable through a 2P L1+L2 chain, overload of a direct N under an RCD.

Added3 new neutral checks: a closed loop, input/output mismatch and a wrong feeder.

FixedThe upstream-breaker check now looks through devices with no protection function (voltage relay, contactor) — fewer false warnings.

FixedA direct N under an RCD warns only when there are two or more such siblings.

ImprovedValidation button shows green 🟢 «All good» when no issues.

Export and print

AddedLabel generator: the standard module width of 18.5 mm, adaptive height, and rating and phase in a separate vertical strip.

ImprovedPDF BOM includes busbars (PE/N + comb busbars) in equipment specification + automatic table centering.

Site

ImprovedDark theme for dialogs; the newsletter banner remembers the current page.

AddedThe DBN V.2.5-23:2025 reference — 265 clauses with AI explanations and a direct link from the checks.

AddedBlog post «Voltage Drop in Cable».

Added«🆕 New» badge for blog articles updated in the last 30 days.

v1.5.0 — April 19, 2026

Editor

AddedRoles for input power sources — 8 types (grid, transformer, generator, inverter, UPS, solar, battery, other) with custom naming. Badges, color markers, dedicated BOM column, AI consultant integration.

AddedA light theme and its switch (phase 2). The toolbar stays dark in both themes.

AddedA universal bottom sheet for mobile windows with a drag handle, snap heights and keyboard awareness.

Improved1-0-1 switch — IEC 60947-3 / PUE 1.7 model based on real products. Added 4P variant for TT/IT.

ImprovedThe palette on a phone is a bottom sheet with an accordion by category.

AddedCompact form factor for 11 device types — 1-module variants (ETI KZS-1M, R 20-20, Hager ARM920U, Shelly Pro 1PM, etc.).

Added4P contactor in compact 2M form factor (ETI R 25-22).

FixedCross module with a three-phase parent without N: the N line now correctly runs from the N bus to the input side.

FixedOn an SPD the N line no longer crosses the green PE terminal.

ImprovedPhases are now spaced apart in the side channel for a three-phase wire bundle.

AddedN-combs — neutral distribution via DIN comb instead of individual wires.

AddedPhase combs automatically build the 1P/3P/1P+N/3P+N pattern according to the phase.

AddedMixed 1P/3P combs: phases are skipped between breakers of different types.

AddedA comb can be fed from a breaker on another rail.

AddedSplitting and merging combs from the context menu.

AddedN cascade: a comb can be fed from another comb, including one on another rail.

AddedUI in properties to add/remove a breaker from a comb.

AddedA device automatically leaves a comb if its parent is changed to an incompatible one.

ImprovedA continuous bar for mixed 1P/3P combs — no gaps between sections.

AddedNeutral route choice (via a bus or direct) with automatic detection.

ImprovedHierarchy section redesign — compact UI instead of 6 separate fields.

ImprovedUnique module names when adding from palette (AB, AB (2), AB (3)).

FixedCross module 1P+N: correct routing of the N wire.

AddedPhase selector (FC-1) — 3-phase input, 1-phase output with phase selection.

AddedCtrl + drag clones modules with all their parameters.

AddedCompact 1P+N (1 module) for MCB and RCBO — Hager MLN, Schneider iDPN.

AddedDeep search in the palette — by device parameters and fields.

Checks and calculations

FixedRemoved a false «3+ connections on a terminal» warning for the cross module.

Added11 new N-routing checks — N break, protection bypass, cyclic connections.

AddedTerminal overload check — 3+ connections on a single terminal.

Site

ImprovedAI consultant: fewer made-up answers, an FAQ mode and filtering of irrelevant questions.

v1.4.0 — April 12, 2026

Added3 new device types — contactor switch, 1-0-1 switch (QC), 3P indicator.

AddedContactor control circuit — A1/A2 terminals with full wire routing.

Added1-0-1 switch as manual ATS — two inputs with implementation analogous to ATS.

AddedSearch in device palette — by name, abbreviation, and full description.

AddedBlog for electricians — 5 practical articles: panel assembly, inverter, voltage relay, RCD, Zigbee.

AddedA table of contents in blog articles that highlights the active section while scrolling.

AddedNavigation in the landing header — Blog, Tools, PUE, Docs.

ImprovedPalette: a coloured stripe on the left, group abbreviations and counters.

ImprovedProperties panel: a new section structure (Main → Connection → Hierarchy → Control → Load).

AddedA new wire routing system: «∏» on the same rail, Z-shape between rails, C-shape between bottom terminals; crossings are spaced out automatically.

AddedWire length calculator — breakdown by phase, total length, installation margin, per-wire detail.

AddedManual correction expandable list — view each route override with individual reset.

ImprovedThe wiring panel is fully redesigned — sections ordered by how often they are used, hints in an accordion.

FixedManually corrected wires no longer "drop" when rail spacing changes.

v1.2.0 — March 29, 2026

Editor

AddedCross module — a new device type with wire routing and a per-phase limit.

AddedThree-phase combs — accurate rendering and per-phase load calculation.

ImprovedThe minimap can be resized (S/M/L/XL) by dragging and is easier to use on mobile.

FixedModule extension searches for nearest free slot instead of first.

AddedWire color standard — 4 palettes (IEC/DSTU, Soviet, NEC, Classic).

AddedRoom zones — 11 types with emoji icons on breakers.

FixedBusbars — automatic removal of MCB when parent changes.

AddedInterface state (zoom, sidebar, wire mode) is remembered.

AddedIndirect bus descendants highlighted with yellow dashes.

AddedA brief flash highlights a module when its row is clicked in «Terminal assignment».

ImprovedAuto-sync of bus terminals — dialog suggesting an increase.

ImprovedThe capacity bar under the rails animates on hover.

Checks and calculations

AddedAudit PUE — RCD selectivity, wet zone checks, appliance labeling.

ImprovedSimultaneity factor per IEC 61439-1 — depends on number of circuits.

FixedSelectivity — rating check for protective devices only.

Site

AddedPUE reference: 107 new clauses of chapter 7.

ImprovedPublic pages without redirect — /pue, /tools, /blog, /changelog accessible without registration.

AddedPUE Reference — 2559 clauses with AI explanations in plain language at /pue.

AddedPages for PUE sections and chapters with a search filter.

AddedCross-linking between AI consultant and PUE reference.

AddedAI consultant for PUE — a floating chat on all pages.

AddedPanel context in AI — sees configuration, phases, loads, and project validation errors.

AddedFormatted (markdown) text in AI replies.

AddedRequest limits for the AI chat, adjustable per user.

AddedClickable badges linking to PUE clauses in AI responses.

AddedInteractive shared view — clicking a breaker highlights its wires, clicking a bus highlights its devices.

AddedA minimap and a rail-spacing slider on the shared view page.

ImprovedA new site icon and PWA icons, and a shorter tab title.

v1.1.0 — March 22, 2026

Editor

AddedPE/N buses — 3 mounting zones (top, bottom, DIN rail) + side plates.

AddedDragging buses between zones with a preview of neighbours shifting and snapping.

AddedBuses on a DIN rail — vertical rendering and dragging between rails.

AddedSide buses — vertical PE/N strips at the side of the panel with L-shaped wire routing.

AddedN wires run hierarchically through the buses with orthogonal (Manhattan) routing.

AddedA separate N bus for each RCD, created automatically.

AddedWire labels on the diagram.

AddedCombs — a group of breakers joined by a copper bar. Input and output, types 1P/3P/1P+N/3P+N.

AddedContext menu for creating a busbar comb with auto-detected type.

AddedComb properties and 9 validation rules.

AddedNotifications at the bottom of the screen for validation errors and automatic changes.

AddedBusbar combs on the minimap — colored lines for navigation.

ImprovedA device is automatically removed from a comb if the comb becomes incompatible with it.

AddedDiamond handles on wires for adjusting the route in both directions.

AddedWire selection on click — selected wire highlights, rest dim.

AddedWire labels — identifier next to each connection (W001/A3:2).

AddedReset manual route — click on the selected wire.

AddedUndo/Redo for manual routes (Ctrl+Z / Ctrl+Y).

AddedSelecting several wires at once (Shift+click).

AddedTab/Shift+Tab navigation between wires with scroll to selected.

AddedMinimap for large panels with quick navigation.

ImprovedWires between breakers on the same DIN rail route around devices to the right — no longer pass through the body.

FixedX-diamond no longer jumps to the default position when dragging.

FixedManual routes automatically reset when moving a breaker.

AddedManual switch 1-0-2 — main/off/reserve power selector.

AddedDual ATS connection — main and reserve devices with automatic wire rendering.

AddedDiamond controls on C-shaped and straight vertical wires.

FixedATS 2P now L+N instead of two phases.

FixedWires to inverted breakers approach from below to the bottom terminal.

ImprovedC-shaped wire can be dragged left or right.

AddedWiring edit mode — Alt+W toggles open/close.

AddedConnection type 3P+N for AV.

FixedDiamonds display correctly when DIN rails are close together.

FixedUnused input of an inverted breaker shows a short dimmed segment.

ImprovedIncreased click area on diamonds.

AddedA horizontal handle (◆↔) for vertical wire segments.

AddedAuto-switch shape Z→∏ when near a connection point.

AddedColored diamonds match wire phase (L1/L2/L3/N/PE).

ImprovedSmooth snap-back of diamond on release.

FixedWire handle behaviour with inverted breakers.

AddedA separate neutral sub-bus for each RCD.

ImprovedThe Ukrainian RCD term in the interface was updated to the current one throughout (except the RCD calculator).

Checks and calculations

AddedWarning about the same device on both ATS inputs.

Export and print

AddedElectrical schematic (EPS) — separate page with IEC 60617 symbols.

AddedAutomatic tree layout of the diagram for a hierarchy of any depth.

AddedPrint branding — logo + QR code on all pages.

ImprovedPrint without browser headers/footers.

FixedFixed empty pages when printing labels and BOM.

FixedCorrect IEC symbol chain for MCB/RCD.

Site

AddedA blog with practical articles for electricians.

AddedA «Changelog» page (/changelog).

ImprovedEmail validation on signup — only verified providers.

ImprovedA live indicator of password requirements when signing up.

FixedCallout blocks in the blog: symmetric spacing and the icon on the same line as the text.

v1.0.0 — March 15, 2026

AddedImport/export projects in .eboard (JSON) format.

AddedDevice info tooltips in the palette plus a context menu (right click).

ImprovedProperties panel — a fully dark theme.

FixedKeyboard shortcuts on non-Latin layouts (UA/RU).

AddedSmart dragging of devices: insert into any position on the rail with neighbours shifting automatically.

AddedA preview of the final position before you release.

ImprovedDragging between rails now inserts (swapping places was removed).

Added7 new calculators — AWG, lighting, power, load audit, electricity cost, wire colours, IP ratings.

AddedCross-links between all 13 calculators.

AddedA calculator filter by category and breadcrumb navigation.

AddedPanel label generator — DIN-rail labels with phase colors and printing.

AddedPWA — offline mode and an install button.

AddedFAQ sections for all calculators.

AddedWire mode — switching between the schematic and the mounting view.

AddedViewing shared projects by link.

AddedA site preview image for links shared in social networks and messengers.

v0.1.0 — March 8, 2026

AddedPanel templates — 5 preset configurations for quick start.

AddedMobile adaptation — pinch zoom, long-press drag, a floating palette button and a two-row toolbar.

AddedCables: installation method, automatic section selection and voltage drop calculation.

ImprovedProperties panel and consumers drawer — a fully dark theme.

AddedValidation panel v2 — 9 modules, 22 rules, grouped by category.

AddedDedicated N bus for each 30 mA RCD group (automatic).

AddedLoad and phase balance calculation.

Added3-phase network support — TN-S, TN-C-S, TT, IT.

AddedDragging devices works with both mouse and touch.

AddedConsumers — manual add, presets, cos φ and inrush current calculation.

AddedColor-coded load indicator on each circuit breaker.

AddedAutosave in the browser and undo/redo (unlimited steps).

AddedN and PE buses on canvas with device connections.

AddedDevice palette with auto-grouping by type.

AddedFirst version: DIN rails, the panel editor and 22 device types.