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IEC
IEC 60364-4-41 · Edition 2005+A1:2017

§411.1 Protective measures against electric shock — scope of §411 EB SUMMARY

§411 establishes **automatic disconnection of supply** (ADS) as the primary protective measure against electric shock and applies to most low-voltage installations within IEC 60364 Part 4-41. Unlike §410, which provides a general framework for shock protection, §411 integrates **basic protection** (prevention of direct contact — insulation, barriers, enclosures) with **fault protection** (automatic disconnection upon a fault to exposed conductive parts) into a single coordinated measure. Alternative protective measures under §412 (double or reinforced insulation), §413 (electrical separation), and §414 (SELV/PELV) apply only in special cases. §411 covers all earthing systems: §411.2 — definitions; §411.3 — general requirements with threshold U_L = 50 V AC (120 V DC); §411.4 — TN systems; §411.5 — TT systems; §411.6 — IT systems with insulation monitoring; §411.7 — functional extra-low voltage FELV; §411.8 — additional conditions for special installations. Additional protection per §415 — §415.1 (RCD ≤30 mA for general-purpose sockets, portable equipment, and bathrooms) and §415.2 (supplementary protective equipotential bonding) — applies on top of §411, not as a replacement.
EB-authored summary for design convenience — NOT normative IEC text. Official standard IEC 60364-4-41:2005+A1:2017 available at webstore.iec.ch →.
💡 Explain in plain words
In plain words
AI-generated — may contain inaccuracies

§411 — basic section on protection of persons against electric shock in low-voltage installations up to 1000 V. The main idea: the primary protective measure is automatic disconnection of supply (ADS), i.e., rapid disconnection of the circuit by a protective device if a dangerous voltage appears on the equipment enclosure due to a fault. The measure combines two levels: under normal conditions, prevent contact with live parts (insulation, enclosures, barriers), and in case of a fault to the enclosure, disconnect in time. Alternatives (double insulation, isolating transformer, SELV/PELV) are used only in special situations. For an electrician in practice, this means: the safety of a typical panel relies on correct earthing together with circuit breakers and RCDs that manage to disconnect the circuit within the standardized time.

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