IEC 60364-5-52 Wiring systems — translation

Clause-by-clause translation of IEC 60364-5-52: wiring types, minimum sections 1.5/2.5 mm², voltage drop (525), connections (526).

Document

Document	IEC 60364-5-52 Wiring systems
Edition	2009 (в ред. 2017)
Status	Current (IEC 60364-5-52)
Issued by	IEC
Applies to	Wiring systems, conductor sizing, voltage drop

Document structure

№	Chapter / section
520	General
521	Wiring system types
523	Ampacity
524	Minimum cross-sections
525	Voltage drop
526	Connections

General (520–521)

Wiring system types per tables 52.1–52.8: surface, concealed, underground.

Ampacity (523)

Ampacity by installation method (C — in wall conduit, D — in ground, E — in air), ambient temperature, grouping. Sizes per IEC 60228.

Minimum sections (524)

Power and lighting: 1.5 mm²; control circuits: 0.5 mm².

Voltage drop (525)

≤ 4% for lighting, 8% for other circuits (recommended); national codes may tighten (BS 7671: 3/5%).

Connections (526)

Accessible for inspection, mechanically sound, insulation equal to the conductors; no hidden splices without access.

Data is for reference. Final design decisions must follow current regulations and a qualified engineer.
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