IEC 60364-4-43 Overcurrent protection — translation

IEC 60364-4-43: overload (IB≤In≤Iz, I2≤1.45Iz), short-circuit protection, coordination.

🇷🇺 PUE — Rules for Electrical Installations (7th ed.)🕰️ PUE-6 — Rules for Electrical Installations (6th ed., 1985)🇺🇸 NEC — National Electrical Code (NFPA 70)🇪🇺 IEC 60364 / HD 60364 (EU national codes)🌎 NOM-001-SEDE, NBR 5410, AEA 90364, RETIE, NCh 4, CNE 🇨🇳 GB 50054, GB 50303, JGJ 16, GB/T 16895 (IEC 60364)🇮🇳 IS 732

Document

Document	IEC 60364-4-43 Overcurrent protection
Edition	2015
Status	Current (IEC 60364-4-43)
Issued by	IEC
Applies to	Overcurrent protection: overload and short circuit, coordination

Document structure

№	Chapter / section
431	General
433	Overload protection
434	Short-circuit protection
435	Coordination

IEC 60364-4-41 Protection against electric shock IEC 60364-5-52 Wiring systems IEC 60364-5-53 Switchgear and surge protection IEC 60364-7-701 Rooms with baths and showers IEC 60364-4-43 Overcurrent protection IEC 60364-6 Verification of installations IEC 62305 Lightning protection (parts 1–4)IEC 60364-7-710 Medical locations IEC 60364-5-54 Earthing and protective conductors IEC 60364-7-702 Pools and fountains BS 7671 UK Wiring Regulations AS/NZS 3000 Wiring Rules (Australia/NZ)

Overload (433)

433.1 IB ≤ In ≤ Iz and I2 ≤ 1.45 × Iz.

Short circuit (434)

434.1 SC protection where fault current may exceed ampacity; 434.5.2 breaking capacity ≥ prospective fault current.

Coordination (435)

Combined devices (MCB) coordinate automatically; separate devices — verify characteristics.

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