LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-43: PROTECTION FOR SAFETY - PROTECTION AGAINST OVERCURRENT
International Electrotechnical Committee
FOREWORD
43 Protection against overcurrent
430.1 Scope
430.2 Normative references
430.3 General requirements
431 Requirements according to the nature of the circuits
431.1 Protection of line conductors
431.2 Protection of the neutral conductor
431.3 Disconnection and reconnection of the neutral conductor
in multi-phase systems
432 Nature of protective devices
432.1 Devices providing protection against both overload
current and short-circuit current
432.2 Devices ensuring protection against overload current only
432.3 Devices ensuring protection against short-circuit
current only
432.4 Characteristics of protective devices
433 Protection against overload current
433.1 Coordination between conductors and overload protective
devices
433.2 Position of devices for overload protection
433.3 Omission of devices for protection against overload
433.4 Overload protection of conductors in parallel
434 Protection against short-circuit currents
434.1 Determination of prospective short-circuit currents
434.2 Position of devices for short-circuit protection
434.3 Omission of devices for protection against short-circuit
434.4 Short-circuit protection of conductors in parallel
434.5 Characteristics of short-circuit protective devices
435 Coordination of overload and short-circuit protection
435.1 Protection afforded by one device
435.2 Protection afforded by separate devices
436 Limitation of overcurrent by characteristics of supply
Annex A (informative) Protection of conductors in parallel against
overcurrent
Annex B (informative) Conditions 1 and 2 of 433.1
Annex C (informative) Position or omission of devices for
overload protection
Annex D (informative) Position or omission of devices for
short-circuit protection
Annex E (informative) List of notes concerning certain countries
Bibliography
Describes requirements for the protection of live conductors from the effects of overcurrents.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 64 |
| Supersedes |
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