Published: 2 July 2018
Category: White Papers and technical guides
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Overload protection of an RCCB or switch in an LV assembly to BS EN 61439-3
BS 7671: 2018 IET Wiring Regulations 18th Edition specifies requirements for overload protection of an RCCB or switch in an LV assembly, Regulations 536.4.3.2, 536.4.5 and 536.4.202 refer.
BEAMA
Overload protection of an RCCB or switch in an LV assembly to BS EN 61439-3
Published: 2 July 2018 · Category: White Papers and technical guides
BS 7671: 2018 IET Wiring Regulations 18th Edition specifies requirements for overload protection of an RCCB or switch in an LV assembly, Regulations 536.4.3.2, 536.4.5 and 536.4.202 refer.
From this document
Bringing power to life. Overload protection of an RCCB or switch in an LV assembly to BS EN 61439-3 BS 7671: 2018 IET Wiring Regulations 18th Edition specifies requirements for overload protection of an RCCB or switch in an LV assembly, Regulations 536.4.3.2, 536.4.5 and 536.4.202 refer. This bulletin provides BEAMA member’s guidance for RCCB and switch overload protection however; individual manufacturer’s instructions must be followed, particularly the rated current of the related assembly circuit Inc (A) which must be stated in the documentation supplied with the LV assembly e.g. distribution board or consumer unit. The rated current in the assembly circuit Inc (A) of the switch or RCCB shall be derived from one of the following two methods in diagrams 1 and 2. In both methods, circuits shall be designed so that a small overload of long duration is unlikely to occur. 1. Be greater than or equal to the sum of the rated current of all outgoing circuit OCPDs1 e.g. MCBs, fuses; see diagram 1. Diagram 1 Inc2 I n1 or In 3 + I n4 + I n5 + In6 + In7 Inc2 or In3 I n4 6 5 4 3 Inc2 I n5 or In 1 or Inc2 I n6 In7 In3 I n4 I n5 = Circuit-breaker Inc2 = Rated current of a circuit (A) stated by the assembly manufacturer which may be lower than the unenclosed rated current marked on the device (switch disconnector or RCCB) due to grouping & internal enclosure temperature etc. In 1 = Fuse Supplied from upstream 100 A BS 88-3 or BS 1361 cut-out supply fuse = Isolating switch / disconnector...
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