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OSG Standard Circuits - 3A lighting

Former Community Member
Former Community Member
As we are all using led lamps / fittings now it seems this should be a standard circuit.

3A MCB with 1.0/1.0 cable


Lighting circuits used to be based on 100w incandescent lamp / room at 1800 lumens which is equiv to 20w led.

What are the figures for max distance for a 3A type B using 1.0/1.0 as an addition in table 7.1 page 66 in OSG?
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    I agree - we have enough trouble with B6 MCBs and switch-on surges (a few years ago there was a drift towards going 10A for lighting circuits). When power returns after a power cut, every light that had been in use when the power went off will start simultaneously and very likely trip a B3.

       - Andy.
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    I agree - we have enough trouble with B6 MCBs and switch-on surges (a few years ago there was a drift towards going 10A for lighting circuits). When power returns after a power cut, every light that had been in use when the power went off will start simultaneously and very likely trip a B3.

       - Andy.
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