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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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    Agree, in general avoid 3 amp circuits due to concerns about tripping on inrush currents.

    I would only consider a 3 amp circuit in special circumstances, such as extreme length to lamps in a distant outbuilding or at end of a large garden. Or possibly when it is desired to limit misuse such as connecting appliances to lamp holders, or to limit loading on a small generator or inverter.

    To a very good apoximattion, the maximum circuit length would be twice that for a 6 amp MCB.
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  • 0
    Agree, in general avoid 3 amp circuits due to concerns about tripping on inrush currents.

    I would only consider a 3 amp circuit in special circumstances, such as extreme length to lamps in a distant outbuilding or at end of a large garden. Or possibly when it is desired to limit misuse such as connecting appliances to lamp holders, or to limit loading on a small generator or inverter.

    To a very good apoximattion, the maximum circuit length would be twice that for a 6 amp MCB.
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