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Overload protection

MrJack96

If you have a 32 amp feeder feeding 4x 6 amps circuits feed in parallel is there something in the regs that states the cable between the 32amp fuses dosmt have to be rated for 32 amps as long as It meets certain condition? my thinking was as its limited to 6 amps upstream it’s unlikely to get overloaded.

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    And regarding the specific case of the lighting circuit in a substation, the last one in which I was involved had a 32 amp fuse holder, with 32 amp fuse, mounted very close to the busbar with only a couple of inches of wire between the busbar and fuse holder. This rendered a fault almost impossible as no earthed metal or other phases were within reach of the very short wire.

    A length of double insulated wire then went to a 10 amp fuse for the lights and a 20 amp fuse for the power socket. These fuses could be easily changed if needed. The 32 amp fuse was uncomfortably close to the live busbar, but was likely to last the life of the substation.

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    And regarding the specific case of the lighting circuit in a substation, the last one in which I was involved had a 32 amp fuse holder, with 32 amp fuse, mounted very close to the busbar with only a couple of inches of wire between the busbar and fuse holder. This rendered a fault almost impossible as no earthed metal or other phases were within reach of the very short wire.

    A length of double insulated wire then went to a 10 amp fuse for the lights and a 20 amp fuse for the power socket. These fuses could be easily changed if needed. The 32 amp fuse was uncomfortably close to the live busbar, but was likely to last the life of the substation.

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