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32A single and 3 phase supplies feeding catering heat lamps via grid fuse modules.

hertzal123

I have been asked wire 300W heat lamps that are mounted over restaurant kitchen hot plates.

The loading of the lamps can be up to 6kw and will include dimmer switches for groups of lamps.

I was planning to supply the lamps via MK grid fuse modules with 13A BS1362 fuses and 2M of 4mm  3 core or 5 core

ho7.Assuming the the fuses will protect the lighting wiring.I was wondering if the grid fuses are suitable in this situation

in particular ,with the 3 phase 32A supplies?Thanks for any advice.

                                                                                              Happy new year,

                                                                                                             Hz

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    I see no particular problem using BS 1362 fuses on single phase circuits derived from a 3-phase supply - that's how about 95% of them are used anyway when you consider the DNO side of things as well.

    I suspect heat lamps are basically filament lamps though - very similar in principle to the old domestic GLS lamps - and they had a very definite habit of blowing fuses when the lamp came to the end of its life (when the filament broke, a section of filament with definite resistance was momentarily replaced by an arc/plasma with much lower resistance). So there might be an advantage of using something resettable for local overcurrent protection. DIN rail mounted MCBs aren't your only option though - you can get smaller circuit breakers intended to be built into appliances too.

       - Andy.

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  • 0

    I see no particular problem using BS 1362 fuses on single phase circuits derived from a 3-phase supply - that's how about 95% of them are used anyway when you consider the DNO side of things as well.

    I suspect heat lamps are basically filament lamps though - very similar in principle to the old domestic GLS lamps - and they had a very definite habit of blowing fuses when the lamp came to the end of its life (when the filament broke, a section of filament with definite resistance was momentarily replaced by an arc/plasma with much lower resistance). So there might be an advantage of using something resettable for local overcurrent protection. DIN rail mounted MCBs aren't your only option though - you can get smaller circuit breakers intended to be built into appliances too.

       - Andy.

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