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Lights Supplied by 30 Amp Ring Final. B.S. 3036 Fuse.

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HellOOOoooo All,


I came across a strange one today. I went to change a faulty touch dimmer switch for an ordinary light switch. I discovered that the two lights controlled by the switch did not originate at the lighting circuit, but from a 30 Amp wire fused ring final. The supply was connected to an old metal double socket box below the light switch, in an added conservatory, with a blank plate over it. I can not add a fused connection unit as the box is a double socket box. The blank plate is covered by a small easily removed panel convector heater. I was considering installing an inline fuse holder in the double socket box for the lighting circuit. The lamps are low energy types so overloading is very unlikely, but faults may occur.


Thoughts please.


Z.
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  • 0
    ebee:

    I would certainly not be very comfortable fitting two distinct fuses/breakers to a domestic fan supply. A "fusing down" before the isolator/fan switch split to say the light before the wiring visits the fan would be my way. I would (wrongly) not be over-concerned about not having a 3A fuse to the fan on a 6A B type MCB lighting circuit although it does contravene some manufacturers instructions.


    On a domestic type circuit, although the incompetant should leave well alone, we all know that often they do not.

    In a , hopefully well controlled, commercial setting we might not be as concerned. Although that lack of concern might be a bit misguided .


    There is no risk as the fan can be completely isolated via the 3 pole fan isolating switch which is made for this purpose. We have three separate fuses in 3 phase supplies to machines and they create no safety problems.


    Z.


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  • 0
    ebee:

    I would certainly not be very comfortable fitting two distinct fuses/breakers to a domestic fan supply. A "fusing down" before the isolator/fan switch split to say the light before the wiring visits the fan would be my way. I would (wrongly) not be over-concerned about not having a 3A fuse to the fan on a 6A B type MCB lighting circuit although it does contravene some manufacturers instructions.


    On a domestic type circuit, although the incompetant should leave well alone, we all know that often they do not.

    In a , hopefully well controlled, commercial setting we might not be as concerned. Although that lack of concern might be a bit misguided .


    There is no risk as the fan can be completely isolated via the 3 pole fan isolating switch which is made for this purpose. We have three separate fuses in 3 phase supplies to machines and they create no safety problems.


    Z.


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