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

Zoomup
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
    Alan Capon:
    Zoomup:

    We are talking about a simple domestic situation. The fan L and switched L both originate from one B6 or B10. . . 


    As you have two fuses supplying your fan via its supply cable, you have dual supplies to the unit. The definition of a “circuit” will apply to each of your fuses. This would be considered dangerous in a commercial environment as it would not be expected, and would be labelled as being fed from two supplies. In a domestic environment it is equally dangerous, perhaps more so. It should be labelled as having dual supplies, or fed from a single fuse located before the light & switch as others have said. 


    Regards,


    Alan. 




    It is no more dangerous than if you assume two supplies feeding a three plate ceiling rose wired with a permanent L and a switched L. We don't label them with a warning label. Obviously circuit labels detailing items is a good thing which I adhere to. The 3 pole fan isolator totally disconnects the supplies to the fan if maintenance is required. Safety is maintained. And any sparks will check before touching potentially conducting live parts. Where is the risk? 462.2


    Z.


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  • 0
    Alan Capon:
    Zoomup:

    We are talking about a simple domestic situation. The fan L and switched L both originate from one B6 or B10. . . 


    As you have two fuses supplying your fan via its supply cable, you have dual supplies to the unit. The definition of a “circuit” will apply to each of your fuses. This would be considered dangerous in a commercial environment as it would not be expected, and would be labelled as being fed from two supplies. In a domestic environment it is equally dangerous, perhaps more so. It should be labelled as having dual supplies, or fed from a single fuse located before the light & switch as others have said. 


    Regards,


    Alan. 




    It is no more dangerous than if you assume two supplies feeding a three plate ceiling rose wired with a permanent L and a switched L. We don't label them with a warning label. Obviously circuit labels detailing items is a good thing which I adhere to. The 3 pole fan isolator totally disconnects the supplies to the fan if maintenance is required. Safety is maintained. And any sparks will check before touching potentially conducting live parts. Where is the risk? 462.2


    Z.


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