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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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    Alan Capon:
    Zoomup:

    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. . . 


    No, but using the definitions in BS7671, being fed from a single protective device makes it one circuit. Your two fuses feeding the fan makes it two circuits. 


    Regards,


    Alan. 




    I can see no danger with the current obvious simple easily understood arrangement, and having two fuses and claiming two circuits from one single M.C.B. is illogical. Which reg. are you referring to?


    In a domestic situation at the front door, if there is a three gang light switch with lighting supplied over three separate circuits from three separate M.C.B.s, , would you affix a warning notice advising so? I have never seen such myself.


    Z.


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  • 0
    Alan Capon:
    Zoomup:

    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. . . 


    No, but using the definitions in BS7671, being fed from a single protective device makes it one circuit. Your two fuses feeding the fan makes it two circuits. 


    Regards,


    Alan. 




    I can see no danger with the current obvious simple easily understood arrangement, and having two fuses and claiming two circuits from one single M.C.B. is illogical. Which reg. are you referring to?


    In a domestic situation at the front door, if there is a three gang light switch with lighting supplied over three separate circuits from three separate M.C.B.s, , would you affix a warning notice advising so? I have never seen such myself.


    Z.


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