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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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    Also the label reg i was thinking of is 514.11.1 it does say not capable of being isolated by a single device, and you could argue the 6A mcb does this, but then so does the main switch and cut out. I think the intention is that it warns of a possible danger of live parts if one of the fuses blows and the fan dont work. 

     




    The notice "shall be fixed in each position where there are live parts which are not capable of being isolated by a single device."


    The fan can be isolated by the single lighting M.C.B.


    or  the 3 pole fan isolator.


    Also there are no live parts accessible to cause danger. Everything is enclosed and/or insulated.


    So 514.11.1 does not apply.


    It might apply to say a night storage heater with a normal on peak heater build in as well as the off peak,  where there are two distinct supplies with two different supply switches.


    Z.


Reply
  • 0
     



    Also the label reg i was thinking of is 514.11.1 it does say not capable of being isolated by a single device, and you could argue the 6A mcb does this, but then so does the main switch and cut out. I think the intention is that it warns of a possible danger of live parts if one of the fuses blows and the fan dont work. 

     




    The notice "shall be fixed in each position where there are live parts which are not capable of being isolated by a single device."


    The fan can be isolated by the single lighting M.C.B.


    or  the 3 pole fan isolator.


    Also there are no live parts accessible to cause danger. Everything is enclosed and/or insulated.


    So 514.11.1 does not apply.


    It might apply to say a night storage heater with a normal on peak heater build in as well as the off peak,  where there are two distinct supplies with two different supply switches.


    Z.


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