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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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    wallywombat:
    Zoomup:

    It is not always possible to easily fuse down before a bathroom or shower room light. I thought that your previous question was about to trick me. 521.8.2 does not apply, as I am only dealing with ONE final circuit, that of the lighting circuit feeding a single timer extractor fan.  No probs. here.




    I think the argument here is that by having separate fuses on the L and SL you have effectively created two final circuits but with a single device connected to both circuits. Which creates all sorts of potential problems. For example even with a fuse removed, the load side of the fuse holder may still be live.




    The fuse holders are all insulated grid type in a suitable insulated enclosure. There is no shock risk as the terminals are recessed.


    Z. 


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  • 0
    wallywombat:
    Zoomup:

    It is not always possible to easily fuse down before a bathroom or shower room light. I thought that your previous question was about to trick me. 521.8.2 does not apply, as I am only dealing with ONE final circuit, that of the lighting circuit feeding a single timer extractor fan.  No probs. here.




    I think the argument here is that by having separate fuses on the L and SL you have effectively created two final circuits but with a single device connected to both circuits. Which creates all sorts of potential problems. For example even with a fuse removed, the load side of the fuse holder may still be live.




    The fuse holders are all insulated grid type in a suitable insulated enclosure. There is no shock risk as the terminals are recessed.


    Z. 


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