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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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    From the point of view of a 3A fuse being there to limit the amount of current availble to start a fire (presuming we beleive the manufacturers) then maybe having two 3A supplies to the same smouldering box rather defeats the intention (depening on how the perhaps charred innards allow current to flow from both L and SL under the wrong conditions) - as a worst case it might be thought that two 3A supplies might be no better than a single 6A supply...

     


    I have not read the manufacturer's reasons for requiring a 3 Amp fuse related to fire prevention, but I imagine that an embedded thermal cut out in the motor windings would be better suited to prevent a dangerous overheat of the motor and associated fire risk. Perhaps the 3 Amp fuse is to protect the fan's internal wiring. Fans with an integral 250/500mA or so on board ceramic fuse will be safer.


    Z.

     


Reply
  • 0


    From the point of view of a 3A fuse being there to limit the amount of current availble to start a fire (presuming we beleive the manufacturers) then maybe having two 3A supplies to the same smouldering box rather defeats the intention (depening on how the perhaps charred innards allow current to flow from both L and SL under the wrong conditions) - as a worst case it might be thought that two 3A supplies might be no better than a single 6A supply...

     


    I have not read the manufacturer's reasons for requiring a 3 Amp fuse related to fire prevention, but I imagine that an embedded thermal cut out in the motor windings would be better suited to prevent a dangerous overheat of the motor and associated fire risk. Perhaps the 3 Amp fuse is to protect the fan's internal wiring. Fans with an integral 250/500mA or so on board ceramic fuse will be safer.


    Z.

     


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