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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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    Indeed - the circuit goes all the way back to the sub-station after all. So your one of your circuits is protected by one fuse, a B6, maybe a submain protective device, the DNO's fuse etc (perhaps some of those devices rely on an upstream device for backup protection). While the other circuit is protected a different fuse, then the same B6 etc. Hence the two circuits aren't entirely protected by the same devices.

       - Andy.


    We are talking about a simple domestic situation. The fan L and switched L both originate from one B6 or B10. There are not two separate supplies. I am only concerned with matters within the installation not without it, such as the final circuit and not beyond. 110.2 (1).


    Z.


     


Reply
  • 0


    Indeed - the circuit goes all the way back to the sub-station after all. So your one of your circuits is protected by one fuse, a B6, maybe a submain protective device, the DNO's fuse etc (perhaps some of those devices rely on an upstream device for backup protection). While the other circuit is protected a different fuse, then the same B6 etc. Hence the two circuits aren't entirely protected by the same devices.

       - Andy.


    We are talking about a simple domestic situation. The fan L and switched L both originate from one B6 or B10. There are not two separate supplies. I am only concerned with matters within the installation not without it, such as the final circuit and not beyond. 110.2 (1).


    Z.


     


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