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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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  • 0
    Gentlemen, this is not a "borrowed" neutral by any reasonable consideration. Even if you have installed with two fuses, presumably both phase wires and the neutral to the fan are in the same cable? This is not two final circuits, it is only one feeding one appliance. This is a case where correct installation should be followed, one cable to the fan, the phase and switched phase from the switch along with the corresponding circuit neutral (or all together from the light if you want to follow that path of looping in). I really don't see why you want two fuses either, one feeding both fan and light is the obvious route. I really don't understand why the instructions want a fan isolator either, but then they are obviously written by the well-known uninformed author who plagues all the "manufacturers instructions" written to the 16th edition. 521.8.2 does not apply, because the ring is NOT a submain to another DB however many fuses you try to fit.
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  • 0
    Gentlemen, this is not a "borrowed" neutral by any reasonable consideration. Even if you have installed with two fuses, presumably both phase wires and the neutral to the fan are in the same cable? This is not two final circuits, it is only one feeding one appliance. This is a case where correct installation should be followed, one cable to the fan, the phase and switched phase from the switch along with the corresponding circuit neutral (or all together from the light if you want to follow that path of looping in). I really don't see why you want two fuses either, one feeding both fan and light is the obvious route. I really don't understand why the instructions want a fan isolator either, but then they are obviously written by the well-known uninformed author who plagues all the "manufacturers instructions" written to the 16th edition. 521.8.2 does not apply, because the ring is NOT a submain to another DB however many fuses you try to fit.
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