In line fuse holder

[mhar]

Got some coastal apartments which have a mixture of downlights, pendants and 5A round pin wall plugs all controlled by conventional light switches and everything is switch fed. OCPD is a B10 mcb which if I derated it to a B6, would still be over the 5A rating of the sockets and plugs. All the 5A rated plugs used are unfused.
I am looking for small inline fuseholders for 3A 1362 fuses (or anything else suitable) which I can fit in the switch backboxes. Otherwise I will have to come out of the cu from the 10A mcb to an sfcu fused at 5A which, whilst easier, doesn't feel right. Or am I missing something?

 

[Pete999]

Not in a lighthouse is it?

No mate they only have 1 light and that's usually on the roof, and takes more than 5Amps

 

[westward10]

8th 1924
9th 1927

Knew you would remember

 

[westward10]

By the same thinking we couldn't have things like 13A socket outlets on a 32A breaker!

Except circuit protection is at the plug top.

 

[mhar]

Except circuit protection is at the plug top.

Which is partly my concern. The manufacturers are supplying a light complete with a 3A fuse to protect their device and cable, we then discard this and connect into a 10A supply.
Thanks for the replies

 

[Wilko]

Which is partly my concern. The manufacturers are supplying a light complete with a 3A fuse to protect their device and cable, we then discard this and connect into a 10A supply.
Thanks for the replies

Dumb question, sorry, but are you saying the light had a manufacturers 3A fuse which has now been removed ?

 

[mhar]

Yes. BS1362 plug which has to be removed to put on the unfused 5A plug. Therefore quite likely a .5mm cable being protected by a 10A ocpd

 

[westward10]

Yes. BS1362 plug which has to be removed to put on the unfused 5A plug. Therefore quite likely a .5mm cable being protected by a 10A ocpd

Are you missing something, do you seriously believe the cable is going to be subject to overcurrent conditions.

 

[Wilko]

Hi Westie - Overload current agreed no prob. But perhaps manufacturer's cable not sized to trip mcb under all fault currents, which may be why they put 3A fuse ?

 

[Wilko]

Using the adiabatic eqn and Wylex i2t data sheet for their 10A B type I get 0.5mm is good for about 1200A of fault current. This calc has a 12:12 warranty - 12minutes or 12reads

 

[westward10]

Hi Westie - Overload current agreed no prob. But perhaps manufacturer's cable not sized to trip mcb under all fault currents, which may be why they put 3A fuse ?

Yes is possible but the manufacturer has to fit a plug and for this country it is going to be a 13A plug. OP you could try the 5A plug from MK part no. 643WHI which comes with a 5A fuse but you could probably change it for a 3A. I would guess it is a BS646 fuse.

 

[DPG]

Yes is possible but the manufacturer has to fit a plug and for this country it is going to be a 13A plug. OP you could try the 5A plug from MK part no. 643WHI which comes with a 5A fuse but you could probably change it for a 3A. I would guess it is a BS646 fuse.

Now I like that - not seen them before. There's your answer then OP.

Daz

 

[DPG]

No mate they only have 1 light and that's usually on the roof, and takes more than 5Amps

You might be surprised there Pete.