Switched fuse spur

[buildersbutt]

Hi all, belong to a club which is Local councill owned but leased out, they have asked me to put up a dart board under a lamp on the wall, but the lamp is to low. I have removed the lamp but in doing so discoverd that it's on a switched spur off the ring main, now I know in the past this was done a lot, but am I right in saying that if this light is moved or the cable extended to move the light higher I will be responsible for leaving the spur, as it's not legal today. I am not a qualified electrician, just a retired builder. Thanks for your time.

 

[riveralt]

Hi all, belong to a club which is Local councill owned but leased out, they have asked me to put up a dart board under a lamp on the wall, but the lamp is to low.

Lower the floor

I have removed the lamp but in doing so discoverd that it's on a switched spur off the ring main, now I know in the past this was done a lot, but am I right in saying that if this light is moved or the cable extended to move the light higher I will be responsible for leaving the spur, as it's not legal today.

No you can have a single spur of the ring final circuit but not more than one without incorporating an FCU.
How is the lamp wired to the circuit? Via a 3Amp plug?

 

[buildersbutt]

It is connected staight into switched spur with a 5amp fuse.

 

[riveralt]

It is connected staight into switched spur with a 5amp fuse.

Do you mean a fused connection unit like this?
http://www.screwfix.com/p/mk-13a-dp-fcu/29775
or a similar one with a switch like this.
http://www.screwfix.com/p/mk-13a-dp-sw-fcu/13479
If either is correct then that is okay - though a 3 amp fuse may be more appropriate unless the light is more than 690w.
Should also be 2.5mm2 T&E from the supply and at least 1mm2 T&E to the load side.

 

[buildersbutt]

Yes it's similar to the second one with the switch, thanks for your input and time.

 

[riveralt]

Yes it's similar to the second one with the switch,

Then it would appear to have been designed and installed (still put a 3Amp fuse in) wiithin current regulations.

 

[EFLImpudence]

though a 3 amp fuse may be more appropriate unless the light is more than 690w.

Depends on the cable.

 

[riveralt]

though a 3 amp fuse may be more appropriate unless the light is more than 690w.

Depends on the cable.

 

[EFLImpudence]

though a 3 amp fuse may be more appropriate unless the light is more than 690w.

Depends on the cable.

The fuse is there to protect the cable.

If the cable is capable of carrying 6A (or more) then a 5A fuse is satisfactory.

 

[riveralt]

there to protect the cable.

Indeed but.

If the cable is capable of carrying 6A (or more) then a 5A fuse is satisfactory.

Following that logic when using 1mm2 cable clipped direct we should use a 13 Amp fuse!
Nah, I was always taught to use the smallest fuse and still standby my advice regarding a 3Amp fuse for this particular dart board light. Same cable bigger light might use a 5Amp; - but it would have to be a bloody big light.

 

[RF Lighting]

I'd use a 3A fuse even if its wired in 95mm² tri rated.

 

[EFLImpudence]

there to protect the cable.

Indeed but.

If the cable is capable of carrying 6A (or more) then a 5A fuse is satisfactory.

Following that logic when using 1mm2 cable clipped direct we should use a 13 Amp fuse!

It's not logic. You could. That's how it works.

OP will think it was installed incorrectly but it's fine.

Nah, I was always taught to use the smallest fuse and still standby my advice regarding a 3Amp fuse for this particular dart board light.

500mA fuse then.

 

[riveralt]

500mA fuse then.

No tried them, they don't half rattle about in the jaws of fcu fuse holder - but do create a pleasant odour when energised.

 

[ban-all-sheds]

No tried them, they don't half rattle about in the jaws of fcu fuse holder

You need to wrap them in aluminium foil to make them bigger.

 

[Alarm]

Why fuc about use a nail.