• Welcome to the new forum. We're now hosted on ElectriciansForums.net rather than ElectriciansForums.co.uk - Chat about the forum upgrade by CLICKING HERE

Welcome to our Electrical Forum - We started out providing electrical advice just for the UK - But now we have specific advice for the USA too! - Register for free and share American Electrical Advice.

Discuss Outside light in the Electrical Forum area at ElectriciansForums.net

Not open for further replies.


EF Member
A collegue at work has asked about having a PIR light added. Not sure if im allowed to do it but said that i would have a look into it. The Consumer unit has no RCD and is the old wylex unit that is found in so many authority houses (meteral i think / skelton type)

my thoughts would be to take power from existing power circuit to FCU, drill through wall and run 1.5mm black flex in 25mm pvc conduit to light.

Will the light require RCD protection?


Scouser and Proud of It
Respected Member
the light won't need RCD protection. the cable would if buried < 50mm deep in a wall. if you can fit your FCU alongside a socket, then drill through the back of the FCU through the wall, then no RCD is required. fit a 3A fuse. the black flex can be clipped or in conduit. if in conduit, you will have problems with cable entry in light fitting unless you fit adaptable boc to conduit, then stuffing gland the flex out to the light. this job would not be classed as notifiable, but you will need to complete a MEWIC. and measure Zs etc. for the circuit you have modified. don't forget that you have to ensure earthing and bonding is in place and adequate.


I would take the supply from a nearby socket into an RCD fused switch ( make sure fuse is 3amp rated). Then outside to PIR light
If your not qualified to do it, then get a qualified electrician in to carry out the work, just in case you end up hurting yourself.

Not trying to be rude or anything, just helpful advise.

Best regards,
Not open for further replies.

Electrician Talk

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Electrical 2 Go - Electrical Supplier and Electrical Wholesalers
Electrical Insurance