3 wires into 2 !!!! Ask questions and find answers to many subjects relating to electrics and electrical work

[harley70]

:roll: I am installing an outside security light and am about to wire it into the junction box outside, when i opened the junction box there were only a red and a black wire, I am confused as how i would wire the 3 core cable into the junction box safely.
Many thanx
Matt

[ericmark]

There are Class II and Class I equipment with Class II often called double insulated no earth is required and there is a little double square to show it is Class II and I would guess the old lamp was of this type.
Class I always requires an earth.
So either you need to rewire your junction box or you need to change the lamp for a double insulated type.
You may also be moving into Part P there are enough links on here and that's up to you to work out.
Eric

[harley70]

Hi,
Don't think i explained myself clearly, Its not a junction box i'm talking about, I have a terminal block inside a plastic box fixed to the wall and there are a red and a black wire going into the trerminal block, can i wire my 3 core cable into this, and would it be safe ??

[ericmark]

Simple answer "No"
I was trying to explain there may be ways around the problem.
Sorry I know it's not the answer you wanted.
Eric