cut unknown wire in loft. what to do?

[webbo1]

i think i nearly just killed myself. i have just cut a wire in my loft and in a result tripped out all the upstairs lighting in my house.

Can i fix this by connecting it back together with a terminal block.

The wire Contains 4 wires.

1 brown live
1 black neutral
1 earth
1 grey ?

im not sure what the grey wire is for?

so basically i need advice if this will be ok all connected back together with a terminal choc block? or do i need to fix a new wire up there?

what amp choc bloc?

do i need to cover the terminal block with anything else light insulation tape etc as it is in the loft amongst fiber glass insulation?


im 23 years old i did a 1 year course in electrical insulation, very basic, learnt how to wire lights, sockets etc never come across this wire before but thats probabily because i dropped out to persue another career but i feel confident i can fix this with you expert advice. thanks.

ps - i know im a lucky boy thank god the fuse tripped

 

[Monkeh]

That should be blue, not black. Anyway, it's most likely for a bathroom extractor fan, or two-way lighting. Rejoining it should be fine, you'll need to enclosure it something like this: http://www.tlc-direct.co.uk/Products/CHOCBOX.html

If it was on your lighting circuit, use a 15A strip.

 

[Lectrician]

Why should it be blue? It sounds like standard three core and earth to me - brown black grey.

The black must not be assumed to be the neutral - it could just as easily (and more likely) be the grey.

Could be a fan, could be two way switching, could be anything.

 

[Monkeh]

Why should it be blue? It sounds like standard three core and earth to me - brown black grey.

The black must not be assumed to be the neutral - it could just as easily (and more likely) be the grey.

Could be a fan, could be two way switching, could be anything.

Err, yes, sorry. Not entirely here.

Whatever it is, joining it should be fine.

 

[webbo1]

great il get down to b&q tomorrow get a 15a connector and connector box. thanks for the info. still cant belive how lucky iv been!

 

[Lectrician]

Just buy a standard 20amp joint box.

 

[webbo1]

which is better/safer. dont want the loft burning down the house 2+ years down the line

 

[big-all]

as an aside
if its to board your loft then it needs to be accessible like any other screw join

 

[webbo1]

its not goin under any of the boards

 

[pte440]

Why did you cut the wire? i am very nosy