Wire Colour

Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
Hi

I have just lengthened the live and neutral wires to a ceiling rose and noticed that the blue wire I used was slightly darker in colour to the one I replaced. Can someone please tell me if the rating will be the same, will it be ok for the job, or should I replace with like for like colour.

Thanks in advance :confused:
 
Sponsored Links
Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
Another question....... There was no earth wire from the lighting circuit(in the loft) to the ceiling rose, should there be? The new light fitting is all plastic if that makes a difference.

cheers
 
Sponsored Links
Joined
8 Jul 2006
Messages
704
Reaction score
11
Location
Yorkshire
Country
United Kingdom
Is there any earth core in any cables on your lighting circuit?

if not it suggests old wiring. pre 1967 i think. the earth might have been chopped back to the sheath.

you can only fit plastic fittings and switches where no earth core exists.
 
Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
Hi industryspark, there is an earth running round the lighting circuit but it stops at a junction (white block)and blue and brown run down to the ceiling rose.

Cheers
 
Joined
2 Jun 2005
Messages
14,841
Reaction score
477
Location
Cumbria
Country
United Kingdom
Sounds like the wire wasn't long enough so it was extended (using flex??)? What do you mean by white block, chock block? Is this in a suitable enclosure?
 
Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
Hi
The white block..... Is a block connector one wire in one side, screwed in place and one out the other side, except the earth.
 
Joined
2 Jun 2005
Messages
14,841
Reaction score
477
Location
Cumbria
Country
United Kingdom
Yup, sounds like the wire was too short, is there access to above? If so then you may install a junction box. The earth in an ideal world will be continued through using a twin and earth cable. This means the earth wire is present should you ever need to use a metal fitting in the future. If the earth wire is not required, sleeve it and terminate it into a piece of chock block.
 
Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
The earth is on its own, it is not in the same sleeving as the other wires it is in yellow and green sleeving.
I can see what you mean it is there if required... Oh dear, the light fitting before this one was metal and not earthed.


I have another question... while your on. What is the thinnest earth wire available, the reason being I have a reel of earth wire (for supplementary bonding) and I don't know the thickness (label has come off) as as I understand it you need at least 4mm earth to sup bond. Any idea how to measure the thickness?

Thanks
 
Joined
28 Mar 2004
Messages
9,883
Reaction score
445
Country
United Kingdom
cables are measured by the cross sectional area.

if you have a good caliper or a micrometer you can measure each strands diameter and from that calculate its cross sectional area and from that the CSA of the cable as a whole

you could also measure the diameter of the whole bunch but that may not be accurate enough to distinguish between the sizes (due to air gaps non-roundness etc).

another way is to take a small peice to the DIY store and compare it end to end with the cables on the shelves there.

supplementry bonding must be at least 4mm unless it is either part of a cable (where presumablly you would notice if it was inadvertantly damaged) or protected by conduit (trouble with this is what to do at the ends leading to the clamps).
 
Joined
2 Jun 2005
Messages
14,841
Reaction score
477
Location
Cumbria
Country
United Kingdom
Or just show it to any good sparky and they'll say, "oh thats 4mm²" :LOL:
 
Joined
4 Aug 2006
Messages
120
Reaction score
0
Location
Lancashire
Country
United Kingdom
Thanks guys
From your replies, I would therefore assume that earth cable does come in a thickness less than 4mm

cheers
 
Joined
2 Jun 2005
Messages
14,841
Reaction score
477
Location
Cumbria
Country
United Kingdom
Yes, you can get it in smaller sizes, the smaller than 4mm² that are available in standard sizes for copper cables are 1mm², 1.5mm², 2.5mm².
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Top