sixe of earth link?

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can't remember my 16th edition.
is it 1.5mm earth cable to link with back box on ring main?
 
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just read, last night about earthing back boxes- I was looking for something else

You don't have to bond back boxes if outlet has earth strap to screws and at least one fixed lug.

had to read it twice to make sure
 
i think 1.5mm earth is what you get in 2.5mm T&E so it would seem reasonable to use it for the backbox earth links.

many sparkies use the earth from offcuts of T&E and sleeve it but this is undoubtablly messier than using single earth wire.
 
Least messy of all the methods is to leave the link out (assuming your box complies with the "one fixed lug" rule).
 
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For what it's worth - stick the earth strapper in!!!

I always use single core 2.5, carry it in the van as a matter of course. 1.5 would be fine.
 
Minimum supp' bond is 2.5mm2 when mechanically protected,
 
Further more I'll always cross bond with 2.5.mm. any twin economy seven immersion heater control switch set up - i.e. where there is a daytime boost and nighttime off peak circuit, the two 13amp FCU's earth terminals are cross bonded to one another behind the faceplates.
 
paulh53 said:
Minimum supp' bond is 2.5mm2 when mechanically protected,
Nope, it is the size of the circuit protective conductor for mechanically protected exposed to exposed conductive parts.
I didn't really consider this topic about supplementary bonding.
 
kai said:
Further more I'll always cross bond with 2.5.mm. any twin economy seven immersion heater control switch set up - i.e. where there is a daytime boost and nighttime off peak circuit, the two 13amp FCU's earth terminals are cross bonded to one another behind the faceplates.

Seriously, what is your facination with immersion heaters?

It's getting disturbing.. maybe you should see someone.
 
If two radial circuits terminate close to each other, it would seem sensible to link the earths, although not a necessity. A dual box would make this easier with peak/off peak.

the fly lead from back box to socket is not a supp bond.
 
Spark123 said:
paulh53 said:
Minimum supp' bond is 2.5mm2 when mechanically protected,
Nope, it is the size of the circuit protective conductor for mechanically protected exposed to exposed conductive parts.
I didn't really consider this topic about supplementary bonding.


If you say so :rolleyes:
 
Supplementary bonding is what is applied to extraneous-conductive-parts in some locations.

Back boxes are not extraneous-conductive-parts, therefore any bonding conductors are not supplementary ones.
 
ban-all-sheds said:
Supplementary bonding is what is applied to extraneous-conductive-parts in some locations.

Back boxes are not extraneous-conductive-parts, therefore any bonding conductors are not supplementary ones.

Supplementary bonding can also be applied to exposed conductive parts
 

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