Rewire - Bonding?

[whazza22]

Hey All,

I know this has probably been asked thousands of times but I just want to clarify what bonding is required when doing a full rewire.

Would it just be main bonding from the consumer unit to the water and gas in 10mm, plus cross bonding from pipes to sinks etc in 4mm?

Thanks

 

[telectrix]

main bonding . as long as you Zs readings show disconnection times can be met, no need for supplementary bonding. if its a TT system, everything needs to be RCD.

 

[Johno]

Yep, average house = 10mm2 to water and gas with no supplementary required.

 

[Des 56]

Yep, average house = 10mm2 to water and gas with no supplementary required.

It is required

There are install conditions,if they can be met you can then omit

 

[Johno]

Give us a lesson then des.

 

[Des 56]

Give us a lesson then des.

Meaning ?

 

[Johno]

Of course you right, you can only omit if the conditions are right.

In my experience, in the average home, there has not been a need for supplementary bonding.

 

[Deleted member 9648]

Hey All,

I know this has probably been asked thousands of times but I just want to clarify what bonding is required when doing a full rewire.

Would it just be main bonding from the consumer unit to the water and gas in 10mmNot the only sevices,Oil is quite likely,and any other metallic services likely to introduce an earth potential,in older properties this may include metallic drain pipes. , plus cross bonding from pipes to sinks etc in 4mm?Supplementary may be required in special locations.....this does not include kitchens so bonding of sinks/heating pipes in such areas is not required,

Thanks

...................

 

[cjp1]

16mm from db to main earthing terminal 10mm to gas and water
check out brb 701.415.2 for info on the supplementary bonding in the bath/shower rooms.

 

[ezzzekiel]

Give us a lesson then des.

he really shouldnt need to give lessons on supp bonds it is quite basic stuff, but supp bonding is to be used where areas of particular dangers may occur (special locations) it can be ommited if main bonds, disco times and rcds are in place and correct although personally on rewire i would still provide supp bonds in bathrooms, kitchens, cross bonds at boiler etc even though it is not a requirement it costs nothing major

 

[feselectrical]

I have always been of the opinion that you cannot have too much earthing.

 

[BlueToBits]

Wot, no Adiabatic??? 2.5mm main bonding could be all you need on a TNS.

 

[Sintra]

Afraid the adiabatic can not be used for sizing bonding conductors.

 

[SirKit Breaker]

main earth min 50% csa of supp tails, main bonding min 50%csa of main earth, supp bonding 50% of main bonding. CSA will depend on DNO fuse rating.

Cheers.........Howard

 

[AndrewMgan1976]

I was wiring an extension today, no bonding at all in, so had to run a 10mm to Gas, Water and also took it to the boiler too.