To bond or not to bond

[gavonto]

Whilst on my 16th upgrade about 3yrs ago, I recall my lecturer informing us that all central heating boilers have to be bonded direct from the MET, as you do with gas & water.

Recently, my mate had his boiler replaced, & the plumber said exactly the same thing, although I cannot find it anywhere in the regs.

 

[plugwash]

iirc central heating is listed under serivces that need to be bonded but it is unclear if this only applies if its a service coming from outside the equipotential zone.

 

[andy]

Whilst on my 16th upgrade about 3yrs ago, I recall my lecturer informing us that all central heating boilers have to be bonded direct from the MET, as you do with gas & water.

Recently, my mate had his boiler replaced, & the plumber said exactly the same thing, although I cannot find it anywhere in the regs.

AFAIK, you only cross bond the pipes from the boiler. no need to take it to the MET, since the water pipe does the same thing

 

[gavonto]

AFAIK, you only cross bond the pipes from the boiler. no need to take it to the MET, since the water pipe does the same thing

That`s what I thought, but it`s obvious that people still believe that they have to bond directly from the MET
_________________
moderator

edited to correct quote

 

[gavonto]

That`s what I thought, but it`s obvious that people still believe that they have to bond directly from the MET

 

[--tom]

So does this mean that :
1. the primary flow and return only have to be cross bonded at the boiler?
2. the bonding can occur anywhere in the heating system?
3. All metal pipework at the boiler must be cross bonded?

As a matter of interest, i've seen this discussed elsewhere and the general conclusion was that bonding was not necessary at the boiler if main and supplementary bonding were already correctly installed.

 

[andy]

So does this mean that :
1. the primary flow and return only have to be cross bonded at the boiler?
2. the bonding can occur anywhere in the heating system?
3. All metal pipework at the boiler must be cross bonded?

As a matter of interest, i've seen this discussed elsewhere and the general conclusion was that bonding was not necessary at the boiler if main and supplementary bonding were already correctly installed.

you should cross bond all pipes leaving the boiler. the idea is to make all pipes at the same potential

 

[Damocles]

Yes mate, me too. Why should the boiler pipework be cross bonded? I recall reading something about boilers having metal flue pipes which pass out of the building, hence they are a source of possible external earth and need primary bonding. Where is the reason for cross bonding the pipework?