bonding on gas bottles for cooker

[georges]

TNCS supply. New kitchen fitted two years ago. I'm fitting lights, but have noticed that there isnt any bonding from the gas bottles which supply the cooker. Should I be addressing this issue for the customer? Any advice appreciated.

 

[mayfair]

sure others will advise better but i would have thought no bonding for bottled gas, unless its some strange UK reg.

 

[i=p/u]

very likely the pipe from gas bottle to cooker is rubber

 

[georges]

thanks for that will check tomorrow

 

[pushrod]

The gas bottle will not be an extraneous-conductive-part

 

[Deleted member 9648]

It has to introduce an earth potential in order to require main bonding....not impossible but unlikely....you will be able to establish that on site.

 

[mayfair]

We are talking ordinary gas bottles ....yes......not gas tanks?

 

[PC Electrics]

Assuming we are talking here about red propane, free standing bottles stood at the side of the house then bonding is not required.

 

[Engineer54]

As a matter of interest, ...what type of feul/energy is being used for the central heating, ..if any??

 

[sjm]

Assuming we are talking here about red propane, free standing bottles stood at the side of the house then bonding is not required.

Surely this only applies if the pipe from the bottles doesn't go into ground. We have 4 x propane bottles for central heating and gas hob. the supply pipe (copper) goes into the ground then rises again before entering the house. This must make the supply pipe an extraneous conductive part.

 

[Deleted member 9648]

Surely this only applies if the pipe from the bottles doesn't go into ground. We have 4 x propane bottles for central heating and gas hob. the supply pipe (copper) goes into the ground then rises again before entering the house. This must make the supply pipe an extraneous conductive part.

Yep........

 

[sjm]

very likely the pipe from gas bottle to cooker is rubber

I believe that the permanent supply into the house must be copper. Rubber from gas bottle to control valve however.

 

[Dunc]

Isn't this something you should be carrying out a test for? I'm sure I've read before that you're supposed to disconnect any earths that may be attached to the gas bottles/pipe work (earth from cooker ignition supply for example) then do a continuity test from the MET to the gas bottles/pipe work. If you get a reading of 33,000 ohms or less then it's classed as being an extraneous conductive part and requires bonding.

Wish I knew a reg to check against but I'm fairly certain this is the way to ascertain whether or not bonding is required in a situation like this. As a general rule though the cylinder won't pick up an earth potential unless there is buried pipework or the tanks aren't sited on a concrete base.

 

[IQ Electrical]

Isn't this something you should be carrying out a test for? I'm sure I've read before that you're supposed to disconnect any earths that may be attached to the gas bottles/pipe work (earth from cooker ignition supply for example) then do a continuity test from the MET to the gas bottles/pipe work. If you get a reading of 33,000 ohms or less then it's classed as being an extraneous conductive part and requires bonding.

Wish I knew a reg to check against but I'm fairly certain this is the way to ascertain whether or not bonding is required in a situation like this. As a general rule though the cylinder won't pick up an earth potential unless there is buried pipework or the tanks aren't sited on a concrete base.

You're close Dunc, you're looking for a value of 22KOhms or higher to consider the part in question to be a non-extraneous conductive part.

The figure is derived from a body resistance of 1000 Ohms and a current of 10mA (let-go threshold).

 

[Dunc]

Hadn't imagined it then, what's 11,000 ohms difference anyway?!