Bonding to 3 inch across Gas Pipe

[thepprentice]

In an empty wharehouse where we're just starting work, theres a large supply coming in with its main earth using a 35mm earth cable. I'm going to use 25mm earth for bonding to the gas and water main, however the gas pipe is 3 inches across. And i havent done bonding with that size of earth and pipe before. How do I bond to it? Cheers

 

[Spark123]

Firstly what type of supply? Is it TN-S, TN-CS or TT? What size supply? You need to bond the gas pipe and any other extraneous conductive parts (eg water, metallic structure etc) to the MET using the correct size cable and clamps - clicky.

 

[JohnD]

bonding straps used to be available in a cut-to-length perforated strip. Not sure if this is still used?

but handy for e.g. cast-iron 4" soil pipe, constructional pillars and stanchions, industrial piping. I have an idea it was stainless or phosphor-bronze?

 

[Lectrician]

They come in several lengths - just ask.

You can also get ones with a larger terminal suitable for lugging to.

 

[thepprentice]

its a TN-CS system. Went and got one of those heavy duty earth clamps. Boss said 'grand job lad', So it must be right. Thanks

 

[Lectrician]

What size are the live and neutral tails? Do you know what they are fused at?

Out of interest, is it CT metering, with single ins tails in trunk?

 

[Spark123]

Just for the record, you need to consult the electricity supply company regarding the size of cable you need to use for Main Equipotential bonding for TN-CS (PME).