This question is about the main protective bonding of an electrical installation where extraneous conductive parts are some distance from the MET. It has been answered by the NICEIC (Theme – Fire, Safety & Security):
Question: We are about to start bonding all extraneous conductive parts on a project where a number of these are a considerable distance from the MET. The attached diagram (see link below), taken from the ECA's Guide To The Wiring Regulations, shows how structural steel can be used for carrying out the main protective bonding, and we are considering using this method.
I've also had a look through BS7671:2008, Guidance Note 8 and some NICEIC publications and see no reference to this method.
As we are an NICEIC approved contractor, and will be using NICEIC test certification on this project, I thought it would be best to seek advice from yourselves as to whether you would consider this to be an acceptable method of bonding extraneous conductive parts.
Please on the link near the bottom of this page to download the attachment (PDF doc - 391kB file size).
Please advise…
Answer: This is a satisfactory method of making bonding connections, as long as the continuity of the metal structure can be confirmed as being robust.
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