Richie Webster asks a question about bonding all extraneous conductive parts on a project where a number of these are a considerable distance from the MET concerned. It has been answered by the NICEIC (Theme – Fire & Safety):
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, 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 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 click on the link below to download the attachment (PDF doc – 397kB file size).Answer: This is a satisfactory method of making bonding connections, as long as the continuity of the metal structure can be confirmed as being sufficiently robust.
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