Discuss capping in the Electrical Forum area at ElectriciansForums.net
Also two lengths of capping is not a substitute for metallic earthed conduit. If it was deemed acceptable it would state in the regs earthed metallic conduit or similar but it doesn't.
Think about it for a minute now would ya. What purpose does an earthed metallic sheath serve in a cable? Why would an earthed metallic length of capping be any different to this? We all know it isn't mentioned in the regs, but we're talking theoretically here right.
Think about it for a minute now would ya. What purpose does an earthed metallic sheath serve in a cable? Why would an earthed metallic length of capping be any different to this? We all know it isn't mentioned in the regs, but we're talking theoretically here right.
Because capping does not fully enclose the cable nor is it in direct contact with the cpc
So would it be fair to say that if it isn't listed as a method of providing penetration protection the same as an earthed metallic sheath, but, it is as safe as, then it could be listed as a departure from BS7671?
Unless the wall is so thin that the distance between the cable and the other side of the wall is less than 50mm then the cable doesn't need to be enclosed. Also, if the capping is earthed then of course it is in direct contact with the cpc.
nor is it in direct contact with the cpc
No it is not in direct physical contact with the cpc of a cable. It is connected by a flying lead. I'm out.
Good point, what if 2 or 3 different circuiits are behind one section of capping? Only one circuit providing the CPC to the capping. Then that circuit gets disconnected from the DB at a later date?
a valid point. go to the top of the class.
Look feel free to do it your way but its not a suiable method as per BS7671 whether you feel it works in theory or not.
If i was inspecting the work on one of my jobs I would get you to do it as per BS 7671 regardless of whether you think its acceptable in theory or not.
Tell you what, how about raising it when it comes round to your scheme assessment. See what they say then.
Good point, what if 2 or 3 different circuiits are behind one section of capping? Only one circuit providing the CPC to the capping. Then that circuit gets disconnected from the DB at a later date?
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