Discuss 6mm Main Earthing Conductor in the Electrical Forum area at ElectriciansForums.net

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I'm looking at doing a CU change. Current main earthing and bonding conductors are both 6mm. Tails are 16mm on a 60/80 amp fuse (TNCS). ZE = 0.1 , 230v, single cable not bunched.

Looking at the regs (543.1.1) and applying the adiabatic equation (543.1.3), 6mm seems ok for main earthing conductor.

As for bonding, BPG1 states that 6mm will be ok if there is no sign of thermal damage.

It would be quite a job to replace so hoping not to.

Am I missing something glaringly obvious please? Thanks
 

westward10

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Pre 16th Ed (15th Ed) the Regulations never quoted a minimum size for main protective bonding for TN-C-S supplies they suggested consulting the supply company, so with this in mind and assuming this is pre 16th Ed you will never know whether those conductors fulfilled the requirements of the time.
 

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