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When replacing distribution boards/CUs you will need to an "Initial Verification" and based on what you find advise the client of any remedial works required. and you dont issue the cert until compliance is achieved. ---------- Post Auto-Merged at 13:18 ---------- Previous post was made at...

When replacing distribution boards or CUs then do an Initial Verification, this will keep you right, Any defects should be brought to the attention of the client, certificate can not be issued until remedial works are completed. ---------- Post Auto-Merged at 13:04 ---------- Previous post was...

Use 2.5 for compliance with table 54-7 or as above calculate using adiabatic equation - cheers

Replacing distribution boards/CUs requires Initial Verification and completion of any defects prior to issueing certificate. Re RCDs reliable/unreliable - RCDs parameters can change with age hence periodic testing through the ranges required, they have their place.

Assuming the following 1- No CPC at board 2- Old system wired in singles through trunking conduit etc. 3- Back boxes are metal 4- all equipment unplugged If getting 39 ohms i would agree N-E fault as you would get 0 ohms if there is a netral in your ring connected to another board, would...