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Do I need to rewire my ring final?
Former Community Member
Good afternoon, I'm looking for some advice as to whether I need to get someone in to have my ring final rewired. I have recently had a new consumer unit installed and circuits tested. All circuits tested fine according to regulations, but the ring final registered lower insulation resistance readings. live/live 119mohm and live/earth 105mohm tested at 500v. Max Z's 0.52ohm according to the certificate. I'm not sure how old the wiring is but we've been here 20 years and the wire has grey pvc outer sheath, red live pvc, black neutral pvc and 3 stranded earth, which looks like plated copper. Some of the sockets are probably the same age. Strangely, some other circuits with same type of cable registered 999mohm when tested. FYI we live in a 1960's bungalow. Just wondered if you had any thoughts. Many thanks in advance. Simon
Yes as others have said based on the information given nothing wrong with those readings.
Given that your installation is some 50+ years old it is probably non-compliant with the current Edition of BS 7671 unless it has been upgraded.
The common non- compliances with an installation of that age are, the water pipe used as a means of earthing, un-earthed lighting circuits, the absence or undersized main bonding and earthing conductors
, the absence or part absence of RCD protection, absence of RCD protection or supplementary bonding in bathrooms, worn sockets and other accessories, open backed wooden consumer units, etc
If you have not had any upgrades and improvements then for your safety and the safety of your family and loved ones I would highly recommend upgrading to the 18th Edition of the Wiring Regulations.
Yes as others have said based on the information given nothing wrong with those readings.
Given that your installation is some 50+ years old it is probably non-compliant with the current Edition of BS 7671 unless it has been upgraded.
The common non- compliances with an installation of that age are, the water pipe used as a means of earthing, un-earthed lighting circuits, the absence or undersized main bonding and earthing conductors
, the absence or part absence of RCD protection, absence of RCD protection or supplementary bonding in bathrooms, worn sockets and other accessories, open backed wooden consumer units, etc
If you have not had any upgrades and improvements then for your safety and the safety of your family and loved ones I would highly recommend upgrading to the 18th Edition of the Wiring Regulations.
