Testing, do you?
Yes, even adding a back to back socket!
The minimum requirement here is: insulation resistance, earth loop impedance (this is the most important, as a break in the external earthing facility from the power co. may not be detectable without this test) & RCD trip time, if an RCD is present.
Also a check should be made to ensure there is main bonding of water, gas etc.
These tests are mandatory to comply with BS 7671 (IEE Wiring Regs.).
A minor works certificate should be issued for such a job, the above test results need to be provided on the certificate.
In Scotland, compliance with BS 7671 has the force of law behind it, as it is cited in Scottish Building Regs, unlike England.
This does not mean that everybody abides by the Wiring Regs, but as a member of SELECT (The Scottish Electrical Contractors' Association), I am are required to, and try my best to comply.
We do have a huge problem with DIY electrics in this county, but that is another story and I am not going to get on my soap box right now.
David
