Posted By Ian Blenkharn I'd appreciate thoughts about earth continuity testing of power sockets in a multi-level laboratory block, though the issue would be the same elsewhere. Lots of power outlets in many many rooms. Over the years, regular building works, room reconfiguations including major works, refurbishments etc. Lots of electrical equipment, all PAT tested as required, but what about the socket we plug into? Is there any standard that requires testing of earth continuity from sockets. A good idea obviously, and with the long long lists of sometimes serious items picked up when snagging building works, one that we should be doing far more often. What is the norm for checking earth continuity? Not a 'live issue' for me, just one that has come up in discussion. In 30+ years, I've never known it be done, and no incidents, but is this an accident waiting to happen?

Posted By jde The testing of the sockets falls under the buildings electrical integrity. Every 3 years buildings should have their electrical systems tested for insulation, continuity and polarity. Hope this helps.

Posted By Alan Hoskins Whilst undertaking those tests, you should also be checking the Earth Loop Impedance, as this is what effectively allows the operation of the circuit protective devices under fault conditions. It will identify if any of your circuits are too long, or if there is any other connection problem (such as corrosion), when the ELI will be above the required maximum value for the circuit.

Posted By Ian Blenkharn Lots of interesting and helpful comments. Thank you all. I came across disconnected earth wires lurking behind sockets here at home, thanks to the enthusiastic amateur I bought the house from. It would be of no surprise to find similar problems, and more, in commercial premises thanks to the unenthusiastic professional!