Hi,
I have come across a two-core SWA cable connected into a metal cased CU. The "banjo" is bolted to the case of the consumer unit and the consumer unit's earth bar is then electrically connected to the case by one of its supports, which are metal.
Is this acceptable? There is good continuity between the cable armour and the earth bar but surely it would be usual to run an extra earth wire between the bolt and the earth bar - too many variables otherwise - what if someone forgets to sand the paint off the case where the bolt goes through, for instance, and it doesn't make a good connection?
It might be totally fine and I'm overthinking it, I was just slightly shocked as I wouldn't have thought it was acceptable to rely on the case to provide the sole earth connection for the entire consumer unit!
I have come across a two-core SWA cable connected into a metal cased CU. The "banjo" is bolted to the case of the consumer unit and the consumer unit's earth bar is then electrically connected to the case by one of its supports, which are metal.
Is this acceptable? There is good continuity between the cable armour and the earth bar but surely it would be usual to run an extra earth wire between the bolt and the earth bar - too many variables otherwise - what if someone forgets to sand the paint off the case where the bolt goes through, for instance, and it doesn't make a good connection?
It might be totally fine and I'm overthinking it, I was just slightly shocked as I wouldn't have thought it was acceptable to rely on the case to provide the sole earth connection for the entire consumer unit!