Quick question. Can anyone confirm if the steel wire on a 4 core armoured cable can be used as an earth?
I’m doing an install for a friend and inverter is going to be in the garage so I need 4 cores for the power to the inverter and power back to house for a essential loads db. When I bought material, I got a separate earth that I was going to lay in conduit but today while laying the cable, I was wondering if the steel wire could be used for the earth. It’s a 27m run. I checked the resistance with my standard fluke and it showed 0.4 ohm. The 6mm earth cable I bought also reads the same.
Technically I think it’s fine but not sure from a regulations point of view.
Anyone know?