oscar21
Nearly Esteemed
I'm in a questions asking mood tonight. I briefely looked at a job today and I need to recommend a board change but need to justify it. Firstly there isn't any main switch, just two RCD's. Looks like an old 16th ed board and someone has replaced the old main switch with an RCD and then looped the tails straight across to the 2nd RCD so its kind of a dual RCD board but no means of isolation.
But secondly its had a solar install done at some point and the MCB for it is after the second RCD so if the RCD was to trip the solar would still be supplying the various circuits on the same bus bar, including the faulty circuit that had caused the trip. Is this an actual dangerous fault, could you still get a shock of the exposed metalwork if it has a live to earth fault via the solar panels, ie is the neutral side of the inverter grounded, I suppose it would be if its connected to the neutral bar in the consumer unit.
I don't do solar installs so how are they actually tied into the consumer unit, the cable is twin and earth so it would need RCD protection, do you have to use a 1 way unit or can it just be fed of an RCBO before any other RCD's/RCBO's
But secondly its had a solar install done at some point and the MCB for it is after the second RCD so if the RCD was to trip the solar would still be supplying the various circuits on the same bus bar, including the faulty circuit that had caused the trip. Is this an actual dangerous fault, could you still get a shock of the exposed metalwork if it has a live to earth fault via the solar panels, ie is the neutral side of the inverter grounded, I suppose it would be if its connected to the neutral bar in the consumer unit.
I don't do solar installs so how are they actually tied into the consumer unit, the cable is twin and earth so it would need RCD protection, do you have to use a 1 way unit or can it just be fed of an RCBO before any other RCD's/RCBO's