Recent content by newfoundspark

Doing the 2391 soon, and have a question about the test ! There is a submain board, which is fed by a 100A 30ma RCD (i believe), and understand that, i will do a Zs on this - as it is a circuit fed by the 3 phase board. I will then make sure the main switch, in this case the 100A 30mA RCD...