20-11-2020, 07:16 PM
Sam, you know why it read over value, but some readers might not, and wonder how a cap can increase in value. The point is that the magic box is telling lies of a sort that not all will understand.
Cascaded RCDs are bad news. There is no discrimination unless there are suitable time delays. I would expect the main incomer RCD to have a delayed response but beyond that who knows. At least you didn't take out the dairy 3 phase RCD. Unless somebody re-plans the protection and does it correctly you're rather stuck with the problem. The only instant fix is to supply the bench from a hefty isolating transformer, followed by an RCD, to create your own local TT supply which can't be "seen" by the upstream RCDs.
Cascaded RCDs are bad news. There is no discrimination unless there are suitable time delays. I would expect the main incomer RCD to have a delayed response but beyond that who knows. At least you didn't take out the dairy 3 phase RCD. Unless somebody re-plans the protection and does it correctly you're rather stuck with the problem. The only instant fix is to supply the bench from a hefty isolating transformer, followed by an RCD, to create your own local TT supply which can't be "seen" by the upstream RCDs.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
