I think they are saying that they have covered (iv)but they contend that there are times when an open pen could result in voltages in some properties staying within set limitations but where the car to earth touch voltage can exceed 70v. They have an additional feature that measures current flow in the protective conductor to the car which operates at circa 18mA. I suppose they are claiming that to be (v)
As to the nuisance tripping, I guess that is a price to be paid for closer protection.
I think they are saying that they have covered (iv)but they contend that there are times when an open pen could result in voltages in some properties staying within set limitations but where the car to earth touch voltage can exceed 70v. They have an additional feature that measures current flow in the protective conductor to the car which operates at circa 18mA. I suppose they are claiming that to be (v)
As to the nuisance tripping, I guess that is a price to be paid for closer protection.
