and to feed mains to moored boats from individually TT supplies and RCDs.
I suspect part of the problem is that the American' just don't do TT - I think that in most cirumstances their regs simply prohibit it. They go for a multiply earthed neutral (PME-ish) approach instead - often directly connected to the HV neutral/earth- which while it gives a low impedance to earth in normal conditions, can come horribly unstuck under what we'd call broken PEN conditions.
and to feed mains to moored boats from individually TT supplies and RCDs.
I suspect part of the problem is that the American' just don't do TT - I think that in most cirumstances their regs simply prohibit it. They go for a multiply earthed neutral (PME-ish) approach instead - often directly connected to the HV neutral/earth- which while it gives a low impedance to earth in normal conditions, can come horribly unstuck under what we'd call broken PEN conditions.
