In an ideal world they are only hot relative to the other. In the
real world there will be leakage and also faults that connect one or
other pole to the grounding system. So then the other pole will
thereby become hot. So, again, they are both potentially hot. And
both therefore need to be fused, switched, etc...
"If neither pole is grounded then both must be treated as potentially hot."
Only with regard to the other hot wire. If you do not reference one
conductor to ground than the other one will not present any danger
unless you are referenced to its mate... as in touching both wires
at once.
Todd
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Hugh Piggott
Scoraig Wind Electric
Scotland
http://www.scoraigwind.co.uk
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