Quote:
Originally Posted by G6Tanuki
What is the earthing-schema? Round here everything [with power supplied by two-wire overhead lines] is TT. You may find older "PME" schemas which are deeply frightening if you're supplied with overhead lines where loss-of-neutral could be an issue [neutral / earth can rise towards line if the neutral-circuit is opened]
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Hi G6,
In fact, almost all new connections from supply companies are PME (with a few exceptions)! It's their preferred distribution method and has several advantages. Very low earth loop impedance being the main one.
Older, overhead, 2 wire supplies were often TT, but it's very unusual these days. PME is king!!
There are several special scenarios where PME will not be offered, ie- to all metal buildings, petrol stations, marinas etc, but most new domestic installations will be PME.
Cheers
Nick