Earth/moon.

Ragnar_AT said:
As soon as you have one fault you effectively get the equivalent of a TT system and one conductor is now referenced to a fixed potential.
Click to expand...
A fault from what to what? If there is no 'earth' anywhere to be seen, it presumably can't be to that?
Ragnar_AT said:
If there‘s a second fault you need protection. Just like an IT system.
Click to expand...
Are you Perhaps talking about a situation in which the first fault is from one side of the supply to 'something touchable' and the second fault is from the other side of the supply to something which is simultaneously touchable?
 
Koolpc said:
They could run a giant earth cable from the Earth to the Moon!!
Click to expand...
It would either have to have a lot of slack or be elastic - since, unlike the situation with buildings on earth the required cable length would vary appreciably over time :-)
 

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