Quote Originally Posted by localzuk View Post
What if a building is fed by more than one phase on its own. ie. we use one phase for one half of the main building, and a different one for the other half? We also have network cables crossing that boundary at the moment, within the building, so the situation you describe above could exist in any building using 2 phases and comms gear?
It's rather uncommon to find a school without a 3 phase power supply. Newer installations appear to prefer 3 phase distribution boards over single phase boards/consumer units.
There's also that very little fuss is made about CW1308 cabling between buildings (even several km apart) even though one side of each pair in a (POTS) telephone line typically IS earthed.