On 06/06/2019 19:51, Nightjar wrote:

The USA has a +55v 0v -55v system. White is 0v. Black and red are both
lives, one +55v and one -55v, although I forget which is which. Wiring
across black and red gives 110v. There is also a blue live for use in
three phase systems.



Where? The USA's common system is 120V-0-120V with phase-phase being
used for high load devices.

You're not confusing this with "yellow" building site transformers and
tools are you?

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