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Posted to uk.d-i-y
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US power system
On 16/04/14 11:33, wrote:
On Wednesday, April 16, 2014 10:56:18 AM UTC+1, Tim Watts wrote:
Does this mean that their back end supply is actually 6 phase?
No.
American houses are typically supplied split phase, where a single
phase is centre grounded, giving two legs each at approx 120v to
earth each and 240v between each other. Some do have two phases of a
three phase supply giving 208v between each other (this causes
problems). This is the situation at least domestically.
They also have another strange layout called high leg delta, where
power is three phase delta connected, with one of the phases centre
grounded, giving two legs with 120V to neutral, 240v phase to phase
and one phase with 208v to neutral.
The back end is normal three phase power.
Philip
Gawd - what a mess.. Sounds like the ancient days in London when you had
funky weird local supplies like one voltage for lighting, another for
power hungry devices and some random 90-degree 2 phase supplies.
My father worked on some of the old equipment that was used to integrate
that lot - including Scott and Leblanc transformers that can interface 3
phase with 2-phase/90 degree systems.
Of course, they managed to eventually get rid of all the crap.
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