JBee
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- JB
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The subject was around the perceived safety of 3 Phase 400V for use on a winch.Crissa, I respect your knowledge and contributions.
Just wanted to point out that 240V in a home is not 3 phase and it definitely is a "Household Voltage" in the US even though US household convenience outlets are 120V.
3 phase is used for generation, long distance transmission, and often (but not always) local distribution, and industrial 480Delta/277v line to line use.
Pole transformers may convert 3 phase distribution to single phase 240v line to line/120v line to neutral at the household level.
If you live in a multi-unit apartment complex in the US, you may actually plug your toaster into a 208Wye/120v line to neutral 3 phase system.
I am not an electrician, so my understanding could be wrong. Please correct my understanding in that case.
As a comparison that brought up the subject of 415V 3 phase that is a common supply for Australian houses, not American ones. You are right that a 200V split phase is used in the USA instead, but they also have 3 phase as well.
In Australia nearly all residential supply lines come off a 415V 3 phase underground or overhead power line.
Hence the answer to my quiz on how to measure 240V and 415V from just 4 cables, being L1, L2, L3 for the phases, and 1 neutral, looks like this:
Note there is no transformer between the 415V and 240V side, it's just that you measure the 415V potential between any of the three L1, L2 and L3 phases, and 240V potential between any of the phases and neutral instead. Hence the terms phase and line voltages.
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