Quote:
Originally Posted by Neuromancer
480V isn't 3 phase 440V? Pretty sure that is were it was on out radar arrays on my first ship. 110v, 220v and 440V (3 phase) electrical systems
That is some serious kick ass equipment. I dont know much about phase cooling, but would bet in an industrial environment (with 440V supply) you could run an octopus off it
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I have been an electrician for 21 years and hold both a Journeyman and Master Electrician License and yes 480VAC is definately 3 phase. 480VAC is comprised of either two or three ungrounded phase conductors that will measure 277V to either the grounded (Neutral) conductor or grounding conductor.
Typical residential power would be 120 / 240V both considered single phase.
120V = One phase conductor, one grounded conductor, and one grounding conductor.
220V = Two phase conductors, one grounded conductor ( not always used), and one grounding conductor.
Typical Commercial power would be either 120 / 208V 3P or 277/480V 3 Phase.Both of these are 4 wire systems. 3 phase conductors, one grounded (neutral) conductor, and a grounding conductor.
Less common but still used is 240V 3 phase this would be comprised of 3 phase conductors and one grounding conductor. This is typically a delta system.
I am not syaing these are the only voltages but these are the most commonly used. I have also worked with transformers for a recording studio which proce 60VAC per leg so you need a two pole breaker and still end up with 120VAC of clean power.