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Old 04-25-2013, 02:36 PM   #1
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volt/phase to amp/volt


Is a 600 volt three phase service different than a 100 or 200 amp 120/240 volt service?

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Old 04-25-2013, 02:41 PM   #2
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Quote:
Originally Posted by leigh trethewey View Post
Is a 600 volt three phase service different than a 100 or 200 amp 120/240 volt service?
Yes.

120/240 is usually a single phase.
600 volt 3 phase is rare in some parts of the states

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Old 04-25-2013, 05:24 PM   #3
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600V three phase is relatively common in industrial uses, typically seen where large motors are in use. As noted previously, 120/240 is single phase service, properly termed split phase.
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Old 04-25-2013, 05:50 PM   #4
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They are very different in many ways.

Why do you ask?
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Answers based on the 2011 NEC.
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Old 04-25-2013, 06:19 PM   #5
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600 volt three phase is the standard industrial voltage used in Canada. In US it more commonly 480 volt three phase.
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Old 04-25-2013, 06:58 PM   #6
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Quote:
Originally Posted by joed View Post
600 volt three phase is the standard industrial voltage used in Canada. In US it more commonly 480 volt three phase.
That 'was' about to be my response....
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Old 04-25-2013, 07:33 PM   #7
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The two systems are different in almost every way.

Panels and breakers are different, switches and receptacles are different, the loads they serve are different, about the only thing that's the same is they both can use the same wire (but usually different colors).

If the service is 600 volt, the only way to use 120 or 240 volt equipment is with a transformer.

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Old 04-26-2013, 07:39 AM   #8
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Hmmm. So that's why 600 volts is a common rating for electrical components including switches and wire. (Other common ratings are 250 and 125 volts). You can use higher voltage rated wire for lower actual voltages.

For series circuits (rare except for Christmas lights) components must be rated for the supply voltage, not the voltage of an individual lamp or component.

For "services" even the 600 volt 3 phase has an amperes rating such as 100 amps. The amperes rating is dictated by wire and meter and component current handling capability, and electric companies offer a small finite number of service choices. The amperes rating of a service is the number of amperes that may be drawn from any one leg or phase.

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Last edited by AllanJ; 04-26-2013 at 07:47 AM.
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