Floyd asked in Science & MathematicsEngineering · 2 months ago

# Electrical panel?

If your using a 3 phase panel to wire something up, and the panel is rated for 480v. If I run two of the phases to some equipment. Whatever it may be. What would be the total voltage of the two phases? Would it be 480 + 480 = 960?

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• 2 weeks ago

I doubt very much that you have a 480V system and/or that it is three phase unless you are in a huge industrial building.

If you were you would know about three phase and 480 volts.

If you are in the USA you probably have 110/220 V system. The phases are 180 out of phase and when you connect across the hots you get 220 VAC @ 60 Hz.

If you are in the UK or elsewhere you get elsewhere volts and maybe 50Hz.

The 480V panel means the spacing is made for 480V.

• 4 weeks ago

If something is rated for 480 volts means that it can cope with 480 volts without issue.  In equipment installed maybe only for a 120-volt system.

The supply voltage can be quite different to the rated voltage.

In any three-phase system the ratio between the phase voltage and line voltage is a factor of Root 3.   or multiply the phase to a neutral voltage by 1.414.

Or divide the line to line voltage by .707.

• 1 month ago

I will make an assumption or two here.  First, you are actually supplying the 480 Volt panel with 480 volts three phase 4 wire supply.  Second that you know what you are doing in operating on a 480 volt panel.

When you extend two of the three phases to another panel or load, this in effect is a single phase system and will function as a single phase system in all respects with one exception.  The voltage to ground will be 277 volts not 240 volts.

Hope this helps

• Dixon
Lv 7
2 months ago

The panel is rated for 480V 3 phase systems. The phase to phase voltages are 480V and the phase to neutral / ground voltages are 277V

• Anonymous
2 months ago

"the panel is rated for 480V" does not mean

the mains voltage is 480V

there is no such 480V mains anywhere in the world

a 120V single phase line will give 120X1.732=208V

three phase voltage between two lines

a 240V single phase line will give 240X1.732=415V

three phase voltage between two lines

• 2 months ago

ANY PHASE TO PHASE VOLTAGE IS 480V  !!!

• 2 months ago

what is the phase voltage, which is NOT the panel rating?

If it is 480 volts per phase, then phase-phase voltage is 480√3 which is 830 volts

others:

120√3 = 208

240√3 = 415