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04-14-2012, 12:17 AM
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#1
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Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
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Three Phase Pie Formula
I was wondering on a three phase 120/208 volt system what voltage would you use to plug into the pie formula?
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04-14-2012, 12:31 AM
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#2
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cog
Join Date: Sep 2010
Location: cana-duh
Posts: 2,996
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Quote:
Originally Posted by MIKEFLASH
I was wondering on a three phase 120/208 volt system what voltage would you use to plug into the pie formula?
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Depends on what you know, and what you are trying to find.
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04-14-2012, 12:33 AM
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#3
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,291
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8 cups sliced, peeled assorted baking apples - about 3 lbs. (Granny Smith, Cortland, Jonathan)
2 Tablespoons lemon juice
3/4 cup white sugar
1/4 cup brown sugar
1/4 cup all-purpose flour
1 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
2 Tablespoons butter
1 egg yolk
1 Tablespoon milk
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In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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The Following 8 Users Say Thank You to 480sparky For This Useful Post:
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04-14-2012, 12:54 AM
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#4
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Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
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Quote:
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Originally Posted by stuiec
Depends on what you know, and what you are trying to find.
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Well i have the wattage to this data rack but need to know what voltage to insert into the equation to find out how many amps it draws
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04-14-2012, 01:08 AM
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#5
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Junior Member
Join Date: Apr 2012
Location: Logan city, Brisbane Australia
Posts: 3
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i' used to a 230/400 volt system, but to convert for power calcs we multiply the single phase voltage to a 3 phase system by root 3 or 1.71 e.g p=VI changes to P= VI times 1.71, to get the single phase from a 3 phase calc we do the reverse of this
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04-14-2012, 01:34 AM
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#6
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Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,501
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Quote:
Originally Posted by MIKEFLASH
I was wondering on a three phase 120/208 volt system what voltage would you use to plug into the pie formula?
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What are you looking for? 208/1.73=120 ?
Welcome to the forum.... 
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04-14-2012, 01:38 AM
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#7
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,291
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Quote:
Originally Posted by MIKEFLASH
Well i have the wattage to this data rack but need to know what voltage to insert into the equation to find out how many amps it draws
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You don't know the voltage required by the rack?
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In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-14-2012, 01:47 AM
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#8
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Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,501
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Quote:
Originally Posted by MIKEFLASH
Well i have the wattage to this data rack but need to know what voltage to insert into the equation to find out how many amps it draws
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3,120Watts/208Volts= 15 amps. W/E=I
15 Amps x208Volts = 3120 watts. I/E=W
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04-14-2012, 01:47 AM
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#9
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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Quote:
Originally Posted by 480sparky
You don't know the voltage required by the rack?
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Many of these PDU's get fed with two (or three) hots and a neutral to serve a variety of loads.
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Catch a man a fish and you can sell it to him.
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04-14-2012, 09:28 AM
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#10
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Exasperating Member
Join Date: Apr 2010
Location: Central CT US of A
Posts: 2,211
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Unless you really need it for a specific load, make sure to run separate neutrals to each circuit. You never want to have a dropped neutral on a data rack. Your insurance won't like it.
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04-14-2012, 09:30 AM
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#11
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,291
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Quote:
Originally Posted by MDShunk
Many of these PDU's get fed with two (or three) hots and a neutral to serve a variety of loads.
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I know... but why isn't the voltage requirement of the rack already known? Seems to be a cart-before-the-horse question.
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-14-2012, 08:18 PM
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#12
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Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
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Quote:
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Originally Posted by fraserelectrical
i' used to a 230/400 volt system, but to convert for power calcs we multiply the single phase voltage to a 3 phase system by root 3 or 1.71 e.g p=VI changes to P= VI times 1.71, to get the single phase from a 3 phase calc we do the reverse of this
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Thanks for the answer
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