 |
04-14-2012, 12:17 AM
|
#1
|
|
Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
|
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?
|
|
|
Join the #1 Electrician Forum Today - It's Totally Free!
ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!
Join ElectricianTalk.com - Click Here
|
Warning: The topics covered on this site include activities in which there exists the potential for serious injury
or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!
|
04-14-2012, 12:31 AM
|
#2
|
|
cog
Join Date: Sep 2010
Location: cana-duh
Posts: 2,987
|
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?
|
Depends on what you know, and what you are trying to find.
|
|
|
|
|
04-14-2012, 12:33 AM
|
#3
|
|
Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,273
|
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
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
|
|
|
|
|
The Following 8 Users Say Thank You to 480sparky For This Useful Post:
|
|
|
04-14-2012, 12:54 AM
|
#4
|
|
Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
|
Quote:
|
Originally Posted by stuiec
Depends on what you know, and what you are trying to find.
|
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
|
|
|
|
|
04-14-2012, 01:08 AM
|
#5
|
|
Junior Member
Join Date: Apr 2012
Location: Logan city, Brisbane Australia
Posts: 3
|
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
|
|
|
|
04-14-2012, 01:34 AM
|
#6
|
|
Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,454
|
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?
|
What are you looking for? 208/1.73=120 ?
Welcome to the forum.... 
|
|
|
|
|
04-14-2012, 01:38 AM
|
#7
|
|
Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,273
|
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
|
You don't know the voltage required by the rack?
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
|
|
|
|
|
04-14-2012, 01:47 AM
|
#8
|
|
Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,454
|
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
|
3,120Watts/208Volts= 15 amps. W/E=I
15 Amps x208Volts = 3120 watts. I/E=W
|
|
|
|
|
04-14-2012, 01:47 AM
|
#9
|
|
Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
|
Quote:
Originally Posted by 480sparky
You don't know the voltage required by the rack?
|
Many of these PDU's get fed with two (or three) hots and a neutral to serve a variety of loads.
__________________
One reason not to give DIY advice:
Catch a man a fish and you can sell it to him.
Teach a man to fish and you’ve ruined a good business opportunity.
|
|
|
|
|
04-14-2012, 09:28 AM
|
#10
|
|
Exasperating Member
Join Date: Apr 2010
Location: Central CT US of A
Posts: 2,211
|
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.
|
|
|
|
|
04-14-2012, 09:30 AM
|
#11
|
|
Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,273
|
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.
|
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?
|
|
|
|
|
04-14-2012, 08:18 PM
|
#12
|
|
Senior Member
Join Date: Apr 2012
Location: Apple valley ca
Posts: 198
|
Quote:
|
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
|
Thanks for the answer
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
Similar Threads
|
| Thread |
Thread Starter |
Forum |
Replies |
Last Post |
|
3 phase formula
|
pimpin electrician |
General Electrical Discussion |
18 |
05-18-2010 02:32 PM |
|
CMA Formula Help
|
GDK 13 |
General Electrical Discussion |
7 |
05-10-2010 09:24 PM |
|
Formula 1
|
user4818 |
Off Topic |
24 |
03-20-2010 10:48 PM |
|
Generator KVa Formula
|
Bill442 |
General Electrical Discussion |
5 |
03-18-2009 10:20 PM |
|
formula
|
stillirnin |
General Electrical Discussion |
1 |
10-28-2008 06:45 PM |
|
|
