ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Unusual Well Pump Switch Failure
by sabrown - 10/28/20 04:31 PM
Look at this mess...
by InspectorE - 10/27/20 09:09 PM
New tool
by gfretwell - 10/24/20 11:09 AM
Where is Everyone?
by Bill Addiss - 10/17/20 07:04 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 14 guests, and 17 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
3 phase total power #127547 08/22/01 08:43 PM
Joined: Aug 2001
Posts: 545
A
aldav53 Offline OP
Member
When measuring each leg on a 3 phase service, if it is a 200amp panel and the feeder wire is good for 200 amps, that would mean each leg is good for 200amps measuring individually with an amp clamp. Is this correct? If it is, does that mean you have a total of 600 amps?, or is that just the relationship between the phasing in the transformer, and actually only have a 200amp total.
Hope this makes sense..


The Golden Rule - "The man with the gold makes the rule"
Tools for Electricians:
Re: 3 phase total power #127548 08/22/01 08:57 PM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
If you have a 208 volt system, you'll have 72051 voltamps available. If it's a 120/208 system, you will have a total of 600 amps of 120 volt power available.
If a 480 system you'll have 166272 voltamps available. If a 277/480 system this will give you a total of 600 amps of 277

Re: 3 phase total power #127549 08/22/01 09:25 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
Electures explanation is a good one. I like to keep it simple - the conventional definition is a 3 phase 200 amp service. Total available (apparent) power = V x A x 1.73

[This message has been edited by Redsy (edited 08-22-2001).]

Re: 3 phase total power #127550 08/22/01 09:54 PM
A
Anonymous
Unregistered
Note: 1.73 is really the square root of 3.

Re: 3 phase total power #127551 08/24/01 06:34 AM
Joined: Jul 2001
Posts: 311
F
Frank Cinker Offline
Member
"If it is, does that mean you have a total of 600 amps"? My question is: Wouldn't there actually be 600 amps available for example if all loads were 120 volts, line to neutral? I know it would not be practical. However, wouldn't it be possible?

Re: 3 phase total power #127552 08/24/01 06:41 AM
Joined: Jul 2001
Posts: 311
F
Frank Cinker Offline
Member
I forgot to mention in my above example the service is: 120/208V, 3Ph, 4W, 200 amps.

Re: 3 phase total power #127553 08/24/01 08:22 AM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
I still say no. It would be a balanced 3 phase 200 amp load, equally divided between the phases at 200 amps each. However, you could supply 20 10 amp 120 volt loads on each leg. This would translate 600 a. x 120 v. which puts you back to 72,000 watts.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
271,051 Are you busy
205,040 Re: Forum
193,164 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3