The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades
You are not logged in. [Log In] ECN Homepage » Forums » Technical Discussion » Electrical Theory and Applications » 3 phase total amps
Register User    Forum List        Calendar     Active Topics     Search     FAQ
Live Chat

Join in a Live Electrical Chat!
 Live Electrical Chat
 >> Enter/Register
 

  Sorry, your browser is not Java enabled, please visit our java support pages in Chatroom
Recent Posts
One Doorbell Button to 4 Doorbells/Chimes
by sparkyinak
Yesterday at 11:37 PM
Housekeeping and Clean-up
by renosteinke
Yesterday at 12:52 PM
Back to back bends on electric bender
by Tesla
05/20/12 05:38 PM
Which bright spark can help me here?
by LarryC
05/20/12 11:20 AM
100AMP panel in 60 degree ambient what size wire?
by twh
05/19/12 07:21 AM
New in the Gallery:
An old Amprobe model 550
Shout Box

Top Posters (30 Days)
HotLine1 29
gfretwell 27
sparkyinak 17
twh 15
renosteinke 15
Classified Ads:


Electrical-Classifieds.com

Who's Online
0 registered (), 90 Guests and 2 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#127929 - 03/19/02 08:51 AM 3 phase total amps
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
When measuring 3phase feeders with an amp clamp on a 100a panel, I believe each phase is good to 100 amps, but we do not add all 3 phases to have a total of 300 amps, correct?
_________________________
The Golden Rule - "The man with the gold makes the rule"

Top
#127930 - 03/19/02 12:38 PM Re: 3 phase total amps
Bob Offline
Member

Registered: 02/05/02
Posts: 182
Loc: Mobile, AL, USA
You are correct. The panel is rated 100 amp
3 phase. Each phase is limited by the breaker and the conductor rating. As an example you might measure A = 50a B = 60a
and C = 50a. You do not add the total and
get 110 amps.

Top
#127931 - 03/19/02 05:30 PM Re: 3 phase total amps
Ron Offline
Member

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
If you were to measure 80 amps per phase, it would be 80 ampere, 3 phase on a 100 ampere panel. And, the utility will charge you for the equivelent of 80 amperes, 3 phase which is more than 80 amperes 1 phase.
_________________________
Ron

Top


Moderator:  C-H, dougwells, electure, frenchelectrican, gfretwell, HotLine1, LK, Scott35, Trumpy 
Board Rules · Mark all read
· ECN Homepage · Top

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals