ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Light activation in closet by a broken connection?
by geoff in UK. 02/19/19 01:35 PM
AFDD's coming to the UK
by Texas_Ranger. 02/18/19 02:04 PM
Israel
by Texas_Ranger. 02/18/19 02:01 PM
250.104
by gfretwell. 02/16/19 01:08 PM
PurpleAir Recalls Power Supply Units
by Admin. 02/14/19 08:43 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 25 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Wire for 600A 1Phase service #185665
03/23/09 08:22 PM
03/23/09 08:22 PM
Obsaleet  Offline OP
Member
Joined: Apr 2003
Posts: 362
Pa
Hi Guys, I am doing a 600a 1phase service and I was going to use 350kmcm in parallel, my friend from a diffrent firm is telling me they used 300kmcm for one just recently. Now I am second guessing myself, so I am turning to you all.


Ob


Choose your customers, don't let them choose you.
Work Gear for Electricians and the Trades
Re: Wire for 600A 1Phase service [Re: Obsaleet] #185667
03/23/09 09:08 PM
03/23/09 09:08 PM
HotLine1  Online Content

Member
Joined: Apr 2002
Posts: 7,069
Brick, NJ USA
300KCMil Copper, 75 degree col is 285 amps,Based on 240.4 (B)parallel is 570 amps, next higher available is 600 amps.

300's work.


John
Re: Wire for 600A 1Phase service [Re: Obsaleet] #185668
03/23/09 09:14 PM
03/23/09 09:14 PM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
If in two seperate conduits 300 kcmil is good for 285 amps at 75c. see 240.4 (b) (800 amps or less next higest breaker size) .
240.6 300 next breaker size is 600.
285 plus 285 = 570
if in one single conduit see table 310.15(B)(2)(a)
4-6 80%
570x80%=456 next higest per 240.6= 500amp.
Same Conduit would require 400 Kcmil
335x2= 670 x 80%= 536 . 240.6 next higest 600
This is with 3 wires in conduit single phase. Or
6 wires in conduit single phase.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
253,254 Are you busy
189,891 Re: Forum
179,602 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 15 (0.004s) Memory: 0.9513 MB (Peak: 1.0768 MB) Zlib enabled. Server Time: 2019-02-19 19:11:47 UTC