ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video door bell causing chime activation of coil
by crselectric. 12/16/18 02:12 PM
Our Company!
by faradaygroup. 12/15/18 09:23 PM
Pull out fuse panel?
by wa2ise. 12/14/18 05:09 PM
Conduit fill Calculations
by gfretwell. 12/08/18 08:39 PM
Swimming Pool question
by HotLine1. 12/05/18 12:37 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 3 guests, and 14 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  Offline

Member
Joined: Apr 2002
Posts: 7,050
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
TOOL_5150
TOOL_5150
Bay Area
Posts: 61
Joined: August 2007
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
252,245 Are you busy
189,203 Re: Forum
178,886 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.016s Queries: 15 (0.004s) Memory: 0.9518 MB (Peak: 1.0775 MB) Zlib enabled. Server Time: 2018-12-16 19:51:10 UTC