ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 27 guests, and 12 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#7347 01/31/02 09:12 PM
Joined: Jan 2002
Posts: 2
R
rodney2 Offline OP
Junior Member
600 A 208/120 what size and could I pair

Joined: May 2001
Posts: 176
W
Member
I assume this to be some commercial or light industrial service and that the calculations per Art 220 are in proper order. Then the lookup is in Art 310, Table 310-**, depending your application. My first guess is Table 310-16. Look down the 75 degree colume to 310Amps which is for a 350 kcMil copper cable, Type (as listed at the top of the column). Paralleling this cable brings you to 620 amps. Make temperature corrections, if required. You may use the 90 degree rating to accomplish this. Remember parallel cables must be cut to the exact same length.
YOu can use the same size neutral, or size it based on calculation in Art. 220-22.
The grounding electrode conductor is based on Table 250-66, equivalent area for parallel conductors, which would be a 2/0 copper conductor.
Hope this helps.

Joined: Nov 2000
Posts: 2,148
R
Member
Note that if the grounded conductor is sized per the Article 220 calculations that systems with very small calculated grounded conductor loads will have to comply with 250-24(b)(1) for the grounded conductor size.
Don(resqcapt19)


Don(resqcapt19)

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

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

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 812
Joined: April 2004
Top Posters(30 Days)
BigB 4
triple 3
Popular Topics(Views)
302,866 Are you busy
232,026 Re: Forum
216,767 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5