ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Ground fault remover :-)
by NORCAL - 01/16/21 10:29 AM
Can I ask for your input?
by Roger_Dunn - 01/15/21 04:47 AM
Photo Editing Software?
by grich - 01/13/21 11:18 AM
From an outsider- How does tipping work?
by HotLine1 - 01/04/21 01:45 PM
Happy New Year Folks!!!
by Trumpy - 01/04/21 05:46 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
1 registered members (Trumpy), 20 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Pull box size #212297 12/29/13 02:15 PM
Joined: Dec 2013
Posts: 2
Z
zapped2012 Offline OP
New Member
what size pull box would I need if I have 3 4 inch conduits on one side and going out the back with 3 4 inch condits all having 4 600 mcms in them with a removable cover..
I came up with a box of 36x36x8 please help??

2017 / 2014 NEC & Related Books and Study Guides
Re: Pull box size [Re: zapped2012] #212301 12/29/13 03:14 PM
Joined: Jul 2007
Posts: 1,335
S
sparkyinak Offline
Member
Good morning and welcome to the board. Unfortunately my code book is at the office but if you have a code book handy, it will be in chapter 3 under pull boxes


"Live Awesome!" - Kevin Carosa
Re: Pull box size [Re: zapped2012] #212304 12/29/13 03:19 PM
Joined: Apr 2002
Posts: 7,225
HotLine1 Offline
Member
First...Welcome to ECN from one of the "Jersey Guys"!!

Based on 314 and reference back to 312.6(a) for the removable cover, you got it.

That said, think about the actual layout you intend. The 8" depth may be a battle with the 600s, as the 36" side to side space. Keep in mind the result of the 314/312 calcs is the 'code minimum', and not the "ultimate" answer.

You may decide on a 40" or 48" x 12" box.....think ease of install, possible labor savings, and 'for sure' code compliance.


John
Re: Pull box size [Re: zapped2012] #212317 12/29/13 11:56 PM
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
You make this sound like it's a test question.

36" is w a a a y too long if you're going in one face -- and plunging out the back side. "and going out the back"

600 kCMIL is brutally stiff -- even in aluminum -- so I could never recommend going with 8" as a depth.

You are not providing ANY of the circumstances that would dominate my own can sizing -- which is never predicated upon the NEC minimums. (I never, ever, attempt to squeeze (feeder) conductors into spaces so tight.)

Lowest cost means that the actual installation goes off without a hitch. That will not happen with NEC minimums. Tight space takes extra time... sometimes amazing amounts of extra time.

The NEC permits 9 #12 THHN in 1/2" EMT. Only a fool would design to such a scheme. Five #12 is the maximum that one would want to run in 1/2" EMT. Nine #12 -- going through four full nineties -- may require use of a power tugger. Yes, it can get that bad. Pulls like that cause the back injuries so common to electricians.







Tesla
Re: Pull box size [Re: zapped2012] #212326 12/30/13 03:31 PM
Joined: Dec 2013
Posts: 2
Z
zapped2012 Offline OP
New Member
Just need to see if i was right not a test what size would you use Thanks for your help

Re: Pull box size [Re: zapped2012] #212460 01/09/14 12:19 PM
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline
Member
2011 NEC 600 Volts & under . 314.28 A (2).
6 x 4 =24 + 8 = 32 inch by 32 inch.
Depth see 314.28 A (2) exception .
That refers you to 312.6 (A). 70-175.
Wire per terminal 3.
600-700 wire per terminal = 12 inch Depth.

As Said by others . that is Minimum size!
If you ever pulled 600 mcm you would NOT use
minimum size.



Last edited by Yoopersup; 01/09/14 12:23 PM.
Re: Pull box size [Re: zapped2012] #212465 01/09/14 04:04 PM
Joined: Apr 2002
Posts: 7,225
HotLine1 Offline
Member
Yoop;
Truer words have not been spoken!!!


John

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
Trumpy
Trumpy
SI,New Zealand
Posts: 8,373
Joined: July 2002
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 14
NORCAL 9
Popular Topics(Views)
273,889 Are you busy
207,630 Re: Forum
195,369 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3