Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 12-17-2011, 11:08 AM   #1
Member
 
Join Date: Dec 2011
Posts: 108
Rewards Points: 75
Default

Box fill - Reliable calculators?


The various exceptions and writing of the NEC have me a bit tripped up on this.

Are there any ONLINE box fill calculator that someone cant point me to that are reliable/accurate?

The numbers I'm getting dont seem to match anything.


I have a 3 gang box with:
2 x 12/2 (4 x 2.25)
3 x 14/2 (6 x 2.00)
3 devices - 2 conductors each, so is it (6 x 2.25) or (4 x 2.25 + 2 x 2.00)?
internal clamps (2.25)
Largest ground (2.25)

So I've got: 9 + 12 + 13.5 + 2 + 2.25 = 39.00

http://www.constructionmonkey.com/ca...l/boxfill.aspx
Gives me 32.30

Where am I going wrong?


Last edited by fuzzball03; 12-17-2011 at 11:19 AM.
fuzzball03 is offline   Reply With Quote
Old 12-17-2011, 11:40 AM   #2
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,857
Rewards Points: 2,110
Default

Box fill - Reliable calculators?


I come up with 39.
The online calculator missed the ground wire, and missed on the # of devices.

__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is online now   Reply With Quote
The Following User Says Thank You to jbfan For This Useful Post:
fuzzball03 (12-18-2011)
Old 12-17-2011, 11:49 AM   #3
Member
 
Join Date: Mar 2011
Location: MA
Posts: 734
Rewards Points: 532
Default

Box fill - Reliable calculators?


It's not you. The calculator is only counting the devices as a single conductor.

I have a 3 gang box with:
2 x 12/2 (4 x 2.25)
3 x 14/2 (6 x 2.00)
3 devices - 2 conductors each (4 x 2.25 + 2 x 2.00) largest conductor connected to the device.
internal clamps (2.25)
Largest ground (2.25)

Should read: 9 + 12 + 13 + 2.25 + 2.25 = 38.5

Last edited by AandPDan; 12-17-2011 at 11:53 AM. Reason: math error - figures!
AandPDan is online now   Reply With Quote
The Following User Says Thank You to AandPDan For This Useful Post:
fuzzball03 (12-18-2011)
Old 12-17-2011, 03:22 PM   #4
Member
 
Join Date: Dec 2011
Posts: 108
Rewards Points: 75
Default

Box fill - Reliable calculators?


Great. thanks guys
fuzzball03 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
toilet takes to long to fill lonewolf22 Plumbing 5 11-30-2011 07:03 AM
To fill, or not to fill? IRuehl Landscaping & Lawn Care 7 08-27-2011 04:30 PM
toilet fill valve? Roundeye Plumbing 11 07-26-2011 01:17 PM
Would you spring to fill in your backyard? Piedmont Landscaping & Lawn Care 4 05-14-2009 08:14 PM
Building a shed, need help with pouring slab / fill ssybert Building & Construction 5 06-12-2008 06:19 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.