The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Massive power outage South Australia
by Meadow
Today at 06:46 AM
short circuit??
by Meadow
Today at 06:43 AM
Norwegian power?
by Meadow
Today at 06:36 AM
breaker meltdown
by sparky
09/27/16 07:30 PM
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 13
sparky 10
sparky66wv 8
gfretwell 8
Vlado 6
Who's Online
0 registered (), 113 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#188580 - 08/18/09 11:00 PM box fill
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.
A box contains:
a) wires of different sizes (for example #12 which requires 28.7 ml and #8, which requires 45.1 ml), and
b) a couple pairs of wire connectors, and
c) a flush mounted device of less than 2.54 cm,.

The #12 wires are connected to the #8 wires and the device is connected to a circuit with tails of #14 wire, which require 24.6 ml each, but aren't counted because they don't leave the box.

When I deduct the number of wire allowed in the box for wire connectors, can I reduce the number of #12 wires allowed? If the code doesn't specify, it must be my choice.

Can I deduct the #14 wire from the allowable fill, because the device is connected by that size of wire?

Top
2014 / 2011 NEC & Related Books and Study Guides
#188661 - 08/23/09 07:35 AM Re: box fill [Re: twh]
Eddy Current Offline
Member

Registered: 09/26/06
Posts: 112
Loc: Ontario,Canada
Only makes sense that the biggest wire be deducted. You have to use a bigger wire nut on bigger wire which takes up more space in the box.

Top
#188669 - 08/23/09 07:47 PM Re: box fill [Re: Eddy Current]
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals