ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
2020 GFCI changes
by gfretwell - 06/06/20 04:41 PM
You will never guess
by gfretwell - 06/06/20 04:38 PM
Tinfoil-hat crowd is getting stupider...
by grich - 06/02/20 06:43 PM
Pool Lights?
by gfretwell - 06/02/20 11:53 AM
Norwegian power?
by WaterIngress - 05/27/20 11:43 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 12 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
raceway fill #53623 06/30/05 06:52 PM
Joined: Feb 2002
Posts: 56
D
drgnz23 Offline OP
Member
I having a discussion with one of the older guys about conductors in a 1/2 conduit. I look it up in the code book but its kind of confusing. For example (SIMPLE) 1/2 emt only 9 thhn wires .Is one of those a ground?

Work Gear for Electricians and the Trades
Re: raceway fill #53624 06/30/05 06:55 PM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
Member
The wire fill is a physical count of the wires in the raceway. What function the wires serve does not enter into this.
Don


Don(resqcapt19)
Re: raceway fill #53625 07/01/05 11:12 AM
Joined: Apr 2004
Posts: 349
Radar Offline
Member
This information is based on Table 1 in Chapter 9 of the NEC, which specifies maximum raceway fill:

53% max for a single conductor in the raceway (i.e. - grounding conductor)
31% max for two conductors
40% for 3 or more conductors

The unused volume of air space within the raceway is needed for cooling of the conductors which tend to warm up due to conductor heating caused by current flow thru the circuit conductors. Overstuffing a raceway, aside from making for a difficult pull, would contribute to conductor overheating by reducing the cooling medium.

Radar


There are 10 types of people. Those who know binary, and those who don't.

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 8
BigB 6
Popular Topics(Views)
266,275 Are you busy
201,089 Re: Forum
189,793 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3