ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's all our Non-US folks doing?
by djk - 07/23/21 09:13 PM
Switched Receptacles -Top or Bottom?
by donles - 07/23/21 10:51 AM
Do You Travel?
by Bill Addiss - 07/20/21 04:26 PM
Backup Generator Done Right
by timmp - 07/18/21 12:20 PM
Square D "All-In-One" Panelboard
by Rachel - 07/16/21 04:57 AM
New in the Gallery:
OOPSIE!
OOPSIE!
by timmp, July 13
AT&T Office Thermostat, Summer
AT&T Office Thermostat, Summer
by timmp, July 13
Who's Online Now
0 members (), 5 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jun 2002
Posts: 35
M
MikeW Offline OP
Member
Does the NEC allow 24vdc wires to be run in the same conduit with 120vac conductors?

What code section(s)?

thanks

2017 / 2014 NEC & Related Books and Study Guides
Joined: Nov 2000
Posts: 2,148
R
Member
Mike,
Look at 300.3(C)(1), but make sure that you read the FPN that follows that section.
Don


Don(resqcapt19)
Joined: Jul 2004
Posts: 9,653
Likes: 2
G
Member
Just remember that when you mix voltages in an enclosure or raceway you lose any latitide you might have had for "low voltage" in art 725. Everything is now treated like line voltage.


Greg Fretwell
Joined: Aug 2001
Posts: 7,520
P
Member
300.3 contains a similar requirement for this situation to one we have here -- That all conductors must be insulated for the highest voltage present.,

Joined: Nov 2000
Posts: 2,148
R
Member
Paul,
You have to read and apply the FNP that follows the section that you have cited. The section doesn't really mean what it says.
Don


Don(resqcapt19)
Joined: Aug 2001
Posts: 7,520
P
Member
Oh boy, I hadn't even started to read 725 before now. The definitions for class 2 and 3 circuits seem overly complex. This section is going to take some studying. [Linked Image]

Joined: Jan 2003
Posts: 4,391
I
Moderator
Paul,

Quote
The definitions for class 2 and 3 circuits seem overly complex. This section is going to take some studying

I wish you well, you must be a gluten for punishment if you want to try to make heads or tails of 725. [Linked Image]

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: Jun 2004
Posts: 24
R
Member
I wonder wether there are some practical issues at play as well.Such as some current being imposed (through induction)on the DC circuit causing havoc with the circuits on the DC power run.
To be safe i would go with the rule of thumb of not combining one with the other.
Along the lines of even if it is permissable -should it really be done??


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
richard
richard
L.I. New York
Posts: 99
Joined: August 2003
Top Posters(30 Days)
timmp 4
Rachel 4
Popular Topics(Views)
281,393 Are you busy
215,034 Re: Forum
201,916 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5