ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
nec 110.3 (B)
by gfretwell - 09/22/21 11:11 PM
Grounding electrodes
by gfretwell - 09/07/21 03:41 PM
Looking For Electricians in the Midlands
by Alex247 - 09/06/21 05:26 AM
New in the Gallery:
Now you know.
Now you know.
by Tom_Horne, September 7
February, North East Indiana
February, North East Indiana
by timmp, July 25
Who's Online Now
1 members (HotLine1), 46 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
Hey guys thanks for the help on these little issues I
run into. I want to use NEC 300.3 (C)(1)
"Conductors of ac and dc circuits rated 600 volts ,nominal, or less, shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway. all conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable or raceway."

The voltage is 120/240 a.c. and I want to install the start and alarm conductors in the same J-box box as the power. The alarm cable specified is rated for 300 v. dc.
300.3 (C)(1) only refers to the voltage rating so I'm thinking it's OK even though the alarm conductors are only rated for dc. Right?

2017 / 2014 NEC & Related Books and Study Guides
Joined: Mar 2003
Posts: 849
Y
Member
Read Informational Note #1 .

Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
Thanks Yoop. I did see that but the fact that the cable met the voltage requirement but was only rated for DC is what was throwing me off. I usually separate everything but when the GC stubbs the conduits out of the concrete wrong I end up having to make things work. I don't encounter much low voltage and Article 725 still confuses me. One of the things I don't understand is how to accurately classify the circuits when you don't know what the attributes of the power source are in the equipment that is powering them. Is there an easy way to determine that or is it involved?

Last edited by wewire2; 03/27/13 02:05 AM.
Joined: Jul 2007
Posts: 1,335
S
Member
What kind of alarm?


"Live Awesome!" - Kevin Carosa
Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
For this installation it was generator failure alarms.

Joined: Mar 2003
Posts: 849
Y
Member
725 breaks down each. Class 1/2/ & 3. Take a look.

Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
Haha! Got it! I knew I somehow must be missing a step. Totally makes sense now.

Joined: Jul 2007
Posts: 1,335
S
Member
Sometimes, that all it takes. Better to talk it out now then have something to smoke out later and get clarity later...


"Live Awesome!" - Kevin Carosa

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
HCE727
HCE727
Delaware County, PA, USA
Posts: 187
Joined: November 2005
Top Posters(30 Days)
timmp 3
FGBY 2
Popular Topics(Views)
283,041 Are you busy
216,770 Re: Forum
203,168 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5