ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Smoke & mirrors?
by HotLine1 - 09/21/20 03:42 PM
Pool Lights?
by Papa - 09/18/20 05:26 PM
Ever been afflicted by Gout?
by mbhydro - 09/15/20 05:50 PM
Questioning the electrical norms
by gfretwell - 09/13/20 01:17 PM
120/208 gives 240? please clarify
by NORCAL - 09/13/20 01:08 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 13 guests, and 6 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Electric Heat Help #80009 02/13/02 08:32 AM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
I will be installing electric baseboard heat in an attic/playroom conversion. 3 sections for 4500 watts (which equals 18.75 amps @ 240 v.)
424.3(B) requires 125% for branch circuit conductors and OCPDs. This comes to 23.4 amps. I plan to run a 30 amp circuit and I want to install a line voltage t-stat as opposed to low voltage relaying.
The problem is I can't locate a t-stat rated above 22 amps. This will handle the 18.75 amp load but I'm not sure if the t-stat is also required to be rated @ 125%. (23.4 amps)
Help, anyone?

2017 / 2014 NEC & Related Books and Study Guides
Re: Electric Heat Help #80010 02/13/02 04:38 PM
Joined: Dec 2001
Posts: 270
E
Elzappr Offline
Member
I would treat the t-stat like any other switch. See 380-14(a). The 22Amp t-stat is good for the 18.75Amp load. The wiring is sized no more than 80% so there will not be any heat buildup at the terminal screws, and there is no service factor, like in motors, to worry about with the resistive load.


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
RH1
RH1
California
Posts: 22
Joined: August 2009
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 8
NORCAL 3
Popular Topics(Views)
269,957 Are you busy
204,381 Re: Forum
192,599 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3