ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by annemarie1. 07/27/17 03:10 PM
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
Housebilding DIY wiring
Popular Topics(Views)
239,371 Are you busy
174,826 Re: Forum
167,217 Need opinion
Who's Online Now
0 registered members (), 38 guests, and 5 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#76426 - 01/30/01 07:59 PM 15A Switches  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Assuming #12 wire is being used, can one use 15 Amp snap switches on 20 Amp circuits assuming the load is less than 1440 Watts?
(80% of 15A @ 120V)

I don't like using #14 wire and I've always protected lighting circuits at 15A anyway; so can I put 20 Amp breakers in instead and still be code?

380-14a seems to point towards sizing for load rather than circuit protection...

But there's always a paragraph hiding in this book somewhere...


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

2017 / 2014 NEC & Related Books and Study Guides

#76427 - 01/30/01 08:33 PM Re: 15A Switches  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Yes, you can put 15 amp switches on a 20 amp circuit, provided the load does not exceed 15 amps.

There is no reason that I know, other than controlling a motor, to "Derate" your switch to 80% (12 amps).


Few things are harder to put up with than the annoyance of a good example.

#76428 - 01/31/01 12:41 AM Re: 15A Switches  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
NY, USA
'66,

Yes you can use 15 amp switches. I am kind of opposite in that I would prefer #14 on these 15 amp switches. It seems to me that getting the screw torque just right on (standard grade) 15 amp switches is tough. It's easy to overtighten and strip out the screws or if it's not tight enough you can watch the screws turn (loosen) as you push the device back into the box. I think 20 amp rated switches are a better match for #12 awg wire.

Bill


#76429 - 02/24/01 03:53 AM Re: 15A Switches  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Never had that problem with Leviton or Eagle brand devices...except for that time I used my DeWalt screw gun...live and learn!


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI


Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7603 MB (Peak: 0.8929 MB) Zlib enabled. Server Time: 2017-07-28 10:54:45 UTC