ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Inspection camera help
by Bill Addiss. 09/19/18 10:50 PM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 20 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Overload Protection for Air Handlers #209973
05/20/13 01:26 AM
05/20/13 01:26 AM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 732
Tucson, AZ USA
In the Southwest virtually all 120 volt air handlers are plug and cord connected. For years we installed one of these:[Linked Image]

With all the newer units having built in motor overload protection it is my understanding that the fused receptacles are no longer needed/required. I believe this is also true of evaporative coolers.

Anyone have any input on this?

Work Gear for Electricians and the Trades
Re: Overload Protection for Air Handlers [Re: BigB] #209979
05/20/13 09:28 AM
05/20/13 09:28 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,024
Brick, NJ USA
Here furnaces and air handlers are hard wired; OCP is the branch circuit breaker and/or internal from the mfg.



John
Re: Overload Protection for Air Handlers [Re: BigB] #209981
05/20/13 10:31 AM
05/20/13 10:31 AM
G
ghost307  Offline
Member
Joined: May 2005
Posts: 951
Chicago Illinois USA
A lot of the furnaces in the Midwest have a similar device to the picture, but with a switch instead of a receptacle and the furnace itself is hardwired. A service tech told me that's so he can unscrew the fuse for LOTO instead of just hoping that the homeowner doesn't turn the c/b back on.


Ghost307
Re: Overload Protection for Air Handlers [Re: BigB] #210075
05/25/13 02:30 PM
05/25/13 02:30 PM
H
harold endean  Offline
Member
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
In a lot of the older homes around here, they used to use them for furnaces and boilers as well. Usually the service was 100 amp and fuses.

Re: Overload Protection for Air Handlers [Re: BigB] #210091
05/26/13 03:09 PM
05/26/13 03:09 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I've installed a few of those, as a way to give the equipment more appropriately sized over-current protection. I'd use an Edison-base breaker, rather than a fuse. Only problem is ... they didn't work out.

They didn't work out, as the first thing the HVAC guy did on his next visit was remove them, leaving an open box in place.


Featured:

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

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,149
Joined: May 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 9
Popular Topics(Views)
249,296 Are you busy
187,229 Re: Forum
176,589 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.018s Queries: 15 (0.003s) Memory: 0.9692 MB (Peak: 1.1098 MB) Zlib enabled. Server Time: 2018-09-20 03:41:07 UTC