ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
fuse rejectors
by gfretwell. 03/23/17 01:12 PM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
TRUE POWER
by jraef. 03/21/17 09:13 PM
WEG CFW-11 Frequency Inverter
by jraef. 03/21/17 08:50 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,263 Are you busy
165,977 Re: Forum
160,489 Need opinion
Who's Online Now
0 registered members (), 49 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#189090 - 09/18/09 07:15 PM Gas furnace MCA and MOCP  
jem  Offline
New Member
Joined: Apr 2007
Posts: 8
nc
I have been coming accross these Heil brand gas furnaces that do not have the MCA and MOCP on the nameplate. They list the maximum input current which I think is what the unit is rated. How do I calculate these values.


2017 / 2014 NEC & Related Books and Study Guides

#189091 - 09/18/09 07:25 PM Re: Gas furnace MCA and MOCP [Re: jem]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
This usually applies to HVAC compressors. Does this furnace have anything more than a blower, igniter and some controls?
When in doubt use 310.16 and 240.4(D)


Greg Fretwell

#189106 - 09/19/09 02:09 PM Re: Gas furnace MCA and MOCP [Re: gfretwell]  
jem  Offline
New Member
Joined: Apr 2007
Posts: 8
nc
There is also a small combustion blower.


#189109 - 09/19/09 04:31 PM Re: Gas furnace MCA and MOCP [Re: jem]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Look at the manufacturer's installation guide for the furnace. Usually they will tell you what size circuit. Some even tell you what size wire to run and depending on the length of the run they may have you increase to the next size wire. I'm seeing some of your larger furnaces specify a 20a. circuit.


George Little


Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 15 (0.003s) Memory: 0.7576 MB (Peak: 0.8902 MB) Zlib enabled. Server Time: 2017-03-24 00:08:35 UTC