The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
International Wire Colour Codes
by Texas_Ranger
Today at 03:29 PM
Looking for older post
by Texas_Ranger
Today at 03:22 PM
Safety at heights?
by gfretwell
Today at 02:19 AM
Last time to chat here
by Trumpy
Yesterday at 11:41 PM
Unsafe Situations
by Trumpy
Yesterday at 09:46 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 35
HotLine1 20
Trumpy 19
Ruben Rocha 17
gfretwell 16
Who's Online
0 registered (), 77 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#97959 - 04/19/06 03:09 AM Air Compressor Nameplate
Frank Cinker Offline
Member

Registered: 07/29/01
Posts: 317
Loc: Pennsylvania
Re: Sizing overcurrent protective devices, disconnects and wire. 5 HP 230 volts, single phase bolted to the floor air compressor. The nameplate amps = 23. Using the proper table in article 430, amps = 28. My question is: Is the air compressor considered an appliance thus should article 422 be used? I used to always use the amps listed in the tables in article 430. However, I believe the air compressor could be considered an appliance and the nameplate amps could be used.

Top
2017 / 2014 NEC & Related Books and Study Guides
#97960 - 04/19/06 06:56 AM Re: Air Compressor Nameplate
earlydean Offline
Member

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
Frank,

Yes it is an appliance, but, look at 422.3:
"The requirements of Article 430 shall apply the the installation of motor-operated appliances..."
and 422.12(G): "Motors of motor-operated appliances shall be provided with overload protection in accordance with Part III of Article 430."
We use the nameplate for the overload (heaters) protection, and the tables from Article 430 for the short circuit and ground fault protection, and choosing the size of the conductors and disconnects.
_________________________
Earl

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals