Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-13-2009, 12:49 PM   #1
Member
 
Join Date: Dec 2008
Location: Rhode Island
Posts: 141
Share |
Default

Proper way to hook up 240v outlet to sub panel?


Just wondering what is the proper way to hook up a 3 prong 240v outlet like a nema 6-50 using 6/3 with ground romex for a welder or air compressor to a 4 wire seperated neutral and ground bus sub panel.I know the black and red hot leads but do you use the white wire for the ground prong or do you use the smaller ground wire. I assume you use the white to the neutral bus and the ground to ground the box to the ground bus seeing as the box is metal.
Thanks for the help.

Plumbvoltage is offline   Reply With Quote
Old 01-13-2009, 12:57 PM   #2
Licensed Pro
 
Join Date: Mar 2007
Location: SC
Posts: 1,533
Default

Proper way to hook up 240v outlet to sub panel?


For a straight 240V receptacle (3 prong) you would not have a neutral, only two hots and a ground. If the 6/3 is already run, cap off the white at each end, connect the hots to the breaker and the bare copper to the grounding bus. If the wire has not been run, you can use 6/2 instead of 6/3.

__________________
"Life is hard. Life is harder when you're stupid." John Wayne
HouseHelper is offline   Reply With Quote
Old 01-13-2009, 12:58 PM   #3
Member
 
Join Date: May 2008
Location: Apple Valley, MN, USA
Posts: 995
Send a message via AIM to theatretch85
Default

Proper way to hook up 240v outlet to sub panel?


If the device truly is a 240 volt appliance and not 120/240 then the 3rd wire connects to the ground bar not the neutral. If it's 120/240 the plug should be a 4 wire plug, not a 3 wire. Most welders however are only 240 volts and do not require a neutral connection (just need an equipment ground).

The way I have always noted the plug configuration to be (in a 3-wire plug):
If the 3rd blade is flat its a 50 amp plug requiring a NEUTRAL connection to the 3rd blade. If its a right angle its a 30 amp plug requiring a NEUTRAL connection. If the 3rd blade is a round pin or a U shaped pin it is a ground only connection and usually amperage is determined by the configuration of the blades (size and position, etc).

4 wire plugs have both the neutral and ground pins in the plug, so the blade that is either flat or right angle in the middle is the neutral and then the pin that is either round or U shaped is the ground, leaving the remaining two conductors (on the outer edge) as the 2 hots.
theatretch85 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
240V Kiln Outlet to Air Conditioner Outlet artman Electrical 8 06-29-2008 06:21 PM
240v sub panel hook up with no neutral ut74 Electrical 7 03-07-2008 07:30 PM
100 amp sub panel hook up? ponch37300 Electrical 24 11-30-2007 11:47 PM
Electrical outlet hook up. helpless handyman Electrical 4 07-30-2007 08:18 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.