120/240 Volt--general Question - Electrical - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 01-03-2012, 04:39 PM   #1
Newbie
 
Join Date: Aug 2011
Location: Chandler, AZ
Posts: 9
Rewards Points: 10
Question

120/240 volt--general question


I've seen references in books and on this forum to "120/240 volts", but I'm confused as to the meaning. Is there a circumstance where you would put in a "120/240 volt" circuit, or are circuits normally either 120 or 240 volts? I have no particular project in mind--just curious and haven't been able to find an answer. Thanks.

Advertisement

diyjunkie is offline   Reply With Quote
Old 01-03-2012, 04:44 PM   #2
Member
 
Julius793's Avatar
 
Join Date: Dec 2011
Location: New york
Posts: 1,053
Rewards Points: 500
Default

120/240 volt--general question


Quote:
Originally Posted by diyjunkie
I've seen references in books and on this forum to "120/240 volts", but I'm confused as to the meaning. Is there a circumstance where you would put in a "120/240 volt" circuit, or are circuits normally either 120 or 240 volts? I have no particular project in mind--just curious and haven't been able to find an answer. Thanks.
Each leg is 120 and will add to 240 then again every thing needs to be taken in context because people don't write what they mean.

Advertisement

__________________
Electricity will kill you if you give it a chance
Julius793 is offline   Reply With Quote
Old 01-03-2012, 04:47 PM   #3
A "Handy Husband"
 
rjniles's Avatar
 
Join Date: Feb 2007
Location: South Carolina Low Country
Posts: 4,225
Rewards Points: 2,360
Default

120/240 volt--general question


Most general purpose receptacles and lighting circuits are 120 volt (either 15 or 20 amps).

Some appliances like a water heater are 240 volt.

Some appliances like a kitchen range or a clothes dryer are 120/240 volt. The use the 240 for the heating functions and use 120 for things like timers and clocks.
__________________
Location:
Coastal South Carolina
rjniles is online now   Reply With Quote
Old 01-03-2012, 05:24 PM   #4
Newbie
 
Join Date: Aug 2011
Location: Chandler, AZ
Posts: 9
Rewards Points: 10
Default

120/240 volt--general question


Thanks for the replies. So a recepticle will be wired for either 120 or 240. If an appliance needs both, it would have two plugs. Right?
diyjunkie is offline   Reply With Quote
Old 01-03-2012, 05:26 PM   #5
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,899
Rewards Points: 2,152
Default

120/240 volt--general question


Quote:
Originally Posted by diyjunkie View Post
If an appliance needs both, it would have two plugs. Right?
No, it would have a 4-wire plug.
__________________
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.
Speedy Petey is online now   Reply With Quote
Old 01-03-2012, 06:51 PM   #6
Member
 
Join Date: Nov 2008
Location: North and East Texas
Posts: 79
Rewards Points: 105
Default

120/240 volt--general question


An appliance uses 4 wires like posted. One is a ground- this is not always present thus a 3 wire plug is sometimes seen and the neutral attaches to the case via a strap. One is the neutral. The other two prongs are both 120 volts.

To get both 240 and 120 V off the same plug, the appliance will only attach a connecting wire to one of the 120V lines and use the common neutral. The heating element (or motor or whatever needs the full 240V) would attach to both of the 120's. Thus one plug carries the supply for both the 240 needs along with the 120.

Last edited by Daltex; 01-03-2012 at 07:11 PM.
Daltex is offline   Reply With Quote
Old 01-04-2012, 11:27 AM   #7
Newbie
 
Join Date: Aug 2011
Location: Chandler, AZ
Posts: 9
Rewards Points: 10
Default

120/240 volt--general question


Thanks, all. This is scary! I actually think I understand this now!

Advertisement

diyjunkie is offline   Reply With Quote
Reply


Thread Tools
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
General flooring question bemgolf Flooring 2 12-08-2011 03:36 PM
Question about AFCI and Ontario code as well as some other general wiring queries drunken0monkey Electrical 5 06-15-2010 10:49 AM
general HVAC question wmmurphy HVAC 5 05-26-2010 12:50 PM
General Wall Swith Question Tim Electrical 4 04-12-2006 01:36 PM
Just a general question (drywalling) davidia1965 Building & Construction 4 09-13-2005 03:50 PM




Top of Page | View New Posts