Measuring 240v, 4 Wire Curcuit? - 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 03-08-2013, 01:39 PM   #1
Member
 
Join Date: Oct 2012
Posts: 83
Rewards Points: 75
Default

Measuring 240v, 4 wire curcuit?


Can I measure 240v on my meter? I can only get 120v, however, I do get 120 from each hot wire. I'm thinking this is right?

Advertisement

jclee is offline   Reply With Quote
Old 03-08-2013, 01:44 PM   #2
A "Handy Husband"
 
rjniles's Avatar
 
Join Date: Feb 2007
Location: South Carolina Low Country
Posts: 4,245
Rewards Points: 2,400
Default

Measuring 240v, 4 wire curcuit?


If you are measuring 120 from each hot to ground or neutral, but not 240 across the 2 hots, you have a problem.

The circuit is wired wrong or one leg is open and you are measing one side back thru the load.

Advertisement

__________________
Location:
Coastal South Carolina
rjniles is online now   Reply With Quote
Old 03-08-2013, 01:49 PM   #3
Member
 
Join Date: Oct 2012
Posts: 83
Rewards Points: 75
Default

Measuring 240v, 4 wire curcuit?


Quote:
Originally Posted by rjniles
If you are measuring 120 from each hot to ground or neutral, but not 240 across the 2 hots, you have a problem.

The circuit is wired wrong or one leg is open and you are measing one side back thru the load.
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together

Last edited by jclee; 03-08-2013 at 01:56 PM.
jclee is offline   Reply With Quote
Old 03-08-2013, 01:59 PM   #4
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 6,905
Rewards Points: 2,162
Default

Measuring 240v, 4 wire curcuit?


Quote:
Originally Posted by jclee View Post
I have not measured between black and red. I didn't think you could measure 2 hots together
THAT is your 240V.
__________________
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 offline   Reply With Quote
Old 03-08-2013, 05:15 PM   #5
A "Handy Husband"
 
rjniles's Avatar
 
Join Date: Feb 2007
Location: South Carolina Low Country
Posts: 4,245
Rewards Points: 2,400
Default

Measuring 240v, 4 wire curcuit?


Quote:
Originally Posted by jclee View Post
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together
As Speedy says, that is the only way you will measure 240.
__________________
Location:
Coastal South Carolina
rjniles is online now   Reply With Quote
Old 03-08-2013, 05:17 PM   #6
Member
 
Join Date: Oct 2010
Location: Cairns Australia
Posts: 2,725
Rewards Points: 2,410
Default

Measuring 240v, 4 wire curcuit?


Quote:
Originally Posted by jclee View Post
I'm getting 120v from black to ground/neural and 120v from red to ground/neutral

I have not measured between black and red. I didn't think you could measure 2 hots together
If both phases originate from the one hot line,
then you will measure nothing or close to it !

But if they come from different hot lines,
then you will measure 220 - 240v.

So yes you can measure across two hot lines !
Be very carefull, the mother of all bites awaits the unwary !
Death shortly after.
*CAUTION*

Advertisement

dmxtothemax 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
Ceiling fan and wire gauge needs? greentrees Electrical 6 05-01-2012 02:05 AM
240v questions.... ITSANSS Electrical 16 05-11-2011 06:40 PM
Box fill and wire nuts zephed666 Electrical 7 05-02-2011 01:51 PM
Changing Two Gang Outlet to Three Gang Outlet vbullinger Electrical 9 01-10-2011 06:13 PM
HVAC three wire motor to six wire motor Leo Caproni HVAC 5 10-18-2010 02:23 PM




Top of Page | View New Posts