Maryland Cherokee Club
CF Veteran
Joined: Dec 2011
Posts: 1,140
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From: Near the airport by the water
Year: 1999
Model: Cherokee
Engine: 4.0
Any electricians that deal with 480V 3 phase power?
Normally, where I work, if you measure power at 480 to ground you should get 270. Measuring phase to phase you should get 480.
Measuring between phases I am getting 480 but here is what I get when I measure to ground.
L1 to ground measuring 480
L2 to ground measuring 0
L3 to ground measuring 480
Normally, where I work, if you measure power at 480 to ground you should get 270. Measuring phase to phase you should get 480.
Measuring between phases I am getting 480 but here is what I get when I measure to ground.
L1 to ground measuring 480
L2 to ground measuring 0
L3 to ground measuring 480
Moderator of Jeeps
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From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
CF Veteran
Joined: Aug 2011
Posts: 1,035
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From: Mt. Rainier, MD
Year: 1999
Model: Cherokee
Engine: 4.0
Originally Posted by brian0128
Any electricians that deal with 480V 3 phase power?
Normally, where I work, if you measure power at 480 to ground you should get 270. Measuring phase to phase you should get 480.
Measuring between phases I am getting 480 but here is what I get when I measure to ground.
L1 to ground measuring 480
L2 to ground measuring 0
L3 to ground measuring 480
Normally, where I work, if you measure power at 480 to ground you should get 270. Measuring phase to phase you should get 480.
Measuring between phases I am getting 480 but here is what I get when I measure to ground.
L1 to ground measuring 480
L2 to ground measuring 0
L3 to ground measuring 480
Your B phase might be grounded.
Last edited by wormdrink; Nov 29, 2012 at 12:41 PM.
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
CF Veteran
Joined: Dec 2011
Posts: 1,140
Likes: 0
From: Near the airport by the water
Year: 1999
Model: Cherokee
Engine: 4.0
A generator for an x-ray machine. I'm searching on the internet and it sounds like I have a Delta configuration at the transformer. What I can't figure out is what readings I should be seeing on my meter when I measure.
Our facilities guy sent me an email saying:
The 480 volt in question is a Delta configuration and not a Y which mean the center (B) phase is a ground or neutral depending on how you look at it, so what you would have L1-L2 = 480, L1-L3 =480 and L2-L3 =480v. but to ground you would read the following L1(A phase)-Grnd = 480v, L2 (B phase) - Grnd = 0 and L3 C phase-Grnd = 480v. Also our 480v is three wire with a ground and no neutral.
Last edited by brian0128; Nov 29, 2012 at 12:52 PM.
CF Veteran
Joined: Feb 2012
Posts: 6,468
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From: Forest Hill, Maryland
Year: 1998
Model: Cherokee
Engine: 4.0L
I really need to get the heat fixed in the blue XJ....I want to drive with the LSD in the snow instead of the open diff in the white one....
