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#11941 - 07/27/02 08:14 AM Wild Leg
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
In a 3 Phase service I have seen 240v between phases and a 208 to ground wild leg, What are some other combinations and where do they use the wild leg?
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#11942 - 07/27/02 09:26 AM Re: Wild Leg
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Search for high leg (27 hits) or 4-wire delta (4 hits) at this site.

Note that “Bø” {or sometimes Cø} can also be called Stinger / Red / Orange / Purple / Power / Wild / Bastard / High Leg

Read through Scott35’s 3 Phase Delta Transformer Schematics in Technical Reference Area of this board.

Also see: home.att.net/~benmiller/elecsys.htm

Utility availability of this service type is usually limited to small, remote overhead systems.

Other non-symmetrical 3ø configurations are the corner-grounded variety.




[This message has been edited by Bjarney (edited 07-27-2002).]

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#11943 - 08/02/02 08:26 AM Re: Wild Leg
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
I was unable to find any data in the technical Reference area.
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#11944 - 08/02/02 09:38 AM Re: Wild Leg
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Al,

Did you set the selection to see all topics?
We are working on a way to have them continuously visible regardless of date, but this works for now. Look at the thread in that area for Instructions if you're not sure what I mean.

Bill

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#11945 - 08/02/02 04:08 PM Re: Wild Leg
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Yep, I tried that, no subjects come up.
_________________________
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#11946 - 08/02/02 04:22 PM Re: Wild Leg
George Corron Offline
Member

Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
Alda,
The wild leg is ONLY useful in configurations that do not require a neutral, such as 3 phase equipment, or 240 volt loads with no neutral, otherwise you burn it up.

You ONLY have a high leg in Delta systems (open or closed) because you tap mid phase of one coil (between A and C)

That's why the Wye is the popular form today, it creates no high leg and all 3 phases are useful with the neutral.

You often see 199 volt high legs, this is from 230 volt systems. Phase to ground voltage of A or C phase X 1.732 = phase to B voltage.

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#11947 - 08/02/02 04:57 PM Re: Wild Leg
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Al,

Take a look to see if this is what you are looking for.
http://electrical-contractor.net/ubb/Forum15/HTML/000054.html

Bill

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#11948 - 08/02/02 05:49 PM Re: Wild Leg
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
'Wild leg' is no longer the term i like.

Has you ever yelled out

got the WILD LEG'

in a crowded store or mall???

[This message has been edited by sparky (edited 08-02-2002).]

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#11949 - 08/04/02 12:22 AM Re: Wild Leg
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Thanks for the answers, Bill great transformer drawings, but still not sure where they are used. On a 3ph system 240v between phases and measuring "120v to grd, 120v to gnd, and 208 to gnd", where would the 208v to gnd be used?
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The Golden Rule - "The man with the gold makes the rule"

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#11950 - 08/04/02 05:20 AM Re: Wild Leg
electric-ed Offline
Member

Registered: 07/08/02
Posts: 184
Loc: Canada
Aldav53,

The high leg (208 to ground) exists as a result of the center tap, but is not used to supply loads.

Ed

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