High Leg grounded conductor current?

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ronaldrc

Senior Member
Location
Tennessee
What would be the current on the grounded conductor with 5 amp. and 10 amp. loads as shown.

:)

[ September 01, 2003, 03:31 PM: Message edited by: ronaldrc ]
 
W

websparky

Senior Member
Location
Cleveland, Ohio
Re: High Leg grounded conductor current?

I'm thinkin' this is a trick question!

The "high leg" is never used as a single-phase source because no ground or grounded neutral exists for this circuit.
 
roger

roger

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Staff member
Location
Fl
Occupation
Retired Electrician
Re: High Leg grounded conductor current?

Ronald, I agree with Ed, it would be 10 amps.

The loads at the end of the center tapped winding would be cancelled leaving only the 10 amps from point X2 to grounded conductor. This would in essence be two windings in parallel at these two points.

There would be seperation of current flow between the windings but a total of 10 amps at either X2 or grounded conductor.

Roger

[ September 01, 2003, 08:10 PM: Message edited by: roger ]
 
R

ronaldrc

Senior Member
Location
Tennessee
Re: High Leg grounded conductor current?

Roger, I know maybe some of you thought I might have the correct answer for this.

But I think it would be 10 amps. also.

I looked at it as a completely balance single phase circuit and a 10 amp. load from X2 to X0.

I never invisioned it the way you describe it as two parallel circuits running from X2 to X0

I like that.

Ronald
 
roger

roger

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Staff member
Location
Fl
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Retired Electrician
Re: High Leg grounded conductor current?

Hey Ronald, some people walk across the street to get to the neighbors house, I have to go around the block. :D

Roger
 
B

bennie

Esteemed Member
Re: High Leg grounded conductor current?

After more thought I go for 10 amps. My reasoning is; A and C are balanced there is no neutral current. B phase with 10 amps will be the same on the neutral.

Maybe some do not regard this center tap a neutral conductor, but I think it meets the definition. It is not intended for B phase use.

B phase is only for 3 phase loads.
 
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websparky

Senior Member
Location
Cleveland, Ohio
Re: High Leg grounded conductor current?

Bennie,

Maybe some do not regard this center tap a neutral conductor, but I think it meets the definition. It is not intended for B phase use.

B phase is only for 3 phase loads.
Click to expand...
Exactly! B phase is only used when A and C phase are used for a 3 phase load. Therefore, the center tapped grounded conductor has no use and is never used with the B phase. Right?
The "high leg" is never used as a single-phase source because no ground or grounded neutral exists for this circuit.
 
B

bennie

Esteemed Member
Re: High Leg grounded conductor current?

Dave: That is my take on the subject. It has worked for 100 years and should be good for a few more.
 
B

bennie

Esteemed Member
Re: High Leg grounded conductor current?

The lighting winding X-1 to X-3 carries 2/3 of the single phase load plus 1/3 of the three phase load.

The power winding between X-1 and X-2, and X-3 and X-2, will each carry 1/3 of the single phase load plus 1/3 of the three phase load.
 
P

pattbaa

Member
Re: High Leg grounded conductor current?

What is the value of the Neutral current if the 5-amp load connected Black-to-White is removed from the circuit?
 
A

aleksonis

New member
Re: High Leg grounded conductor current?

FORMULA IS: NEUTRAL CURRENT=HIGH LEG+(L1-L2)THUS X=10+(5-5) OR 10 AMPS ON THE NEUTRAL.

[ December 16, 2003, 12:02 AM: Message edited by: aleksonis ]
 
engy

engy

Senior Member
Location
Minnesota
Re: High Leg grounded conductor current?

11.18 amps is correct.
The two currents are out of phase (can't use simple math)
 
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