208 Line To Neutral

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Seven-Delta-FortyOne

Goin’ Down In Flames........
Location
Humboldt
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EC and GC
Purely theoretical. Not a current project. Just my educational post of the day. 😳🤣

Say you have a single phase 208-230v motor.

And say you have a center-tapped delta service, 120/240, with a 208v stinger.

How would the motor react being supplied with 208 L-N, instead of 208 L-L?
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Generally speaking, the answer to any high-leg-to-neutral question is "no."

The issue is weird currents in the center-tapped secondary, not the motor.

The motor would neither know nor care about the source's arrangement.
 

retirede

Senior Member
Location
Illinois
Purely theoretical. Not a current project. Just my educational post of the day.

Say you have a single phase 208-230v motor.

And say you have a center-tapped delta service, 120/240, with a 208v stinger.

How would the motor react being supplied with 208 L-N, instead of 208 L-L?

In a case like that, I would connect the motor L-L (240V).
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Another issue is the circuit breaker, that is using a single pole with 208 volts. You would need to use something like a 277 volt CB.
 

norcal

Senior Member
208V L-N, will read a nominal 240V L-L, as long as a 2-pole breaker was used that was rated for 240V, not a standard 120/240V, like most breakers, the high leg and one of the other phases, could be used for 240V 1Ø
 

Seven-Delta-FortyOne

Goin’ Down In Flames........
Location
Humboldt
Occupation
EC and GC
Yea but I’m talking about a stinger leg

208V on a single pole breaker, L-N.

You’d need a 277V breaker.

High leg with any other phase just looks like any two phases.

On a center-tapped delta, any two phases will be the same.

Only the stinger to neutral will be different.
 
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