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Buck boost transformer

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svitak33

New User
Location
Texas
Occupation
Electrician
I have 208v 1ph being boosted to 240v. After installation I have 240v line to line. However, line to ground I have 120v on one line and 156v on the other. Is this normal?
 
ptonsparky

ptonsparky

Tom
Location
NE (9.06 miles @5.9 Degrees from Winged Horses)
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EC - retired
svitak33 said:
I have 208v 1ph being boosted to 240v. After installation I have 240v line to line. However, line to ground I have 120v on one line and 156v on the other. Is this normal?
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Yes. L-G means nothing to a load that is looking for L-L voltage.
You have also discovered why, when using BBs, you must be aware of any L-N loads and be sure to not use that phase afterwards. L-N.
 
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LarryFine

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
It happens because all of the voltage boost is being added at one end of the primary.

You could obtain balanced voltages if you split the secondary, like I mentioned here:

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