Buck boost transformer

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svitak33

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Texas
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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
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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
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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:

EV Charger Voltage Range

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forums.mikeholt.com
 
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