I have an existing 3 phase 240/120B hileg switchgear (Delta - 4 wire). I want to provide some equipment with 480 VAC so I have specified a 240 Delta (3-wire) to 480 Y step up transformer to be connected to the switchgear. Is this compatible? I cannot find a reference in NEC stating that it's possible or not possible. Thank you.
240/120B Hileg Switchgear required to supply voltage to step up transformer
- Thread starter LMT
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- New Jersey
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- Journeyman Electrician
Sounds fine to me, since you're only using the 3Ø, 3 wire, 240 volt supply the transformer shouldn't care.
Welcome to the Forum.
Welcome to the Forum.
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- San Francisco Bay Area, CA, USA
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- Electrical Engineer
Just be aware that the transformer must be documented as being suitable for step-up use. Most are, but some old ones may not have the necessary documentation available if the mfr is no longer in business.
450.11.B
450.11.B
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