ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
We have a system under design that uses 480V inverters connecting to a 208V service through a transformer. It just so happens that converting the inverter current using 480V/208V comes out to 401.5A, which bumps our OCPD up to 600A, which then makes us increase the conductor size. My question is this: Can I legitimately use the transformer efficiency to justify the current being less than 400A?