jjmodoc1
Member
- Location
- High Point, NC
I am a licensed Electrician from North Carolina. BUT......I have never had to do any calcs with transformers or transformer OCPD. I need to do a design build without ever having stepped foot in the facility. All i have is a little info on the area in question. There is a 480v 3ph 225 amp panel on the wall in this area. Oddly enough there is nothing in the existing panel! The customer has an air compressor that needs to be set and wired. the air compressor specs are 50HP 208v 3ph 170fla. My thoughts, calculations, ideas, are as follows: PRIMARY SIDE: removing the existing 480v panel and in it's place i will put a 480v 3ph 200amp fusible disconnect with 175amp fuses feeding a 112.5 kva transformer. SECONDARY SIDE: off the transformer feeding a 208v 225amp 3ph disconnect with 225amp fuses feeding the air compressor.
Does all this seem right? I based OCPD on both sides at 125%. If anyone can help I would really appreciate it.
Does all this seem right? I based OCPD on both sides at 125%. If anyone can help I would really appreciate it.