HoosierSparky
Senior Plans Examiner, MEP
- Location
- Scottsdale AZ
- Occupation
- Senior Plans Examiner
I am starting to get a migrane looking at a one line that has me scratching my head.
I have a system that begins at an SES (208/120) with a 200a 3phase disconnect feeding a 75kva single phase 240/120v to 2400v transformer. From there, two separate feeders of #2 15KVA Okoguard "URO-J" Al jacketed cable with full neutral in PVC conduit go to 2 37.5KVA 2400v/240v single phase transformers. These each feed a 100a MCB panels.
All transformers have an internal "Loadbreak switch".
Looking at this, I start thinking 450.3 and Table 450.3(A). None of these are supervised locations.
The BIG question is, should there be a disconnecting means at the 75KVA transformer for each feeder to the 37.5 transformers or at each in addition to the "coordinated thermal overload protection that is integral to the transformers? :?
I have a system that begins at an SES (208/120) with a 200a 3phase disconnect feeding a 75kva single phase 240/120v to 2400v transformer. From there, two separate feeders of #2 15KVA Okoguard "URO-J" Al jacketed cable with full neutral in PVC conduit go to 2 37.5KVA 2400v/240v single phase transformers. These each feed a 100a MCB panels.
All transformers have an internal "Loadbreak switch".
Looking at this, I start thinking 450.3 and Table 450.3(A). None of these are supervised locations.
The BIG question is, should there be a disconnecting means at the 75KVA transformer for each feeder to the 37.5 transformers or at each in addition to the "coordinated thermal overload protection that is integral to the transformers? :?