Sparkologist4hire
Member
- Location
- United States
Hello
I am working on a project at a local hospital. The utility service is 240/120 3 phase 4 wire (high leg) and the emergency generator is 208Y/120 3 phase 4wire, 208v line to line and 120V line to neutral.
We are adding a new 150 amp 208Y /120v panel board for the IT server UPS and HVAC. The engineer is calling for (2) 5kva buck boost transformers, wired OPEN DELTA to convert the utility service to match the generator service before the new transfer switch.
The only response I got from the engineer from my RFI was the buck boost transformers are wired open delta.
This is the closest wiring diagram I can find and the engineer has given no more information than I have already typed. At best this looks like 120/240v 3 phase 4 wire service and it looks to me like the voltage from "A" phase to Neutral is still 200+ volts.
I am also concerned about the size of the buck boost transformers only being 5 kva and the service load is 150 amps.
I am working on a project at a local hospital. The utility service is 240/120 3 phase 4 wire (high leg) and the emergency generator is 208Y/120 3 phase 4wire, 208v line to line and 120V line to neutral.
We are adding a new 150 amp 208Y /120v panel board for the IT server UPS and HVAC. The engineer is calling for (2) 5kva buck boost transformers, wired OPEN DELTA to convert the utility service to match the generator service before the new transfer switch.
The only response I got from the engineer from my RFI was the buck boost transformers are wired open delta.
This is the closest wiring diagram I can find and the engineer has given no more information than I have already typed. At best this looks like 120/240v 3 phase 4 wire service and it looks to me like the voltage from "A" phase to Neutral is still 200+ volts.
I am also concerned about the size of the buck boost transformers only being 5 kva and the service load is 150 amps.