bcm
Member
- Location
- Atlanta, Georgia
- Occupation
- Engineer
Happy Friday, Sparky Friends!
I have a client who wants to install a panelboard to feed some antenna rectifiers in a hotel building. The building has a 120/208V, 3 phase, 4000A service. The client refuses to tell me (or doesn't know?) if the rectifier equipment can accept 208V (I've been asking for over a month), so I can only assume it won't accept 208v.
They want to install a 120/240V, 200A, 1 phase panelboard with interlocked ATS (connected to a natural gas gen) to serve the rectifiers which require 2P breakers for each rectifier.
I would put in a 200A, 120/208V, 3ph breaker in the MDP, route the 5 wires (L-L-L-N-G) in conduit up to the roof level, and use a fused disconnect mounted near the panel.
At this point, I am trying to figure out the best way to handle the voltage change. I thought about using buck/boost, but going from 3 phase to 1 phase is going to leave one leg unused and thus potential for load balance issues, right? That's going to happen no matter what since they seem hell-bent on the 200A, 120/240V, 1 phase panel (probably because they already have it). I haven't dealt with this scenario before. Would I use a buck/boost transformer on each of the 2 legs going into the panel or is there a single transformer that could handle it?
Thanks for your input!
I have a client who wants to install a panelboard to feed some antenna rectifiers in a hotel building. The building has a 120/208V, 3 phase, 4000A service. The client refuses to tell me (or doesn't know?) if the rectifier equipment can accept 208V (I've been asking for over a month), so I can only assume it won't accept 208v.
They want to install a 120/240V, 200A, 1 phase panelboard with interlocked ATS (connected to a natural gas gen) to serve the rectifiers which require 2P breakers for each rectifier.
I would put in a 200A, 120/208V, 3ph breaker in the MDP, route the 5 wires (L-L-L-N-G) in conduit up to the roof level, and use a fused disconnect mounted near the panel.
At this point, I am trying to figure out the best way to handle the voltage change. I thought about using buck/boost, but going from 3 phase to 1 phase is going to leave one leg unused and thus potential for load balance issues, right? That's going to happen no matter what since they seem hell-bent on the 200A, 120/240V, 1 phase panel (probably because they already have it). I haven't dealt with this scenario before. Would I use a buck/boost transformer on each of the 2 legs going into the panel or is there a single transformer that could handle it?
Thanks for your input!
