Test Kitchen

[WSB123]

I need advice for sizing some transformers. I have a test kitchen that has two cooking sections in the same room. One section will have (4) 208v / 3Ph 17KW electric fryers. The second section has (3) of the same fryers and (2) 208 / 1 Ph / 2700 watt griddles. In addition to this is a walk-in freezer and cooler. I do not have exact specifications, just told 20 amp / 208 / 1Ph circuit needed for each.
This is the set up: Each "section" as I call it is actually a portable wall with a vent hood, suppression system, and the electrical outlets for the above listed appliances already installed. On the other side of this wall is a 225 amp MLO / 3 Ph Square D QO panel. All I am required to do is feed the panels, plus the branch circuits for the cooler & freezer.

The MDP is 480V. I am planning to install a 75 KVA transformer for the wall that only has the (3) big fryer loads and fusing it at 200 amps. I will feed the freezer & cooler from this same panel (I will be installing a 200 amp MB panel with feed thru lugs going to the wall panel and using the busbar to catch freezer / cooler circuits)
For the second wall, I am planning to install a 112.5 KVA transformer and fusing that panel at 225 amps. Is this overkill? I know in sizing commercial kitchens that I can calculate (4) appliances at an 80% demand factor based upon Table 220.56. However, I know when they start up initially all will be heating simultaneously. I also assume they may cycle at the same rate, or close to it. This is the reason for jumping to the larger transformer.
Thoughts / recommendations?

Thank you for your help

 

[ramsy]

..planning to install a 75 KVA transformer ..fusing it at 200 amps. I will feed the freezer & cooler from this same panel
..For the second wall, I am planning to install a 112.5 KVA transformer and fusing that panel at 225 amps. Is this overkill?

Not much room for expansion. Can't add appliances, nor supply refrigeration compressors from your MDP

Why not use one 225kva xfmr for both, may cost less, especially if both walls are in same room?

 

[MTW]

There should be some exhaust fans and air make up loads to go along with that kitchen lineup. Might want to inquire about that.

 

[WSB123]

Not much room for expansion. Can't add appliances, nor supply refrigeration compressors from your MDP

Why not use one 225kva xfmr for both, may cost less, especially if both walls are in same room?

I am just inquiring about pricing. I figured the two smaller transformers and not getting into purchasing a 400 amp panel would be less expensive. I will be looking into pricing today.

 

[WSB123]

There should be some exhaust fans and air make up loads to go along with that kitchen lineup. Might want to inquire about that.

There is one exhaust fan that will connect to both hoods. I did not mention it because it is only about 7 amps, calling for a 15 amp / 3P breaker. There is no make-up air. This is just in a warehouse space. There is also a standard residential grade 50 gallon water heater. There is already another 200 amp / 120-208 panel supplied by a 75KVA transformer, but most of the spaces are taken, but not a heavy load on it. I was going to pull the water heater from there.