#### CPorter

##### Member

- Location
- Plano, Texas

Oncor tells me two buildings we are to lease are fed by three single phase 500KVA transformers rigged to supply 208vac three phase. They say this is good for 2000 amps.

Lighting loads are 3.5va/sqft = 50,000*3=150KVA by 200.12 and demand is 100% by 220.42

Receptacle loads in 200.14(I) & (K) amount to 1VA per sqft with demand (220.44) at 100% for the first 10KVA and 50% after. At 50,000 sqft thats 10kva + 20kva =30KVA.

Gathered the name plate data from the AC units I have 1092.3 amps total from the 3 phase units and 383 amps total from single phase units. Don't know what demand factor to use but experience from repairing ac unit tells me they run pretty close to FLA during the summer 100+ degree days.

We want to run a data center on this and right now it draws about 320 amps per phase.

The lighting load appears to run 420 amps per phase.

The receptacle load appears to run about 83 amps per phase.

The AC loads are about 280 amps per phase for the 208V single phase stuff and 1092 for the three phase stuff.

Max calculated load on any one phase is about 1875 amps without the data center and 2225 amps with it.

2225*208*1.73/1000 = 800KVA for the transformer minimum.