I am trying to get an estimate of the total current drawing for a lab.

I have the following plugs in the room:

480V, 20A , 3

**Φ**

208V, 33A, 3

**Φ**

120, 10A, 1

**Φ**

Assume all the outlets are in use. How can I estimate total current drawing??

My guess: Do single phase analysis since it is assumed to be all balanced loads, making total max current

**63A ?? I**know net phasor current is ZERO, but I am trying to get an estimate of max current drawing of the room.

Another guess: Add induvidual power from each connection, then walk back and get the current from source? HELP