Total load calculations

[sergiyny]

I have no problem calculating the total load when they're all in 480/277V or 208/120V. How do I come up with the total load when there's bunch of equipment in both 480/277V and 208/120V?

For example I have the following:

Pump - 21A, 480V, 3ph
Water Heater - 54KW, 480V, 3ph
Roof Top Unit - 56A, 480V, 3ph

Lighting - 130KVA at 277V

(3) Condenser - 15A, 208V, 3ph

(20) AHU - 1.5A, 208V, 1ph

Receptacles - 22KW at 120V

 

[lielec11]

I have no problem calculating the total load when they're all in 480/277V or 208/120V. How do I come up with the total load when there's bunch of equipment in both 480/277V and 208/120V?

For example I have the following:

Pump - 21A, 480V, 3ph
Water Heater - 54KW, 480V, 3ph
Roof Top Unit - 56A, 480V, 3ph

Lighting - 130KVA at 277V

(3) Condenser - 15A, 208V, 3ph

(20) AHU - 1.5A, 208V, 1ph

Receptacles - 22KW at 120V

Work in terms of power (kW or kVA). Power is additive across the board. 22kW is 22kW whether at 480V or 208V, the only thing that changes is the current.

 

[sergiyny]

Work in terms of power (kW or kVA). Power is additive across the board. 22kW is 22kW whether at 480V or 208V, the only thing that changes is the current.

Oh yeah that's right. For some reason the conversion from 208V to 480V went out of my mind, it gives you same answer. Thanks!