electricbiddr
Member
- Location
- Hillside, IL
Hello, I am calculating a load for a high rise floor approximately 22,000 square feet. I have calculated the lighting and receptacle load according to the 220.12 & 220.14. My results were extremely higher than the actual load readings. (we monitored the load for (1) week with current monitoring equipment.)
My question is that since the building has a separate system for HVAC and a separate system for EM lighting is there any deduction I can take for the reduction in load verses the calculated actual and square foot calc. which would take into consideration the fact that there are no heating or airconditioning loads on the service.
There are approximately 10,000 square feet occupied, 10,000 square feet vacant, and 7,000 square feet in elevator and common hallway space.
The service size is 800amps 120/208v
The actual current monitoring came up with an average of 115Aac per phase.
The calculated total load came up with 123kva total for lighting and receptacle load. Which is substantialy higher than the actual.
22,000 X 4.5w/sq ft = 99kva
323 each receptacle straps x 180va = 58,140va
10,000 100% demand
48,140va x 50% = 24,070va
99kva + 24kva = 123kva
We are going to submit this to the City for a proposal to add a 350A 3-meter fitting to subdivide existing tenant space.
I belive they will deny me based on the calculated load. But the actual load shows it is feasible.
My question is that since the building has a separate system for HVAC and a separate system for EM lighting is there any deduction I can take for the reduction in load verses the calculated actual and square foot calc. which would take into consideration the fact that there are no heating or airconditioning loads on the service.
There are approximately 10,000 square feet occupied, 10,000 square feet vacant, and 7,000 square feet in elevator and common hallway space.
The service size is 800amps 120/208v
The actual current monitoring came up with an average of 115Aac per phase.
The calculated total load came up with 123kva total for lighting and receptacle load. Which is substantialy higher than the actual.
22,000 X 4.5w/sq ft = 99kva
323 each receptacle straps x 180va = 58,140va
10,000 100% demand
48,140va x 50% = 24,070va
99kva + 24kva = 123kva
We are going to submit this to the City for a proposal to add a 350A 3-meter fitting to subdivide existing tenant space.
I belive they will deny me based on the calculated load. But the actual load shows it is feasible.