Final answer:
The lighting feeder volt-ampere demand load for the office building is calculated by multiplying the number of receptacles per floor by the VA per receptacle, and then multiplying by the number of floors, resulting in a total demand load of 51,840 VA.
Step-by-step explanation:
To calculate the lighting feeder volt-ampere (VA) demand load for an office building, one must understand the implication of the given electrical distribution system. Each of the 48 receptacles per floor, assuming the standard 180 VA per receptacle for commercial buildings as per NEC (National Electrical Code), contribute to the total demand load. Given the building has six floors, the calculation for the total VA load is as follows:
- Multiply the number of receptacles per floor (48) by the VA rating per receptacle (180 VA).
- Multiply that number by the number of floors (6) to find the total VA demand load.
48 receptacles/floor × 180 VA/receptacle = 8,640 VA/floor
8,640 VA/floor × 6 floors = 51,840 VA
The lighting feeder for the building would then be designed to handle this calculated demand load of 51,840 VA.