Pepwr2011
Member
- Location
- New York, NY, USA
Hello All,
NEC code question.
Scenario:
I am in the process of developing a Elevator UPS rescue system. Basically in the event of a building power loss I am using a UPS to run one elevator at a reduced speed to the nearest landing to let the passengers out. Under the building power loss condition the UPS requires 5kVA of power to perform this task. Under normal building power the input of the UPS is connected to a secondary of 2kVA transformer. The UPS only requires 1.5kVA under this condition (charging current, providing power to the elevator control system, etc.). Under normal power condition the UPS does not provide power to the drive/motor hence does not need the total kVA of the UPS. I have properly sized the wires for the primary and secondary of the 2kVA transformer, UPS wiring, and fuse sizing for the primary of the 2kVA transformer.
Diagram:
460VAC Building voltage(Disconnect switch) ---------> (Fused on primary of transformer), 460VAC/240VAC (2kVA Transformer) ----------> (240VAC/240VAC) 5kVA UPS -----------> Elevator system.
Is there anything in the NEC code that I need to address having a 2kVA transformer connected to a 5kVA UPS?
Thank you for your time and feedback.
NEC code question.
Scenario:
I am in the process of developing a Elevator UPS rescue system. Basically in the event of a building power loss I am using a UPS to run one elevator at a reduced speed to the nearest landing to let the passengers out. Under the building power loss condition the UPS requires 5kVA of power to perform this task. Under normal building power the input of the UPS is connected to a secondary of 2kVA transformer. The UPS only requires 1.5kVA under this condition (charging current, providing power to the elevator control system, etc.). Under normal power condition the UPS does not provide power to the drive/motor hence does not need the total kVA of the UPS. I have properly sized the wires for the primary and secondary of the 2kVA transformer, UPS wiring, and fuse sizing for the primary of the 2kVA transformer.
Diagram:
460VAC Building voltage(Disconnect switch) ---------> (Fused on primary of transformer), 460VAC/240VAC (2kVA Transformer) ----------> (240VAC/240VAC) 5kVA UPS -----------> Elevator system.
Is there anything in the NEC code that I need to address having a 2kVA transformer connected to a 5kVA UPS?
Thank you for your time and feedback.