k_taylor
New member
- Location
- United States
The question I have is how do you apply 220.43 (NEC2011) when it comes to a lighting panel fed from a step-down transformer, which is being fed from a 480V system in your space.
I know the code doesn't limit the track length on a branch circuit and it clearly states the calculated (150VA per 2' of track) is to be added to the service or feeder supplying the store.
My question is: Should the feeder from the secondary side and the lighting panel (120/208V, 3ph) be sized based on the NEC track calculation or should you consider the system as a whole and that NEC track load calculation only apply to the incoming service to my space?
Should the transformer rating (i.e. 30kva, 45kva) be sized based on the NEC load (increased from track) or the Actual load that the transformer is feeding?
I know the code doesn't limit the track length on a branch circuit and it clearly states the calculated (150VA per 2' of track) is to be added to the service or feeder supplying the store.
My question is: Should the feeder from the secondary side and the lighting panel (120/208V, 3ph) be sized based on the NEC track calculation or should you consider the system as a whole and that NEC track load calculation only apply to the incoming service to my space?
Should the transformer rating (i.e. 30kva, 45kva) be sized based on the NEC load (increased from track) or the Actual load that the transformer is feeding?