I am working on arc flash and short circuit calculations for a client. The facility is rather large with about 5 stories, 6 distribution boards, and about 50 branch panels. There is also an emergency system. The service main board is 480/277v 3-phase and about 3200a. The step-down voltage is 208/120 3-phase. Ther is no existing one-line.
I can easily create the one-line and get the breaker data, but the trouble I am having is determining the condutor length. The facility is older so most conduits are in the masonry structure and can't be visually traced or measured. I am looking for advise on how do figure out the conductor length. I can de-energize the facility so is there some type of electronics equipment, like a tracer, that will determine length? Thanks for any opinions.
I can easily create the one-line and get the breaker data, but the trouble I am having is determining the condutor length. The facility is older so most conduits are in the masonry structure and can't be visually traced or measured. I am looking for advise on how do figure out the conductor length. I can de-energize the facility so is there some type of electronics equipment, like a tracer, that will determine length? Thanks for any opinions.