joebell
Senior Member
- Location
- New Hampshire
I was having a discussion with my boss on Friday about an installation of a 112.5 KVA delta/wye transformer in a computer server room. I guess the root question is about the sizing of the secondarys. My opinion is that the neutral/grounding conductor of this installation should be considered current carrying, due to the the loads being served are considered nonlinear, there for derating of the secondarys is required. I believe 600 KCMIL conductors should be installed.
He says the 3 phase 4 wire system neutral is not to be counted as current carrying and he thinks 500 Kcmil should be installed.
I would normally agree with his assement on the 3 phase 4 wire system but the loads are all computer room server equipment
Do we need to apply derating factors to these secondarys?
He says the 3 phase 4 wire system neutral is not to be counted as current carrying and he thinks 500 Kcmil should be installed.
I would normally agree with his assement on the 3 phase 4 wire system but the loads are all computer room server equipment
Do we need to apply derating factors to these secondarys?