Scott
Yes this is a Actual Installation.
10 kva 208 volt single phase primary 40 amp. OCP at building Secondary 480 volt single phase secondary. 3500ft. run out to a step dn transformer 10 kva .
Loads at second remote transformer 120 volt. So its 120/240 v. single phase.
I feel main not required at second transformer on primary
225.32 Exception #1.
Remote secondary (40)amp OCP required (240.21).then breakers feeding each circuit.
Secondary of remote transformer grounded per 250.30.
Voltage drop on long run requires #2 thwn, Phase conductors
plus equipment ground.
Equipment ground wire 250.122 .
Well a # 6 do it OR is a #2 equipment ground also required per 250.122(B)
10 kva at 480 volts = 20.8 amps
10 kva at 208 volts = 48 amps
load is 5.5 kva at 480 volts = 11.45 amps
load at secondary remote 22.9 amps
Thats what I come out with yer turn .
Yoopersup
