???...the secondary feeders would be derated to 80% because the neutral is current conducting...
???...the secondary feeders would be derated to 80% because the neutral is current conducting...
If a three phase transformer is a delta, there are three CCCs. If it is a wye there are four circuit conductors and the neutral would not be a CCC even for line to line loads unless non linear.That's what I was asking, just to check myself.
IF this was a 3-phase xfmr, which it isn't, then the secondaries would have four wires plus the e.g.: three lines and the neutral. Wouldn't the neutral be considered a current carrying conductor for pipe fill and, as such, require an .80 adjustment fill factor for deration?
If a three phase transformer is a delta, there are three CCCs. If it is a wye there are four circuit conductors and the neutral would not be a CCC even for line to line loads unless non linear.
Pipe fill counts all wires. Derating (ampacity adjustment) counts only CCCs.
And now, under the 2014, one also counts the spares. Surprised me.
ice
Spare conductors.Spares?