Greg and John;
Thanks for the replies!!!
Per John's last message:
how often do you design or work on a single phase, 400 amp, 120/240 service and install an undersized neutral?
The last 1 Phase 3 Wire 400 Amp Residential Service, where I performed any design or installation tasks upon, was in Late September of 2000; and that was an Underground Service Entrance!
We supplied and installed the Duct;
PoCo supplied, installed and terminated the Service Lateral Conductors.
PoCo (SCE) installed (2) 250 MCM XHHW Al., and (1) 2/0 XHHW Al.
IIRC, the Demand Load was around 250 Amps. That Load Calc is floating somewhere in my Archives, and likely is covered by a 1 Inch layer of Dust!
More to the point, I have never installed, nor designed, any 120/240V 1 Phase 3 Wire Service Entrance Conductors with a "Reduced Neutral".
Never saw a feasible benefit to going with that option, especially when an Overhead Service Entrance Feeder Set is - at most, 20 Feet in length!
-- Scott
