400V 50HZ Motor
I have an overseas project that involves a 10 HP motor (fire pump) on a three phase, 400 volt, 50 hertz system. I am sizing the conductors and OCPD. Table 430.250 does not cover this voltage level. Article 406.1(A) does not give me the freedom to interpolate the tabulated values, but absent any other resolution, that is what I will do. I donít have access to the motor yet, so I canít go by the nameplate. Anyone have an information source I can tap?
Charles E. Beck, P.E., Seattle
Comments based on 2014 NEC unless otherwise noted.