Which table in the Code do you use for resistance for voltage drop calculations? Mike Holt's free voltage drop calculator uses Table 8 (dc resistance), but I usually use Table 9 (AC effective impedance at 0.85 pf). I've always thought that Table 9 is more accurate, because it takes reactance into account. This is for a 208V/3phase feeder from a xmfr to dist. panel.
Voltage drop calc -NEC Table 8 vs Table 9
- Thread starter jspak
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- Windsor, CO NEC: 2023
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- Hospital Master Electrician
I've always used Table 8.
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