Calculating Voltage Drop

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Dear

VD % = 1.73*full load current I *( R cos Φ + X sin Φ ) *100*cable length / nominal voltage V

Regards

Aiman

Dear

VD % = [ 0.2* load current (amps) *cable length(m) *nominal voltage (Volts)] /

full capacity rated currentcable (amps) volts. : for 1 cable and 3ph 4w

balance Loasd, But on single phase or dc must be double or *2,and*1.7

for 3ph 3W

or

VD % = Load current (amps) * (cable spacific resistivity/m) * cable length(m)

remark1: cable rated current, cable specific resistance and volatage drop formular

can see factory book table! or cable catalog.

remark2: cable rated current (amps) comment from current which apply on cable at

100m length until apear voltage drop 2% of naminal voltage (Line-nuetral

or ground voltage (0 volt))

remark3: cable rated current (anps) or current duration can be comment from cable

temperature rise 5 c-degree from 25 c-degree on free air or not more 40

c-degree in conduit or wire way (close cable trend)

remark4 cable rated current (anps) or current duration can be comment from cable

temperature at 25 watt / Kg for enamale insulated wire for coil or electric

machine such as motor, gennerator and transformer

All concludsion: are the same result but different spacific comment reson.

Regard

S. Sudkaew

13/6/2008