4. Connecting the load
4 - X Cables to be used
Selection of cables:
Use cables having sufficient size in consideration of the allowable current of the cables and
the distance between the machine and the load.
If the load current exceeds the allowable current of cables, the cable may be damaged by
overheat. Also, if the cables are too small in size for the length, the input voltage of the load
drops which lowers the working efficiency or causes failure in operation.
Select the length and size of cable so that the voltage drop "e" obtained by the following
equation is within 5% of the rated voltage.
* Equation to obtain 3 - phase, 3-w ire system voltage drop "e" from the length and size of
cable and operating current is as follows.
e
where e: voltage drop (V) L: length (m)
S; cable thicknessfmm 2) I: load current (A)
Cable length L (m)
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