Wiring Main Circuit Terminals
2-
15
Ground Wiring
Observe the following precautions when grounding the MxC.
•
Always use the ground terminal of the 200 V MxC with a ground resistance of less than 100
Ω
and that of
the 400 V MxC with a ground resistance of less than 10
Ω
.
•
Do not share the ground wire with other devices, such as welding machines or power tools.
•
Always use a ground wire that complies with technical standards on electrical equipment and minimize the
length of the ground wire.
Leakage current flows through the MxC. Therefore, if the distance between the ground electrode and the
ground terminal is too long, potential on the ground terminal of the MxC will become unstable.
•
When using more than one MxC, be careful not to loop the ground wire.
Fig 2.14 Ground Wiring
Correct
Incorrect
