Mitsubishi 700 Series Instruction Manual page 22

The line voltage drop can be calculated by the following formula:
3 × wire resistance[mΩ/m] × wiring distance[m] × current[A]
Line voltage drop [V]=
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop (torque
reduction) in the low speed range.
(2) Earthing (Grounding) precautions
Leakage currents flow in the inverter. To prevent an electric shock, the inverter and motor must be earthed (grounded). This
inverter must be earthed (grounded). Earthing (Grounding) must conform to the requirements of national and local safety
regulations and electrical codes. (NEC section 250, IEC 536 class 1 and other applicable standards)
Use an neutral-point earthed (grounded) power supply for 400V class inverter in compliance with EN standard.
Use the dedicated earth (ground) terminal to earth (ground) the inverter. (Do not use the screw in the casing, chassis, etc.)
Use the thickest possible earth (ground) cable. Use the cable whose size is equal to or greater than that indicated on page
12 , and minimize the cable length. The earthing (grounding) point should be as near as possible to the inverter.
POINT
To be compliant with the EU Directive (Low Voltage Directive), earth (ground) the inverter according to the
instructions on page 133.
1000
Wiring
2
13