The ground conductor connecting the ground stud to the ground rod should be 8 AWG or
larger.
When longer lengths are required, use a larger size cable, so that the resistance of the cable is less
than 0.075 OHMS. The ground conductor must be rated to carry peak short-circuited current for maxi-
mum time duration without degrading the ground system. The ground conductor must withstand any
mechanical abuse to which it may be exposed.
To establish an earth ground, the ground rod must be driven into the ground to a depth of eight feet.
If the bottom is encountered at a depth of less than four feet, the electrode may be buried horizontally
in a trench.
SYSTEM GROUND
A proper grounding arrangement prevents equipment damage and personal injury caused by an
electrical fault such as a short circuit. To accomplish this, the grounding setup must assure that all
voltages have the same reference base, and that in the event of an electrical fault, the voltage poten-
tial is limited.
All electrical circuits and all non-current carrying metal parts of the control and the machine tool are
interconnected by a series of ground wires attached to a ground bar located in the bottom of the power
case.
ELECTRICAL POWER CONNECTION
- CAUTION -
Customer must provide transformer protection per local code.
- NOTE -
Consult local electrical codes to determine the exact service and wiring
requirements. Local electrical codes will take precedence over the service and
wiring requirements presented below.
ELECTRICAL REQUIREMENTS
Recommended Minimum Incoming Wire Size:
2 AWG (35MM
2
cross-sectional area)
Recommended Wire Type:
Stranded Copper
Nominal Input Voltage:
400 (50 Hz) / 460 (60 Hz)
Steady State Input Voltage:
±10% of Nominal Input Voltage
Minimum Service Rating:
100 Amps
Maximum Voltage Unbalance:
2% Deviation
M-507C
1-35
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