Mazak VTC-160A, Maintenance Manual, Page: 12 / 96

• WIRING
1) Use only electrical conductors with
performance ratings equivalent or superior.
2) Do not connect any power cables for devices
which can cause line noise to the power
distribution panel, such as arc welders and high
frequency machinery.
3) Arrange for a qualified electrician to connect
the power lines.
4) Incoming supply voltage should not deviate
more than ±10% of specified supply voltage.
5) Source frequency should be±2 Hz of nominal
frequency.
[ CAUTION ]
VERIFY THE ACTUAL MACHINE ELECTRICAL
POWER REQUIREMENT AND THE MAIN
TRANSFORMER RATING (IF APPLICABLE), AS
WELL AS THE LOCAL ELECTRICAL CODE
BEFORE SIZING AND INSTALLING THE
INCOMING POWER WIRING.
PLEASE SEE THE ADDITIONAL CAUTIONS ON
THE FOLLOWING PAGE.
• GROUNDING
1) An isolated earth ground with a resistance to
ground of less than 100 ohms is required.
Typically, a 5/8” copper rod, 8 feet long, and
no more than 5 feet from the machine, is
sufficient. Building grounds or multiple
machines grounded to the same ground rod,
are not acceptable.
2) The wire size should be greater than AWG
(American Wire Gauge) No. 5 and SWG
(British Legal Standard Wire Gauge) No. 6.
Desirable Independent Grounding:
N C
Earth resistance:
Machine
Less than 100 ohms
Common Grounds:
Resistance to ground
= 100 ÷ the number of
devices connected to
the grounding (ohms)
Note: Never ground equipment as shown below:
000X713-KY 11/98
S-6
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