Siemens SINUMERIK 840D Maintenance Manual page 42

FADAL MACHINING CENTERS
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• intermediate metal conduit
• electrical metallic tubing or cable armor
4. One end of the supplemental grounding conductor shall be attached to the VMC's
ground bus. The other end shall be effectively bonded to a copper cold water pipe
that is in direct contact with the earth for 10 feet or more (See Figure 2-5: Bond
Grounding Conductor to Copper Cold Water Pipe).
5. Connections shall be made so that they are electrically continuous.
Figure 2-5: Bond Grounding Conductor to Copper Cold Water Pipe
WARNING!
Many problems that are difficult to diagnose can occur if the VMC is not properly
grounded. Proper grounding cannot be overemphasized.
PRE-INSTALLATION PROCEDURES MAN-0126_R1