1.14
EARTH GROUNDING PROCEDURE
1.
The customer is to provide and install a ground rod approx.. .60 (15mm) diameter, copper clad steel, to be driven
no less than 8’ (2.5m) into the ground, no more than 10’ (3m) away from control enclosure.
2.
The ground rod is to be connected to customer’s in plant ground system. This connection shall be made directly
at the ground rod. (If applicable).
3.
It is desirable that the overall resistance to ground measured at the ground rod does not exceed 3 ohms. Cus-
tomer is advised to consult local power company for further information on grounding.
4.
The ground rod is to be connected to the ground terminal in the control enclosure using insulated, stranded 8
gauge copper wire.
5.
An additional point to check is to ensure continuity of all ground within the control enclosure. Start with the main
power entrance ground terminal where the internal ground conductors should originate and then connect to, the
DIN terminal strip, control transformer, and the lid of control enclosure. Also, the PLC and Interface units should
have their own ground conductors connected to one of the main ground terminals.
6.
A properly functioning ground system will:
-
provide safety for personnel.
-
ensure correct operation of electrical/electronic apparatus.
-
prevent damage to electrical/electronic apparatus.
-
help dissipate lightning strikes.
-
divert stray radio frequency (RF) energy from electronic/control equipment.
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