1.4
EARTH GROUNDING PROCEDURE
1. The customer is to provide and install a ground rod approximately .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.
Customer 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
copper wire. The wire gauge size is to be determined according to the electrical code of the customers
local electrical authority.
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.
To Next Page
Loading...
Need help?
General
