the ground grid. For personnel safety it is recommended that the opposite side sheet is also
grounded. Ground connections should be made using #6 or larger. If there is ground pad is on
the roof, it should also be grounded to the side sheet.
8.3 Arrester Protection
ABB recommends that surge arresters be properly applied in the substation.
8.4 Control Power
Supply the control power as indicated on the wiring diagram. Verify connections for the heaters
before applying power. For breakers not equipped with DIN-Rail style connectors, check all
terminal block connections for proper tightness. For details of the overall control circuit, refer to
the specific wiring diagrams supplied with the breaker.
8.5 Final Inspection
Do not remove high voltage covers unless the breaker is visibly disconnected
and grounded.
After installation has been completed and prior to energizing the breaker, the following points of
inspection are recommended:
1. Ensure the breaker is properly leveled and securely anchored.
2. Make a final check of tightness of all hardware.
3. Check that the heaters work.
4. Verify that all barriers in high voltage compartment are in place (if removed during
inspection)
5. Securely tighten terminal and ground connections.
6. An A/C Hi-Pot test should be performed to verify the vacuum integrity. A successful
withstand indicates satisfactory vacuum integrity. Replace interrupters that fail to maintain
voltage across the open contacts. Please contact the factory for interrupter replacement.
Refer to section 9.2 High-Pot Test for procedure.
7. Make a continuity check, preferably one measuring contact resistance. Measure contact
resistance with suitable equipment rated not less than 100 A. The resistance value should
not exceed 150 micro ohms.
8. Check control cable entrance fittings for tightness.
9. Operate the breaker from the control box to verify normal operation.
10. Secure all doors and ensure proper gasketing for weather, if supplied.
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