- general checks including assembly,tightness,external insulation, paint, corrosion protection, operating devices, earth connection and operations counter
- checks of electrical circuits including wiring, position indication, alarms, lockouts, heating and lighting
- checks of the insulation including filling pressure and quality
- site operations
- insulating and interrupting fluid alarm and lockout pressures on rising and falling pressures
- characteristic rising and falling operating pressures for hydraulic and pneumatic systems including lockout, low pressure alarm, safety valve
- power consumption during operations
- verification of the operating sequence
- closing and opening times of each pole including control and auxiliary contacts
- recharging time of the operating mechanism
- mechanical travel characteristics for circuit breaker
- opening,closing and auto reclosing at the minimal functional pressure for operation
- anti pumping operation checking
- the application of an opening command on both releases simultaneously
- protection against pole discrepancy
- dielectric tests on auxiliary circuits
- contact resistance test
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