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Inspect busbar chamber, unit compartments and cable alleys. Remove tools, conductor strands and any other material lying loose.
Use vacuum cleaner to remove dust, small particles etc. Do not use air hoses which may contain oil, moisture.
Wipe the interior, particularly the insulation, using a clean cloth. Do not use cotton waste.
Check tightness of all electrical joints.
Plug all unused opening on outer surfaces.
Check alignment of operating handles for all switches and MCCBs.
While despatching the switchboard, SECONDARIES OF CURRENT TRANSFORMERS ARE SHORTED. Remove these shortings while connecting relays/meters.
Close all doors before energising the board. Do not operate any equipment with its compartment door open when the PCC is energised.
Ensure that settings on protective devices are set for proper overload and short circuit co-ordination.
Check operation of ACB and associated control circuit in accordance with the relevant scheme drawing.
Measure insulation resistance of the system for any short or ground connection, using a 500V DC meggar.
During the monsoon, the switchboard may show lower meggar values. If insulation level is lower than 1 Mohm, switch on the space heaters and check meggar value after some heating.
If meggar value is satisfactory, the HV test need not be carried out. (Repeated insulation properties. All individual components as well as switchboard assemblies undergo HV test in the Factory). However, if HV test is deemed necessary, it should be conducted as per relevant Indian Standard.
Ensure proper earthing connection.
Ensure that all other ACBs/switches are off before switching on the Incomer.
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