I N S TA L L AT I O N , O P ER AT I O N A N D M A I N T EN A N C E M A N UA L
20
Semi annual inspection
Perform a thorough inspection of the MCC at least semiannually. Emphasize the following points:
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Perform an overall visual inspection.
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Check all indicators, meters and instruments for proper operation.
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Make sure all bolted connections are secure.
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Verify operation of heaters and thermostats, if used.
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Check for undue noise and or vibration that might c bee loosen bolted connections.
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Look for evidence of moisture in the MCC.
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Note any unusual amount of ozone odor (distinctively pungent smell).
Annual inspection
In addition to the semi-annual inspection, perform the following recommended inspection and maintenance once a
year, or sooner.
If required by local conditions or regulations.
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Bolted connections should be properly tight. Discoloration, excessive corrosion and discolored insulation may
indicate an overheated connection. If found, follow the procedure described under section “suspect joint
maintenance”. Verify the existence of safety connections and spacing adapted in the wiring.
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Check the control wiring for signals of damage or wear. Change the wires that present doubtful conditions.
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Check the resistors and other devices prone to over-heating.
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Open all hinged doors and remove bolted panels.
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Clean insulation thoroughly.
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Withdraw and clean all removable components.
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Clean the stationary portion of the MCC by wiping with a clean cloth. Use dry, compressed air for inaccessible
areas.
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Remove the covers of all panel devices where possible. Check wiring for secure connections. Clean contacts on
relays and switches wherever necessary. Replace covers.
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Remove air filters when used. Flush with clean water if necessary.
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Follow the recommendations of any individual device instructions furnished for maintenance of the device.
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Perform maintenance of contactors as recommended in contactor instruction manual, furnished with the MCC.
24 months inspection
In addition to the annual inspection, perform the following recommended inspection and maintenance at 24
month intervals, or sooner, if required by local conditions or regulations.
•
Perform maintenance of contactors as recommended in instructions furnished with the MCC
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Check wiring for signs of discoloration of the secondary disconnect the plug due to heating or wear. Check if the
insulation is cracked or fissured. Replace the wire with doubtful condition
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Inspect the insulation system for the accumulation of contaminants. Wipe with a dry cloth or blow with compressed
air and if necessary, wipe with a solvent approved by OSHA.
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Check calibration of protective relays every two years.
10 years maximum inspection
In addition to the annual inspections and maintenance, perform the following recommended inspections and
maintenance every ten years, or sooner, if required by local conditions or regulations.
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Disassemble, inspect, clean, lubricate, adjust and calibrate contactor mechanisms.
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Torque all primary conductor connection bolts to recommended values. See table Torque values.
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Tighten all secondary control wire connections. Check for loose lug crimps and broken wire strands.
