Inspecting the Enclosure
Perform inspection, cleaning, and any required repair activities as part of the initial maintenance of the MCC and at periodic inspection and maintenance intervals.
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Inspect the interior and exterior of the MCC for moisture, oil, or other foreign material. Eliminate all foreign material and clean the MCC.
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Clean the interior and exterior of the MCC with a vacuum cleaner. (Do not use compressed air; it will redistribute contaminants to other surfaces.) Check the enclosure for damage that might reduce electrical clearances.
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Examine the finish of the enclosure. Touch up the paint if necessary. Replace any badly corroded or damaged enclosure parts.
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Check the MCC interior carefully for moisture, condensation build-up, or signs of previous wetness. Moisture can compromise electrical insulation systems and cause rapid oxidation of current-carrying parts. Inspect all conduit entrances and cracks between the enclosure panels for dripping leaks. Condensation in conduits can be a source of moisture and must not be allowed to drip onto live parts or insulating material. Take the necessary steps to eliminate moisture and seal off leaks.