Space Requirements
Install MCCs in an area with a minimum of 3 ft. (0.9 m) of free space in front of front-of-board construction. An additional 3 ft. (0.9 m) is necessary in the rear of back-to-back construction. This free space provides adequate room to remove and install units. (More space may be required for some applications; refer to applicable local and national installation codes.) Provide at least 0.5 in. (13 mm) of space between the back of front-of-board MCCs and a wall. For damp locations, provide at least 6 in. (152 mm).
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Burn hazard from HOT GASES
Failure to follow these instructions will result in death or serious injury.
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Model 6 MCCs with the arc-rated option have pressure-relief roof flaps for top venting of arc fault gases. These MCCs require a minimum of 28.5 in. (724 mm) from the top plate of the MCC to the nearest obstruction (minimum ceiling height of 10 ft. (3 m) including base channel).
Aligning the MCC
A smooth, level surface must be provided for installation. An uneven foundation may cause misalignment of shipping blocks, units, and doors. The surface under an MCC must be of a non-combustible material, unless bottom plates are installed in each vertical section.