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This dedicated space is described as starting at the floor and extending to the ceiling or 6 feet above the equipment, whichever comes first.If the ceiling is much higher than that, the required space stops at 6 feet above the equipment.
Any type of foreign equipment that is not part of the electrical installation, such as piping or mechanical duct work, is prohibited from the dedicated space.
Such foreign equipment is permitted above the dedicated space if it is more than 6 feet above the top of the equipment.
If the equipment that runs above the dedicated space represents some type of threat, such as plumbing that might leak on the equipment, then the foreign equipment must be protected, perhaps by a drain pan. Neither the drain pan nor the piping are permitted to be in the dedicated space. This does not preclude sprinkler protection for the dedicated space, but it does exclude the main sprinkler piping from being in that space.
© Hughes Associates,Inc. 2012