Hach sc200 - Figure 7: Required Obstruction-Free Area

80459-641-01E Model 6 Motor Control Centers
10/2012 Section 4—Installing the MCC
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19
ENGLISH
See figure 7 for the required area above the arc-rated MCC that must be
free from obstructions.
Aligning the MCC MCCs are assembled in the factory on a smooth, level surface to ensure proper
alignment of all sections. A similar smooth, level surface should 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.
DANGER
BURN HAZARD FROM HOT GASES
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• Keep the area directly above the equipment clear and unobstructed for
a distance of 28.5 in. (724 mm) from the roof.
Failure to follow this instruction will result in death or serious injury.
Figure 7: Required Obstruction-Free Area
Front
of MCC
Ceiling or other
obstruction
above MCC
Minimum
120 in.
(3048 mm)
28.5 in.
(724 mm)
14.24 in.
(362 mm)
Obstruction-free
area