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I N S TA L L AT I O N , O P E R AT I O N A N D M A I N T E N A N C E M A N U A L
8
The area outside the plenum exhaust vent needs to be kept clear of personnel and equipment due to the
potential for super-heated pressurized exhaust gasses being expelled in the area as a result of an arc fault in
the MCC. Specifically, a horizontal cylindrical volume, with an 96 inches diameter, centered on the plenum
exhaust vent and extending out 180 inches, needs to be clear at all times (see Fig. 4).
Diameter = 96in [2.44m]2. 3/8"-16 UNC X 1.0 in
Length = 180in [4.57m]
Fig. 4 Plenum exhaust area
Installation of bus bar connections between shipping splits
The factory assembles the main bus bar in each section. The splices at the shipping splits are unbolted for
shipment. Refer to the General Arrangement Drawings.
The contact surfaces of the bus at bolted joints are plated. Clean contact surfaces with a clean cloth and an
OSHA approved solvent.
CAUTION
Do not use alcohol or freon. Limit the use of solvents to removing grease and contamination from primary
conductors, insulation and unpainted metallic surfaces. Use an OSHA approved, non- flammable solvent with a
threshold limit of 300 PPM or higher in accordance with local regulations. Use solvents in well-ventilated areas.
Note: Take care not to remove or tarnish plating.
Remove barriers to access the main bus compartment. Bolt the main bus together using supplied hardware.
Conductivity of a bolted joint depends on the pressure or torque applied.
Note: All bolted joints must be torqued per ABB specifications – see Appendix B.
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