for all unused openings in vertical bus barriers.
2.6.1.2
Motor Control Center Doors and Covers
Each unit compartment, including blank compartments for future use, shall
be provided with either a flange-formed or a rolled-edge door. Each door
shall be mounted on fully-concealed or continuous full-length piano-type
hinges and shall be provided with positive fasteners. Door sag shall be
prevented by proper alignment of hinges made of sufficiently strong
material. The door fastenings shall be so interlocked to prevent opening
when the equipment is energized. The external operating handle shall
clearly indicate whether the equipment is in an "ON", "OFF" or "TRIPPED"
position.
2.6.1.3
Horizontal Wireways
[Structure shall have a minimum 300 mm 12 inches high wireway at the top
and a 150 mm 6 inches minimum wireway at the bottom.] [Structure shall have
a minimum 150 mm 6 inches high wireway at the top and a 300 mm 12 inches
minimum wireway at the bottom.] Both horizontal wireways shall run the
length of the structure [A master terminal block compartment with full
length wireway space shall be provided at the [top] [bottom] [where
indicated] in all Type C assemblies.] Cover plates shall be provided on
the side of the assembly to permit extension of the horizontal bus and
wireway when vertical sections are added.
2.6.1.4
Vertical Wireways
Vertical wireways shall be provided in all vertical sections accepting
multiple plug-in components. Vertical wireways shall connect with
horizontal wireways at the top and bottom and be a minimum 100 mm 4 inches
wide. Barriers shall be provided in sections containing both ac and dc
vertical buses. Doors shall be provided on each vertical wireway. The
exposed surface of any door shall not deviate more than 1.5 mm 1/16 inch
from a true plane.
2.6.1.5
Sills
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NOTE: Structural sills are options provided by most
manufacturers and provide the structural stability
desired for equipment subject to the vibration of a
powerhouse. When equipment is to be mounted on
sills and on a maintenance pad, the 78" NFPA 70
requirement for height to operating handle may be
exceeded unless space for operator to stand on pad
is provided.
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Channel iron foundations, complete with bolts and drilled holes for
grouting and anchoring to the floor, shall be furnished for the complete
length (front and rear) of each motor control center assembly. The
channels shall be designed for flat mounting and maximum channel depth
shall be 38 mm 1-1/2 inches. Additional channel or substantial metal trim
shall be provided flush with the end panels to completely enclose the bases
across the ends of the equipment assemblies.
SECTION 16403A
Page 19
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