GE Evolution E9000 Series Installation, Operation And Maintenance Manual page 16

E VO L U T I O N S E R I E S E 9 0 0 0 M OTO R C O N T R O L C E N T E R
16
—
Positioning and joining sections
10A
If groups of sections are to be joined together in a
Side view of a 20-inch-
deep section showing
final lineup, remove the end cover plates and the
the cover plates,
plug buttons, from the sides of the sections to be
plug bottoms and
joining points
joined. Figure 10A shows the side views, with the
— end cover plates removed, for 20-inch-deep
10B
sections with 2-inch (50.8 mm) and 4-inch
Type 12 and arc-resistant
gasket material between (101.6 mm) bus bars.
section splits
Carefully check and remove dirt, dust or bits of
packing material from the interior of all sections.
Use a brush, soft cloth or vacuum cleaner.
Do not use compressed air to clean the equipment
if it contains moisture. Remove all hardware
packages, drawings and other items shipped with
the equipment. Check all nuts, bolts, and electrical
joints for tightness.
All cables entering the bottoms of sections should
be pulled through conduits to a point where they
will be accessible after the equipment is in place.
Sections can be moved to their final position and
properly leveled.
For arc-resistant plenum-less design, the cables
should enter through the front aluminum flap on
top of the section.
Wire way
End cover plate
Three-phase bus
Plug buttons
Neutral or ground bus
(when specified)
—
10A
A
A
B
B
C
C
For Type 12 and arc-resistant enclosure, see Figure
10B for proper gasket in between the section splits.
For additional gasket material order part number
245A1888P5.
Gaskets
—
10B
NEC work space
NEC Work Space is defined in Table 110.26(a)
Working Spaces. Included in these clearance
requirements is the step-back distance from the
face of the equipment. Table 110.26(a) provides
requirements for clearances away from the
equipment, based on the circuit voltage to ground,
and whether there are grounded or ungrounded
objects in the step-back space, or if there are
exposed live parts across from each other. The
voltages to ground consist of two groups: 0 to 150
and 151 to 600, inclusive. Remember, where an
ungrounded system is utilized, the voltage to
ground will be the greatest voltage between the
given conductor and any other conductor of the
circuit. For example, the voltage to ground for a
480-volt ungrounded delta system is 480 volts.
See Figure 11 for general working clearance
requirements. Distances are measured from the
live parts if the live parts are exposed, or from the
enclosure front if live parts are enclosed. If any
assemblies, such as switchboards or motor control
centers, are accessible from the back and expose
live parts, the working clearance dimensions would
be required at the rear of the equipment, as
illustrated. Note that for Condition 3, where there is
an enclosure on opposite sides of the working
space, the clearance for only one working space is
required.