I N S TA L L AT I O N , O P ER AT I O N S A N D M A I N T EN A N C E M A N UA L
21
—
36
—
37
—
36
Installing wireway
transition channel
—
37
Installing floor plates
Channel barrier
mounting screw
1/4-28 x 3/8
thread rolling
Space
between
MCC
shipping
splits
Wire
channel
barrier
3 inch deep
floor plates
Exhaust fan installation for NEMA 1 enclosure
High heat loss main bus splice joints and/or
components, including certain solid state power
devices, may require removal of excess heat to the
MCC exterior environment. This is accomplished by
the utilization of exhaust fans.
For 3200A main bus, an elevated roof for ventilation
is required. This elevated roof is located on the rear
half of the top cover and is 5-inch tall as shown in
Figure 39.
—
38
—
39
—
38
Exhaust fan for
NEMA 1 enclosure
—
39
Elevated roof for
3200A main bus
—
40
Exhaust fan for UL
type 12 enclosure
NOTICE
Note:
For details on inlet filter maintenance, see
filter maintenance in Chapter 5.
Filter Assembly
UL Type 12 Fan Assembly
Arc-resistant VFD Fan Shield
Exhaust fan installation for UL type 12 enclosure
venten fan shields
—
40
Fan Assembly
Top Rear Cover Location
Exhaust fans, if required, are delivered to the
installation site as a separate shipping item. Fans
must be unpacked, checked for collateral damage,
and installed over the top rear conduit entry space
of the appropriate MCC section. Installation
involves connecting two mated control power
harness ends for each fan assembly. One harness is
located within the fan assembly. The corresponding
mated harness end is coiled and secured inside the
top rear of the section being ventilated.
If, upon delivery, it is found that standard rear top
section covers are in place on the section requiring
ventilation, the covers must be removed and
discarded. The exhaust fan assembly can then be
installed as shown in Figure 38.