Evolution Series E9000 User Manual
13
Exhaust Fan Installation for NEMA 1 Enclosure
Fan Assembly
Top Rear Cover Location
Figure 16A. Exhaust fan 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.
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 15A.
Note: For details on inlet filter maintenance, see Filter
Maintenance in Chapter 5.
Exhaust Fan Installation for UL Type 12 Enclosure
and Arc Resistant Vented Fan Shields
Filter Assembly
UL Type 12 Fan Assembly
Arc Resistant
VFD Fan Shield
Figure 16B. Exhaust fan for UL Type 12 enclosure
High heat loss 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 mounted on unit doors along
with filters. These fans and filters are factory installed.
Note: In addition to using Type 12 exhaust fans and
filters, Arc Resistant design will also have a vented fan
shield on the exterior of the door. For details on inlet
filter maintenance, see Filter Maintenance in Chapter 5.
Main Incoming Power Cables
Refer to the motor control center drawings provided by GE
for the location of the main disconnect or incoming line
terminals and the direction (top or bottom) of cable entry.
Cable-bending room provided within the vertical section
will meet or exceed National Electrical Code requirements.
Incoming line sections are provided with cable supports.
Incoming cables must be firmly secured to withstand
the significant forces that may be generated during a
short circuit .
Cables secured at each support, as illustrated in Figure
17 and Figure 18 (600A example), will adequately brace
cables for faults of 100K RMS symmetrical amperes,
