MBM INSTALLATION PLAN AND UNPACKING
Eaton 9395 Maintenance Bypass Module Installation and Operation Manual
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164201719 Rev 3
www.eaton.com/powerquality
3-5
3.2.2
MBM Power Wiring Preparation
Read and understand the following notes while planning and performing the
installation:
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Refer to national and local electrical codes for acceptable external wiring practices.
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For external wiring, use 90
°
C copper wire. If wire is run in an ambient temperature
greater than 30
°
C, higher temperature wire and/or larger size wire may be
necessary. Wire sizes are based on using the specified breakers.
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Wire ampacities are chosen from Table 310-16 of the NEC. Wire is 90
°
C
specification.
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Per NEC article 300,3(B)(1), all three‐phase conductors must be run in the same
conduit. Neutral and ground must be run in the same conduit as the phase
conductors. Size conduit to accommodate one neutral conductor the same size as
the phase conductor and one ground conductor sized in accordance with NEC
Table 250.122.
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Material and labor for external wiring requirements are to be provided by
designated personnel.
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Refer to the applicable Eaton 9395 UPS Installation and Operation manual listed in
paragraph 1.7 on page 1-4 for UPS cabinet wiring requirements, and conduit and
terminal locations.
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When installing an MBM, a minimum of two separate feeds with upstream feeder
breakers, or a single feed with two upstream feeder breakers, must be provided:
one for the UPS and one for the maintenance bypass input. DO NOT use a single
feed or a single feeder breaker to supply both the UPS and the maintenance
bypass. If a bypass input breaker (BIB) is installed in the MBM and a single-feed
UPS is being installed, a single feed to the maintenance bypass is acceptable for
supplying both the UPS and the bypass. If a rectifier input breaker (RIB) and a
bypass input breaker (BIB) are installed in the MBM, a single feed to the
maintenance bypass is acceptable for supplying both the UPS and the maintenance
bypass.
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The bypass feed into this equipment uses three or four wires.
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If the load requires a neutral, a bypass source neutral must be provided.
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The MBM cabinet is shipped with a debris shield covering the ventilation grill on
top of the unit. Do not remove the debris shield until installation is complete.
However, remove the shield before operating the MBM. Once the debris shield is
removed, do not place objects on the ventilation grill.
