UT340, UT360, UT380, and UT3100
Planning and Installation Manual
10
201 Installing the Maintenance Bypass Cabinet (MBC) and UPS
IMPORTANT!
If you do not have a BEST maintenance bypass cabinet (MBC), you must provide
overcurrent protection and a UPS input AC disconnect means.
BEST strongly recommends that a means of bypassing the UPS from the critical load be
provided for maintenance.
Follow these guidelines when installing the MBC and UPS:
to find an appropriate location for the UPS. Install the
conduit connection kit per the instructions provided with the conduit connection kit.
Install the MBC within sight of the UPS. When installing the MBC, see Figure
and
any instructions provided with the MBC.
Install the AC input and UPS output in separate conduits. UPS output cabling shall be
installed in dedicated conduit systems and not shared with other electrical circuits.
Control wiring must be installed in separate conduit.
Good ground connections are necessary to reduce electrical noise and make the operation of
the UPS and the loads safe. Follow the grounding guidelines in the installation wiring
diagram. Refer to the National Electrical Code (NEC), appropriate IEEE documents, and all
applicable codes.
When installing the AC wiring, refer to Figure
and to any additional diagrams
provided with the UPS.
Figures
show typical installations. Your installation may differ.
• If you are installing the UPS with no maintenance bypass cabinet, see
• If you have a UT340 or UT360 with a BEST-supplied rotary switch MBC, see
• If you have a UT380 or UT3100 with a BEST-supplied three-breaker MBC, see
See
for a front view of the UPS with the covers removed. See
information on the external connection board. See
for information on the optional
communication interface board. See
for information on the optional relay board.
If you have any questions, contact BEST’s Technical Support Center for assistance (see