Installation manual

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:

Use the information in Section 106 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 4 or 5 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 3, 4, or 5 and to any additional diagrams
provided with the UPS.

Figures 3, 4, and 5 show
typical installations
. Your installation may differ.
•If you are installing the UPS with
no maintenance bypass cabinet
, see Figure 3.
•If you have a UT340 or UT360 with a BEST-supplied rotary switch MBC, see Figure 4.
•If you have a UT380 or UT3100 with a BEST-supplied three-breaker MBC, see Figure 5.

See Figure 2 for a front view of the UPS with the covers removed. See Figure 6 for
information on the external connection board. See Figure 7 for information on the optional
communication interface board. See Figure 8 for information on the optional relay board.

If you have any questions, contact BEST’s Technical Support Center for assistance (see
Section 107).