UT340, UT360, UT380, and UT3100
Planning and Installation Manual
13
Figure 4: UT340 and UT360 Installation Wiring Diagram, Typical Installation
NOTE 1: Size the mains input overcurrent protection
device per applicable codes. See the table below for
mains input voltage and current ratings.
Mains Input
UPS Model
VAC
Maximum Amps
UT340
208
200
UT340
480
86
UT360
208
301
UT360
480
130
NOTE 2: (a) Refer to any instructions provided with the
DC disconnect (DCD) and pre-charge/discharge box.
(b) The pre-charge/discharge box must be located less
than 10 feet (3 meters) from the DC disconnect.
ADDITIONAL NOTES:
A qualified electrician must install the UPS according
to all applicable codes.
All power and control wires must be in separate
conduits.
The grounding electrode conductor (protective
earth—PE) must be the same size (ampacity) as the
UPS input circuit conductors. Conduit is not an
acceptable grounding electrode conductor—see
National Electrical Code Section 250-91(a).
A UT340 or UT360 unit is wired from the factory as a
separately derived system. Output neutral is bonded to
equipment ground through main bonding jumper inside
the UPS. See National Electrical Code Article 250-5(d)
and 250-26 for proper installation grounding.
If you do not have a BEST-supplied maintenance
bypass cabinet (MBC), you must provide overcurrent
protection and UPS input AC disconnect means.
The maintenance bypass switch must be a 4-pole
device which switches all three phases and neutral. If
you are using a 3-pole device, contact BEST’s
Technical Support Center for instructions to convert the
unit to a not-separately derived system.
