Installation manual
21
Notes for Figure 8:
Table 10: Recommended Input Fuse for Models with Optional 380/400/415 VACInput
CAUTION!
The AC output circuit is considered as a separately-derived source. To ground this circuit, the installing electrician MUST connect the
neutral-to-ground (neutral-to-earth) wire (the green and yellow wire labeled WIA-0424) to the proper output terminal before making any
other connections to the UPS; for the proper output terminal connection, find your output configuration in Figure 9 on pages 22 - 24.
NOTE 1:Provide input protection per local code requirements. See Table
10 below for input current ratings.
NOTE 2:The UPS bypass switch/AC disconnect must be installed within
sight of the UPS. To properly install, see Section 300 of this manual.
NOTE 3:The customer must provide and install the power system earth
connection per local code requirements. The power system earth conduc-
tor must be at least #8 AWG (8.36 mm
2
). If the UPS input circuit conduc-
tors are larger than #8 AWG (8.36 mm
2
), Best Power requires the power
system earth conductors to be the same size (ampacity) as the largest
UPS input circuit conductor. Conduit is not considered an acceptable
power system earth conductor. Best Power recommends that you do not
route the power system earth conductor through metallic conduit. The
power system earth conductor may require protection from physical dam-
age per local code requirements.
NOTE 4:All AC circuit conductors, including the neutral and equipment
grounding conductors, must be the same size (ampacity) and have the
same rating (75° C copper wire) and be sized according to the input pro-
tection device. AC-to-UPS input and AC-from-UPS output conductors must
be run through separate conduits.
NOTE 5:The UPS requires 102 mm (4 inches) clearance at the top and
rear. A service clearance of 910 mm (36 inches) is required at the front of
the UPS and is recommended at the sides. Use flexible metal conduit on
the UPS or external battery cabinet if either must be moved to obtain
required service clearance.
NOTE 6:External UPS batteries are optional. See the information that
came with your battery pack(s) for installation procedures.
Fuse
25 A
32 A
25 A
25 A
25 A
25 A
UT8K
Input Amps
24
26
23
25
22
24
Fuse
16 A
20 A
16 A
16 A
16 A
16 A
UT5K
Input Amps
15
17
14
16
13
15
Fuse
16 A
16 A
16 A
16 A
16 A
16 A
UT4K
Input Amps
12
14
11
13
11
13
Fuse
10 A
16 A
10 A
16 A
10 A
10 A
UT3K
Input Amps
9.1
11
8.6
11
8.3
10
Battery
Charger
Standard
15 Amp
Standard
15 Amp
Standard
15 Amp
UPS Input
VAC
380
400
415