13
13
Figure 7E: Installation Wiring Diagram for B610 6 & 10 kVA Models
with External BBM Bypass Switch and External Isolation Transformer
NOTE 1: The customer must provide input overcurrent protection
as stated in NEC Section 240-21. Size the protection device
according to local code requirements.
NOTE 2: The UPS bypass switch/AC disconnect must be
installed within sight of the UPS. To properly install, complete the
Phase Check on pages 14 and 15.
NOTE 3: The customer must provide and install this ground
connection according to NEC Sections 250-20, 250-30, 250-62
and 250-64 or local requirements. This grounding electrode
conductor must be at least #8 AWG (8.36 mm²), per NEC table
250-66. If the UPS input circuit conductors are larger than #8
AWG (8.36 mm²), Best Power requires the grounding electrode
conductor to be the same size (ampacity) as the largest UPS
input circuit conductor. See NEC Section 110-3(b). Conduit is not
considered an acceptable grounding electrode conductor. Best
Power recommends that you do not route the grounding electrode
conductor through metallic conduit. This conductor may require
protection from physical damage according to local requirements.
NOTE 4: All 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 must be sized
according to the input circuit breaker.
NOTE 5: The customer must provide output overcurrent protection
as stated in NEC Section 240-21. Size the protection device
according to local code requirements.
NOTE 6: For maximum protection against electrical noise, use
isolated ground receptacles. See NEC Section 250-146(d).
NOTE 7: See Section 901 for dimensions and Section 302 for
clearances before installing the UPS. Use flexible metal conduit
on the UPS or the external battery cabinet if either must be
moved.
NOTE 8: External UPS batteries are optional for some models
and standard for others. The battery cables are connected to the
DC terminals on the DIN RAIL in the UPS. See Section 305 for
external battery installation.
NOTE 9: For 208 VAC, use a Step-Up transformer. For 480 VAC,
use a Step-Down transformer. Use an isolation transformer with
a 120/240 grounded center-tapped neutral output. Do not use a
buck/boost transformer.
NOTE 10: UPS output circuits shall be installed in dedicated conduit
systems and not shared with other electrical circuits.
NOTE 11: The load fuse or circuit breaker should be sized to
match the load current requirements.
NOTE 12: See Figure 8 on for proper output wiring termination
and neutral-to-ground (neutral-to-earth) connection.
BUILDING GROUNDING
ELECTRODE OR
PROTECTIVE EARTH
SYSTEM
AC LINE INPUT
AC TO
UPS INPUT
AC FROM
UPS OUTPUT
AC TO LOADS
Note 2
Note 11
Note 10
Note 6
Note 9
Note 10
Note 10
Note 5
Note 8
Note 3
Note 7
TO
LOADS
Note 4
Note 4
Note 4
Note 4
N
N
L1
L1
L2
L2
Note 1
9 10 11 11 12 12
15 14 13
5 6 7 8
1 2 3 4
N
N
N
L1
L1
L1
L1
L2
L2
L2
L2
!
L1 L2
X1 X2 X3 X4
Note 12
