9
9
Figure 7A: 60 Hz 6 and 10 kVA Installation Wiring Diagram, L1 - L2 Installation
without Optional Bypass Switch
!
BUILDING GROUNDING
ELECTRODE OR
PROTECTIVE EARTH
SYSTEM
N
L2
L1
Note 2
Note 1
Note 6
TO
LOADS
Note 4
Note 3 Note 9
L1 L2
X1 X2 X3 X4
Note 8
Note 9
Note 10
N
L2 L1
Note 7
Note 5
IG
Note 3
Note 1
NOTE 1: The UPS includes an input circuit breaker. See Section
304, no. 4 to size the AC input service panel service breaker.
The customer must provide overcurrent protection at the input
service panel per National Electrical Code (NEC) Article 240 or
local code requirements.
NOTE 2:The customer must provide and install this ground
(earth) connection per NEC Sections 250-20, 250-30, 250-62 and
250-64 or local code requirements. This grounding electrode
conductor must be at least #8 AWG (8.36 mm
2
) per NEC table
250-66. If the UPS input circuit conductors are larger than #8
AWG (8.36 mm
2
), 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 code
requirements.
NOTE 3: 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 be sized according
to the input protection device. The UPS input and UPS output
conductors must be run through separate conduits.
NOTE 4: The UPS includes an output circuit breaker. See NEC
Section 240-21 or local requirements for output overcurrent
protection requirements.
NOTE 5: See Figure 8 for proper output wiring termination and
neutral-to-ground (neutral-to-earth) connection.
NOTE 6: For maximum protection against electrical noise, use
isolated ground receptacles. See NEC Section 250-146(d), or
local code requirements.
NOTE 7: See Section 901for installation dimensions and Section
302 for service 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. See Section 305
for installation procedures.
NOTE 9: UPS output circuits shall be installed in dedicated
conduit systems and not shared with other electrical circuits.
NOTE 10: The output load current must be balanced. See the
notes to Figure 8.
CAUTION
The output circuit is considered a separately derived power source. To ground this circuit, the installing electrician must connect a
neutral-to-ground wire 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 8.
