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22 | 2.0 installation
2.5.2 AC Input/Output Hardwire Installation
CAUTION
!
This installation must be performed by competent electrical personnel and wired in accordance with local and
national electrical codes.
When installed in the US, Model S4K2U3000C-5C must be installed in accordance with the National Electrical Code,
ANSI/NFPA 70. In order to reduce the risk of fire, connect only to a circuit provided with 20 A maximum branch over-
current protection.
Installation Considerations:
On start-up, the UPS will take a half cycle inrush current of up to 3 times the rated current. This must be taken into
account when selecting the overload protection device at the input mains supply distribution point. To avoid random
tripping on startup, we recommend that the input mains supply be protected with a mCB (mechanical Circuit Breaker)
capable of withstanding this initial inrush.
The mains input supply cable must be connected to the UPS via a wall mounted double pole circuit breaker. The UPS
output port must also be protected with a double pole circuit breaker connected to the load, rated to carry the input
current, and be capable of breaking the maximum prospective short circuit current of this branch circuit. The breakers
are to be mounted within six feet of the UPS and be readily accessible to the operator. Please refer to Table 3 for breaker
specifications.
High quality ground (earth) connections are required for the equipment ground conductors (protective earth) and
grounding electrode conductor (power system earth connection) to reduce electrical noise and provide for safe operation
of the UPS and connected loads. Conduit used alone without a grounding conductor wire is not an acceptable connec-
tion. Size ground (protective earth) conductors equal to circuit conductors. For wiring information, please refer to Table 3.
Table 3: Overcurrent Protection & Wiring Specifications
Input Current
Model VA
Rating
1000 VA
4.2 A
2000 VA
8.7 A
3000 VA
13.0 A
NOTES:
make sure the UPS is turned off and unplugged before removing the original cord/receptacle board. To install the
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cable box, the original cord/receptacle board must be removed and disconnected from the terminal block.
The cable sizes and distribution methods used during installation are subject to local/national electrical codes of
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practice, and therefore are not detailed here. Table 3 details the standard current ratings. The UPS rating plate gives
details of the current ratings for alternative output voltages.
When choosing the input and output cables, users should strictly adhere to Table 3 for cable dimensions. Failure to
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observe Table 3 could result in personnel injury or damage to the UPS.
When installing the cable box, make sure that the input and output cables do not interfere with the position the
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UPS or external battery connectors.
User needs to supply hardware for securing input and output cables.
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Section 2.5.3 describes the connection of optional external batteries. DC battery connections may not be hard-
•
wired. Safety/EmC certification requires that the supplied battery cable be used.
Recommended External
Overcurrent Protection
10 A
16 A
16 A
For nEC/CEC Applications: 20 A
Maximum Wire
Recommended Wire
Accepted by
(105°C Copper Wire)
Terminal Block
16 AWG/1.31 mm
8 AWG/8.36 mm
2
14 AWG/2.08 mm
8 AWG/8.36 mm
2
14 AWG/2.08 mm
8 AWG/8.36 mm
2
Terminal Tightening
Torque
20 in.-lb./2.25 n-m
2
20 in.-lb./2.25 n-m
2
20 in.-lb./2.25 n-m
2
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