Installation
3.0INSTALLATION
3.1Electrical preparations
Before beginning installation, the input source must be isolated and locked out to prevent connection during installation. The input circuit breaker on the rear of the UPS must be in the Off position.
! WARNING
Installation may be carried out only by qualified technicians and in conformity with the applicable safety standards.
! WARNING
Electric shock hazard: Even when the unit is disconnected from the utility, hazardous voltage may still be supplied by the battery. Both poles must be disconnected before any work is performed inside the UPS.
! WARNING
If the Maintenance Bypass Breaker is in the Bypass position, output power is available immediately upon application of AC input.
3.2Suggested Cable Sizes
Table 2 | Connection data * |
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Description | Units | Liebert® | ||
Connector size | AWG (mm2) | 6 | (10) | |
Max input current | Arms |
| 56* | |
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Input cable size (∅ and neutral) | AWG (mm2) | 6 | (10) | |
Max output current | Arms |
| 56* | |
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Output cable size (∅ and neutral) | AWG (mm2) | 6 | (10) | |
Ground (Earth) Cable Size | AWG (mm2) | 6 | (10) | |
Terminal Torque | 10 | (113) | ||
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*Cable must be 90°C copper wire
NOTE
To reduce electromagnetic interference:
•Enclose input and output cables to the UPS in separate metal conduits.
•Use shielded communication cables and route separately from power cables
3.3External Protection and Isolating Devices
An external 70A disconnect switch must be installed upstream of the UPS to protect power cabling and provide a means of isolating the UPS from utility.
! WARNING
The following label must be displayed on all switching devices installed in the same electrical system as the UPS, even when these are located at a distance from the area.
ENSURE THAT THE UNINTERRUPTIBLE POWER SYSTEM IS ISOLATED BEFORE WORKING ON THIS CIRCUIT
! CAUTION
A disconnect switch must be provided by others for AC output circuit. To reduce the risk of fire, connect only to a circuit provided with branch circuit overcurrent protection for 70A rating in accordance with the National Electric Code, ANSI/NFPA 70.
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