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10
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The highest altitude that the UPS will operate normally under full load is 1500 meters / 4500
feet. The load capacity should be reduced when the UPS is installed in locations where the
altitude is higher than 1500 meters, according to the following table:
(Load coefficient equals max load in high altitude place divided by nominal power of the UPS)
Altitude
(m / ft)
1500
4500
2000
6000
2500
7500
3000
9000
3500
10500
4000
12000
4500
13500
5000
15000
Load
Coefficient
100%
95%
90%
85%
80%
75%
70%
65%
3.5 External Protective Devices
For safety reasons, it is necessary to install external circuit breaker/s at the AC input supply and
the battery. This chapter provides guidelines for the equipment to be installed by qualified
installers with knowledge of local wiring practices.
◆
External Battery
The UPS and its associated batteries are protected against over-current conditions
via a DC compatible thermo-magnetic circuit-breaker (or a set of fuses) located
close to the batteries.
◆
UPS Output
Any external distribution panel used for load distribution should be fitted with protective
devices to avoid the risk of overload.
◆
Over-Current
A protection device/s should be installed at the distribution panel of the incoming main supply.
It should identify the power cable current capacity as well as the overload capacity of the system.
3.6 Power Supply Cabling
◆
The cabling should comply with the voltage and current ratings provided in this section.
Please follow local wiring codes and practices and take into consideration environmental
conditions.
WARNING!
As a preliminary precaution, be aware of the location and operation of
the external isolators which are connected to the UPS input / bypass
supply at the main distribution panel. Check if these supplies are
electrically isolated. Post necessary warning signs to prevent any
hazardous operational conditions.