PROPERTY OF SOLIDSTATE CONTROLS, INC. 7/98
The site selected for the UPS should be chosen with care since the type and amount of site
preparation required will vary according to the specific location and its relative location to the load.
The relative location of the UPS to the load is important for several reasons. First, the greater the
distance between the UPS and the load, the longer will be the interconnection cables; the longer
the cables, the larger the wire will need to be in order to minimize the voltage drop in the wires.
This means greater expense. For example, a 20 kVA UPS with 120 VAC single phase output of
167 amps, if used with 2/0 gauge wire, ahs a voltage drop of 2.7 volts in 200 feet. The a 500MCM
cable, the voltage drop is only 0.7 volts. However, 500MCM wire is almost four times the size of the
2/0 gauge and proportionally more expensive. Second, and most important, is the fact that these
longer cables are more likely to pick up electrical noise from outside sources than are shorter
cables, simply because they are more likely to pass near noise generating equipment or other
noise carrying conductors. The elimination of electrical noise is one benefit of the UPS. It is
important to keep these cable lengths as short as possible and removed from the proximity of other
cables or noise generating equipment such as motors, switches, etc. If long cable runs are
unavoidable, greater care should be exercised in cable routing and sizing.
The Inverter and Rectifier/Charger
It is important that adequate floor space be provided for the UPS electrical equipment. Check the
dimensional information on the appropriate data sheets for the floor space requirements. The UPS
equipment can be mounted with the back against a wall. Side access is not specifically required;
however, if side and rear access can be maintained, it may be helpful should service become
necessary. A clear area in front of the unit of at least five (5) feet should be maintained for service
personnel.
In order to provide for adequate ventilation, the UPS should be installed in a room which has a
least 12 inches of clearance over the unit. The area above the UPS should be clear of any
obstruction which would impede air flow. Since cooling air enters through a grill at the bottom front
of the equipment, this area must also be kept clear of any obstructions.
The Inverter and Rectifier/Charger
Some of the larger UPS systems are relatively heavy. Care should be taken to assure that the floor
loading requirements are not exceeded. Reference can be made to the appropriate literature for
dimensions and weights. Floor loading can be expected to vary from 90 lbs. Per square foot on
smaller units to over 300 lbs. per square foot for our very large units. One should plan accordingly.
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