UFC 3 -520-01
June 10, 2002
13-4.5.7 The battery charger might require current limiting characteristics when
emergency power, such as an engine generator, provides power to the UPS.
Otherwise, the combined load, consisting of the UPS loads and the battery recharge
current, could require a larger engine generator design. By limiting the maximum
current, a smaller engine generator can be used.
13-4.5.8 Unattended locations might require remote monitoring capability so that other
attended locations can respond promptly to UPS failure alarms.
13-4.6
Site Survey for an Installation .
13-4.6.1. Perform a site survey as part of a UPS design and installation. The purpose
of this survey is to ensure that building environmental and equipment location
constraints are understood before equipment is procured.
13-4.6.2 Record the required facility information. Table 13-2 lists typical information to
be obtained.
Table 13-2. Building and Room Characteristics Data List
General Building
General Room
Characteristics
Characteristics
Location
Location
Building designation
Room designation
Obstructions--location and
Structural--floor and ceiling load
dimensions
requirements and constraints
Equipment heat dissipation
Environmental-- temperature and
humidity
Access
Wall material
Security
Ceiling material
Dimensions-- height, width, and length
Comments
Obstructions--location and
dimensions
13-4.6.3 Determine the existing electrical system capability, including transformer and
generator ratings. This information is required to ensure the UPS can be adequately
powered by the existing system.
13-5
AUTOMATIC TRANSFER EQUIPMENT.
13-5.1
Introduction.
13-5.1.1 An automatic transfer switch (ATS) is used to transfer powe r from one source
to another. An ATS often includes controls that detect a power failure and triggers other
13-12
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