UFC 3 -520-01
June 10, 2002
14-1.2.3.3 Sealed battery cubicle inside a UPS with insulated terminal covers in which
the battery requires disconnection to gain access. This is another maintenance-proof
design; periodic voltage measurements are not even possible. Some UPS enclosures
require partial or sometimes almost complete disassembly just to reach the batteries,
and thus cannot be inspected while in service.
14-1.2.3.4 VRLA installations that are so tall that a ladder is needed to reach the upper
rows.
14-1.2.3.5 Battery installations hidden behind other equipment, which is also a violation
of local building codes.
14-1.2.4. Figures 14-2 and 14-3 show typical battery rack configurations for vented
cells. Regardless of the design, personnel should think through how they will have
ready access to each cell. Larger VRLA cells are often mounted horizontally in a
vertical configuration and have plastic safety covers over the terminals.
Figure 14-2. Two-Step Battery Rack Configurations (End V iew)
Cell
Cell
Cell
Must Be Open in
Front of Rack to
Provide Access
Cell
a. Two-tier battery
b. Two-step battery
14-4
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