18 Researching the requirements

AC-powered SL-1 systems-

Power converters in SL-1 systems, which use alternating current, operate at
a nominal 208/240 V ac. A typical system operating from 208 V using four
UEMs
will draw 15-25 Amps depending on the configuration. These are
fed from a central point in the pedestal; access to these connections is
provided and should be used to confirm that the
Ihe
voltage is within the
required range.
Reserve power-AC-powered systems with reserve power use an
Uninterruptable Power Supply (UPS). The UPS must be installed according
to the vendor’s specifications. The UPS installation should be inspected
and signed off prior to starting the SL-1 system installation.
Commercial AC power source
Although some smaller DC systems may use rectifiers that can be
configured for 120 volts, Northern Telecom recommends that all systems
use single-phase 240 volt or 208 volt single phase which is
208Y
derived:
Installation planning 553-3001-120
.4
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