2-16
Issue 9 October 1998
363-206-204
Equipment and Rear Access Cable Installation
NOTE
:
Four cables are spliced to each power cable: BAT A, BAT A RTN, BAT B,
and BAT B RTN.
NOTE
:
The cables must be a minimum of 10 gauge for bay arrangements, or 12
gauge for a single shelf.
8. Label the feeders at the BDFB BAT A, BAT A RTN, BAT B, and BAT B RTN.
NOTE
:
Each feeder at the BDFB should be fused for 25 amperes for bay arrange-
ments and 10 amperes for a single shelf.
9. Leave the BDFB fuses out or breakers off until you are ready to do the
"Powering, Verification, and Circuit Pack Installation" section of this manual.
Office Alarm Cable Installation - Rear
Access
Description
Office alarms are the common method used in a central office for maintenance
personnel to quickly isolate a failure. Perform this procedure if connection to the
office alarm system is required.
NOTE
:
The office alarm relay contacts are rated at 50 VA which means that they
are capable of switching 1 amp at 50 volts, or 2 amps at 25 volts. Their abil-
ity to switch large transient currents means that they can, if necessary,
switch up to ten 5-watt aisle pilot lamps.
NOTE
:
If transient voltages or currents are above these limits, transient noise-sup-
pressing devices such as diodes or contact protection networks must be
used to keep within the voltage and current limits. If these protection
devices are not sufficient, an external buffer relay MUST be provided.
NOTE
:
In all cases, and as a matter of good practice, suppression devices such as
diodes or contact protection networks must be provided across any exter-
nal relay coil being driven by the DDM-2000 OC-3 to limit transient voltages
and currents.
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