Wiring The Dc Power Source - Cisco Catalyst 2955 Hardware Installation Manual

Chapter 4 Installation in a Hazardous Environment

Wiring the DC Power Source

Warning
Warning
Warning
Warning
Caution
Caution
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Only trained and qualified personnel should be allowed to install or replace this
equipment. Statement 49
In switch installations in a hazardous location, the DC power source could be
located away from the vicinity of the switch. be sure that power is removed and
power cannot be accidentally be turned on or the area is nonhazardous before
proceeding. Statement 1059
When you disconnect the power and relay connector with power applied to the
switch, an electrical arc can occur. This could cause an explosion in hazardous
area installations. Be sure that power is removed from the switch and cannot
be accidentally be turned on, or verify that the area is nonhazardous before
proceeding.
Failure to securely tighten the power and relay connector captive screws can
result in an electrical arc if the connector is accidentally removed. Statement
1058
Connect the unit only to DC power source that complies with the safety
extra-low voltage (SELV) requirements in IEC 60950 based safety standards.
Statement 1033
The AC/DC power converter (PWR-2955-AC=) can only be used in a
nonhazardous location installation.
You must connect the Catalyst 2955 switch only to a DC-input power source that
has an input supply voltage from 18 to 32 VDC. If the supply voltage is not in this
range, the switch might not operate properly or might be damaged.
Verifying Switch Operation
Catalyst 2955 Hardware Installation Guide
4-21