Cisco Catalyst 2955 Series, Hardware Installation Manual, Page: 137 / 298

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Catalyst 2955 Hardware Installation Guide
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Chapter 4 Installation in a Hazardous Environment
Preparing for Installation
Warning Do not disconnect connections to this equipment unless power has been
removed or you have verified that the area is nonhazardous. Secure any
external connections that mate to this equipment by using screws, sliding
latches, threaded connectors, or other means provided with this product.
Substitution of components may impair suitability for Class I, Division 2.
Statement 1062
Warning
When you connect or disconnect the power and relay connector with power
applied, an electrical arc can occur. This could cause an explosion in
hazardous area installations. Be sure that power is removed from the switch
and alarm circuit. Be sure that power cannot be accidentally 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
Warning
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
Warning
The nominal voltage for this product is 24 V. When the switch is installed in
hazardous locations, the safe operating range of 18 to 30 VDC must be
maintained.
Statement 1060