Cisco 8500 - Connect AC Power to the Chassis

In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This label is
a relatively safe indication of polarity, but you must verify the polarity by measuring the voltage between
the DC cable leads. When measuring, ensure that the positive lead and the negative lead always match
the "+" and "-" labels on the DC-input power supply terminal block, respectively.
• DC power cables use the M-CRPS connector at the power supply end.
• The circuit must be protected by a dedicated two-pole DC-rated circuit breaker.
The circuit breaker is considered to be the disconnect device and must be easily accessible. For DC-input
power supply units with multiple inputs, each DC input must be protected by a dedicated DC-rated circuit
breaker or a fuse.
The circuit breaker or fuse should be sized according to the power supply input rating and local or national
code requirements.
• If the DC inputs are powered from separate sources, the cables must be wired straight across to their
respective sources and terminals.
Crossed cables in a setup where the DC source has floating outputs means that no damage will occur,
but the LEDs will not light up, and the module will not operate.
Crossed cables in a setup with a positive ground or a negative ground power system constitute a severe
safety hazard that includes causing electric shock and generating excessive EMI and RFI.
In the illustration, the red and black cables do not interconnect. The two black
cables are connected to the same negative output of the DC source; the two red
cables are connected to the same positive output of the DC source.
Note
Connect AC Power to the Chassis
Statement 1017—Restricted Area
This unit is intended for installation in restricted access areas. Only skilled, instructed, or qualified personnel
can access a restricted access area.
Warning
Statement 1005—Circuit Breaker
This product relies on the building’s installation for short-circuit (overcurrent) protection. To reduce risk of
electric shock or fire, ensure that the protective device is rated not greater than:
AC: 20A, DC: 40A
Warning
Hardware Installation Guide for Cisco 8500 Switches
44
Powering on the Switch
Connect AC Power to the Chassis