Cisco Cisco Content Delivery Engine 220 Installation Guide
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Cisco Content Delivery Engine 465 Hardware Installation Guide
Chapter 2 Preparing to Install the CDE465
Safety Guidelines
applies. The suitability of this product for other product categories and environments (medical,
industrial, telecommunications, residential, alarm systems, test equipment, and so on), other than an ITE
application, may require further evaluation.
industrial, telecommunications, residential, alarm systems, test equipment, and so on), other than an ITE
application, may require further evaluation.
Caution
Although CDEs accept both AC and DC power modules, the system does not allow mixing of AC and
DC power modules in one system.
DC power modules in one system.
If AC Power Supplies Are Installed
Source AC power disconnect: The AC power cord is considered the source disconnect for the CDE465
and must be readily accessible when installed. If the individual CDE465 power cords are not readily
accessible for disconnection, you must install an AC power disconnect for the entire rack unit. This main
disconnect must be readily accessible, and it must be labeled as controlling power to the entire rack, not
just to the CDE465.
and must be readily accessible when installed. If the individual CDE465 power cords are not readily
accessible for disconnection, you must install an AC power disconnect for the entire rack unit. This main
disconnect must be readily accessible, and it must be labeled as controlling power to the entire rack, not
just to the CDE465.
Grounding the rack installation— If the CDE465 power cord is plugged into an AC outlet that is part of
the rack, you must provide proper grounding for the rack itself. When the CDE465 power cord is plugged
into a wall AC outlet, the safety ground conductor in the power cord provides proper grounding only for
the CDE465. Take precaution when the CDE465 power cord is plugged into an AC outlet that is part of
the rack. You must make sure that proper grounding on the rack power outlet is provided or provide
proper grounding for the rack itself.
the rack, you must provide proper grounding for the rack itself. When the CDE465 power cord is plugged
into a wall AC outlet, the safety ground conductor in the power cord provides proper grounding only for
the CDE465. Take precaution when the CDE465 power cord is plugged into an AC outlet that is part of
the rack. You must make sure that proper grounding on the rack power outlet is provided or provide
proper grounding for the rack itself.
Note
When installing the CDE465, use the provided AC power cords.
If DC Power Supplies Are Installed
Connection with a DC source should only be performed by trained service personnel. The CDE with DC
input is to be installed in a Restricted Access Location in accordance with articles 110-16, 110-17, and
110-18 of the National Electric Code, ANSI/NFPA 70. The DC source must be electrically isolated by
double or reinforced insulation from any hazardous AC source. The DC source must be capable of
providing up to 900 watts of continuous power per feed pair.
input is to be installed in a Restricted Access Location in accordance with articles 110-16, 110-17, and
110-18 of the National Electric Code, ANSI/NFPA 70. The DC source must be electrically isolated by
double or reinforced insulation from any hazardous AC source. The DC source must be capable of
providing up to 900 watts of continuous power per feed pair.
Caution
Do not apply AC power to DC power modules.
As a general rule, take precautions when preparing DC power cables for connection to the CDE. Make
sure to strip the power conductor insulation so that when installed, no external bare copper is accessible
at the terminal block. The torque required for the DC input terminal block connection on the power
supplies is 5 to 7 in-lb. Take precautions when connecting the polarity. The DC power input terminals
are marked as –48 V and RTN. The –48 V terminal is for the Negative (source DC –48 V or –60 V) and
the RTN is for the Positive (source DC return). After power cables have been installed, be careful to
avoid strain on the power connection. It is recommended that strain relief be provided as appropriate.
For example, route the power cables in the rack and secure the cables with nylon tie wraps.
sure to strip the power conductor insulation so that when installed, no external bare copper is accessible
at the terminal block. The torque required for the DC input terminal block connection on the power
supplies is 5 to 7 in-lb. Take precautions when connecting the polarity. The DC power input terminals
are marked as –48 V and RTN. The –48 V terminal is for the Negative (source DC –48 V or –60 V) and
the RTN is for the Positive (source DC return). After power cables have been installed, be careful to
avoid strain on the power connection. It is recommended that strain relief be provided as appropriate.
For example, route the power cables in the rack and secure the cables with nylon tie wraps.
Source DC power disconnect— You are responsible for installing a properly rated DC power disconnect
for the CDE system. This source disconnect must be readily accessible, and it must be labeled as
controlling power to the CDE. The circuit breaker of a centralized DC power system may be used as a
disconnect device when easily accessible and should be rated no more than 30 A.
for the CDE system. This source disconnect must be readily accessible, and it must be labeled as
controlling power to the CDE. The circuit breaker of a centralized DC power system may be used as a
disconnect device when easily accessible and should be rated no more than 30 A.