Dc-Powered Systems - Cisco SCE8000 Installation And Configuration Manual

Chapter 4 Installing the Cisco SCE8000 Chassis
Figure 4-12
IEC 60320 C20

DC-Powered Systems

Basic guidelines for DC-powered systems include the following:
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Do not connect the DC-return wire to the system frame or to the system grounding equipment.
Caution
Table 4-5
Specification
PWR-2700-DC/4 minimum
capability
DC-input power consumption
DC-input voltage rating
DC-input current rating
OL-16478-03
CAB-C19-CBN
Connector:
Cordset rating: 16 A, 250 V
Each chassis power supply should have its own dedicated input power source. The source must
comply with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN
60950, IEC 60950 standards.
The DC supplies each have the provision for a dual connection to the power source in order to permit
high-power operation without exceeding current ratings. For the SCE8000, it is not necessary to
connect both of these inputs to DC power sources; it is sufficient to connect only the '1' connections.
Each circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should
be sized according to the power supply input rating and local or national code requirements.
The circuit breaker is considered the disconnect device and should be easily accessible.
The system ground is the power supply and chassis ground.
Cisco SCE 8000 DC Power Supply Specification
Length: 9 ft 0 in. (2.7 m)
Acceptable Range
1350W output (1750W input)
Single SCE8000-SCM-E module:
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1000W (21A @ 48VDC, 17A @ 60VDC)
Dual SCE8000-SCM-E modules:
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1430W (30A @ 48VDC, 24A @ 60VDC)
-48 VDC to -40VDC
(operating range: -40.5 VDC to -72 VDC)
45 A maximum at 120 VAC
Cisco SCE8000 Installation and Configuration Guide, Rel 3.1.7
Preparing for Installation
Connector:
IEC 60320 C19
4-11