4-11
Cisco SCE8000 Installation and Configuration Guide, Rel 3.1.7
OL-16478-03
Chapter 4 Installing the Cisco SCE8000 Chassis
Preparing for Installation
Figure 4-12 CAB-C19-CBN
DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• 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.
Caution Do not connect the DC-return wire to the system frame or to the system grounding equipment.
Cordset rating: 16 A, 250 V
Length: 9 ft 0 in. (2.7 m)
140587
Connector:
IEC 60320 C19
Connector:
IEC 60320 C20
Table 4-5 Cisco SCE 8000 DC Power Supply Specification
Specification Acceptable Range
PWR-2700-DC/4 minimum
capability
1350W output (1750W input)
DC-input power consumption
• Single SCE8000-SCM-E module:
1000W (21A @ 48VDC, 17A @ 60VDC)
• Dual SCE8000-SCM-E modules:
1430W (30A @ 48VDC, 24A @ 60VDC)
DC-input voltage rating -48 VDC to -40VDC
(operating range: -40.5 VDC to -72 VDC)
DC-input current rating 45 A maximum at 120 VAC
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