Cisco MGX MGX 8800 Hardware Installation Manual page 298

Safety Requirements
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DC Power Guidelines for MGX Switches
Only a DC power source that complies with the safety extra low voltage (SELV) requirements of UL
1950, CSA C22.2 No. 950-95, EN 60950, and IEC 950 can be connected to a DC PEM in the MGX 8850
or MGX 8850/B switch.
MGX 8850 or MGX 8850/B switches equipped with DC PEM(s) are intended for installation only in a
restricted access location. In the United States, a restricted access area is one that meets the
specifications in Articles 110-16, 110-17, and 110-18 of the National Electrical Code ANSI/NFPA 70.
MGX 8850 and MGX 8850/B DC Amp Requirements
DC models for MGX 8850 and MGX 8850/B switches are equipped with DC power entry modules
(PEMs) and require you to terminate the DC input wiring on a DC source capable of supplying at least
60 A. A 60 A circuit breaker is required at the –48 VDC facility power source.
MGX 8950 DC Amp Requirements
DC models of MGX 8950 switches are equipped with DC power entry modules (PEMs) and require you
to terminate the DC input wiring on a DC source capable of supplying at least 100 A. A 100 A circuit
breaker is required at the –48 VDC facility power source.
MGX 8830 and MGX 8830/B DC Amp Requirements
DC models of MGX 8830 or MGX 8830/B systems are equipped with DC power entry modules (PEMs)
and require you to terminate the DC input wiring on a DC source capable of supplying at least 30 A. A
30 A circuit breaker is required at the –48 VDC facility power source.
Caution An easily accessible disconnect device should be incorporated into the facility wiring. Be sure to connect
the grounding wire conduit to a solid earth ground. Use of a closed loop ring is recommended for
terminating the ground conductor at the ground stud.
Cisco MGX 8800/8900 Series Hardware Installation Guide
3-6
Use the Cisco MGX AC and DC systems within the specifications provided by their marked
electrical ratings and product usage instructions.
Install the Cisco MGX AC and DC systems with the following local, national, or international
electrical codes:
United States—National Fire Protection Association (NFPA70), United States National
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Electrical Code
Canada—Canadian Electrical Code, Part 1, CSA C22.1
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Other countries—International Electromechanical Commission (IEC) 364, Part 1 through Part 7
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AC models of Cisco MGX systems are shipped with a 3-wire electrical cord with a grounding-type
plug that fits only a grounding-type power outlet. This is a safety feature that you should not
circumvent. Equipment grounding should comply with local and national electrical codes.
Chapter 3
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Preparing for Installation