Dell POWEREDGE 2950 User Manual

Dell™ PowerEdge™ 2950 Systems

Cabling Instructions for the

–48 VDC Power Supply

Dell™ PowerEdge™ 2950 系统

有关 -48 VDC 电源设备的

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Dell™ PowerEdge™ 2950 Systems

Cabling Instructions for the

–48 VDC Power Supply

www.dell.com | support.dell.com

Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of your computer.

NOTICE:

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

____________________

Information in this document is subject to change without notice.
© 2006–2007 Dell Inc. All rights reserved.

Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and Pow er Ed ge are trademarks of Dell Inc.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.
Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

March 2007 P/N GJ891 Rev. A04

This document describes the requirements and wiring instructions for a –48 VDC power cable and safety
ground wire for systems equipped with a –48 VDC power supply.

CAUTION: This equipment is designed to permit the connection of the earthed conductor of the DC supply circuit

to the earthing conductor at the equipment. See installation instructions.
This equipment is designed to permit the connection of the earthed conductor of the DC supply circuit to the
earthing conductor at the equipment. If this connection is made, all of the following conditions must be met:

– This equipment shall be connected directly to the DC supply system earthing electrode conductor or to a

bonding jumper from an earthing terminal bar or bus to which the DC supply system earthing electrode
conductor is connected.

– This equipment shall be located in the same immediate area (such as, adjacent cabinets) as any other

equipment that has a connection between the earthed conductor of the same DC supply circuit and the
earthing conductor, and also the point of earthing of the DC system. The DC system shall not be earthed
elsewhere.

– The DC supply source shall be located within the same premises as this equipment.

– Switching or disconnecting devices shall not be in the earthed circuit conductor between the DC source and

the point of connection of the earthing electrode conductor.

CAUTION: A qualified electrician must perform all connections to DC power and safety grounds. The system

must be safety grounded at the cabinet frame. All electrical wiring must comply with applicable local or national
codes and practices.

CAUTION: The system chassis must be positively grounded to the rack cabinet frame.

power to the system until grounding cables are connected.

CAUTION: An energy hazard will exist if the safety ground cable is omitted or disconnected.

Do not attempt to connect

Precaution Statements

This product is intended for restricted access locations (dedicated equipment rooms, equipment closet,
or the like) in accordance with the National Electrical Code, American National Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70.

Wire the unit with copper only, unless otherwise specified, 10 American Wire Gauge (AWG) wire rated
minimum 90ºC in parallel for source and return. Protect the

overcurrent protection rated 30-A rated for DC with a high interrupt current rating.

Connect the equipment to a

grounded 48 VDC SELV source). Ensure that the

–48 VDC supply source that is electrically isolated from the AC source (reliably

–48 VDC source is efficiently secured to earth (ground).

A readily accessible disconnect device that is suitably approved and rated shall be incorporated in the
field wiring.

CAUTION: When stranded wiring is required, use approved wiring termination, such as closed-loop or

spade-type with upturned lugs. These terminations should be the appropriate size for the wires and must be
double crimped, one on the conductor and one on the insulation.

CAUTION: When installing the unit, the ground connection must always be made first and disconnected last to

prevent an energy hazard.

Cabling Instructions for the –48 VDC Power Supply 3

–48 V (1 wire) with a branch circuit