NSC2U Server—A
Kontron IP Network Server NSC2U
Product Guide, rev. 1.4
December 2009
138
wall AC outlet, the safety ground conductor in the power cord provides proper
grounding only for the server. You must provide additional, proper grounding for the
rack and other devices installed in it.
Overcurrent protection: The server is designed for an AC line voltage source with up to
20 amperes of overcurrent protection per cord feed. If the power system for the
equipment rack is installed on a branch circuit with more than 20 amperes of
protection, you must provide supplemental protection for the server. The overall
current rating of a configured server is less than 6 amperes.
Warning:
Do not attempt to modify or use an AC power cordset that is not the exact type
required. You must use a power cordset that meets the following criteria:
• Rating: In the U.S. and Canada, cords must be UL (Underwriters Laboratories, Inc.)
Listed/CSA (Canadian Standards Organization) Certified type SJT, 18-3 AWG
(American Wire Gauge). Outside of the U.S. and Canada, cords must be flexible
harmonized (<HAR>) or VDE (Verbena Deutscher Electrotechniker, German
Institute of Electrical Engineers) certified cord with 3x 0.75 mm conductors rated
250 VAC.
• Connector, wall outlet end: Cords must be terminated in grounding-type male plug
designed for use in your region. The connector must have certification marks
showing certification by an agency acceptable in your region and for U.S. must be
listed and rated for 125% of the overall current rating of the server.
• Connector, server end: The connectors that plug into the AC receptacle on the
server must be an approved IEC (International Electrotechnical Commission) 320,
sheet C13, type female connector.
• Cord length and flexibility: Cords must be less than 4.5 meters (14.8 feet) long.
A.2.2
If DC power supplies are installed:
Connection with a DC (Direct Current) source should only be performed by trained
service personnel. The server with DC input is to be installed in a Restricted Access
Location in accordance with articles 110-26 and 110-27 of the National Electric Code,
ANSI/NFPA 70. The DC source must be electrically isolated from any hazardous AC
source by double or reinforced insulation. The DC source must be capable of providing
up to 300 watts of continuous power per feed pair.
Mains DC power disconnect: You are responsible for installing a properly rated DC
power disconnect for the server system. This mains disconnect must be readily
accessible, and it must be labeled as controlling power to the server. The UL listed
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 10 amps.
Grounding the server: This server is intended for installation with an isolated DC return
(DC-I per NEBS GR-1089, Issue 3). To avoid the potential for an electrical shock
hazard, you must reliably connect an earth grounding conductor to the server. The
earth grounding conductor must be a minimum 14 AWG connected to the earth ground
stud(s) on the rear of the server. The safety ground conductor should be connected to
the chassis stud with a Listed closed two-hole crimp terminal having 5/8-inch pitch. The
nuts on the chassis earth ground studs should be installed with a 10 in-lbs of torque.
The safety ground conductor provides proper grounding only for the server. You must
provide additional, proper grounding for the rack and other devices installed in it.
Overcurrent protection: Overcurrent protection UL Listed circuit breakers must be
provided as part of each host equipment rack and must be incorporated in the field
wiring between the DC source and the server. The branch circuit protection shall be
rated minimum 75 Vdc, 10A maximum per feed pair. If the DC power system for the
