Dc Power Supply Requirements - Eci Telecom NPT-1020 Installation And Maintenance Manual

NPT-1020 Installation and Maintenance Manual
3.6.1.1 Rack Grounding Requirements
Connect the rack to the site grounding bar with a ground cable according to ETSI recommendations
(top/bottom connection).
The rack is supplied with a main copper or brass grounding bolt welded to the rack frame. The grounding
stud is identified on the rack by the ground symbol label.
The rack grounding bolt must be connected to the site grounding bar by a 35 mm
or thicker, as short as possible, complying with UL/ETSI recommendations. The bolt must be free of paint.
The cable must be made of copper strands and terminated on both sides with bolt terminals.
N
OTE: If necessary, the gauge of the grounding lead can also be reduced to the gauge of the
RAP power leads.
The rack mounting rails must be free of paint and provide electrical continuity to the main grounding bolt.
The resistance between any rail and the rack main grounding bolt must be less than 0.1 Ω.
Pay particular attention to the area in which the RAP is attached. Remove paint from the rack in this area to
ensure efficient electrical contact.
C
AUTION: Connect the RAP grounding bolt to the rack grounding bolt with a grounding cable
complying with UL/ETSI recommendations. The cable must include bolt terminals on both
ends and be securely fastened with a nut and a star washer.

3.6.2 DC Power Supply Requirements

The NPT-1020 and EXT-2U platforms require two power sources with a nominal voltage of -48 VDC. Each
power source is protected by a UL-listed circuit breaker installed in the RAP. The required circuit breakers
are included in the installation parts kit supplied with the equipment, and therefore, their current rating is
in accordance with the order.
C
AUTION: Disconnect both power sources before service.
ATTENTION
The site operator must provide a readily accessible UL-listed disconnect device incorporated in the fixed
power wiring of the site. This device limits the maximum delivered current to a safe value.
ECI Telecom Ltd. Proprietary
: Dèbranchez les deux alimentations avant l'entretien.
Before You Start
(2 AWG) grounding cable
2
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