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NPT-1020 Installation and Maintenance Manual
Before You Start
ECI Telecom Ltd. Proprietary
3-8
Some of these cables are supplied as part of the NPT-1020 equipment, while others must be prepared on
site or ordered separately from ECI.
In the following sections, you will find information about the cables, and how to prepare them on site,
where relevant. For details about the equipment connector types and cable wiring, see
W
ARNING
: When preparing cables, in particular power and grounding cables, use only
UL-listed components of the specified types. Components must also comply with any
applicable national and local safety codes and regulations.
Only qualified trained personnel may be involved in the preparation of the various cable
types. Personnel must use only approved procedures, in accordance with the applicable
workmanship practice.
3.5.1
Grounding Cables
Platform grounding is achieved by connecting the platform to the rack using rack mounting brackets.
Grounding is provided by contact when the unit is fastened to the rack.
A reliable low-impedance connection must be provided using copper conductors between the rack frame
and the site grounding bus.
Make the connection between the rack grounding screw and the site grounding bus with a 2 AWG (35 mm
2
)
or thicker copper lead with yellow/green insulation, in compliance with UL/ETSI recommendations.
Route grounding conductors along the shortest possible route. Treat the bare portion of the conductor with
antioxidant and connect a listed two-hole compression lug. If the lug is not plated, polish it until it has a
bright finish and coat it with antioxidant before connecting it to the frame of the rack. Do not mix different
types of metal conductors.
3.5.2
DC Power Cables
DC power cables must be prepared on site. Two types of DC power cables are needed:
RAP input power cables
Platform power cables
ECI recommends the use of shielded power cables for DC power connections, with the shields connected to
the frame ground at the rack end only.
3.5.2.1
RAP Input Power Cables
The RAP input power cables are prepared on site. They connect input power from the site power
distribution subsystem to the DC input terminals of the RAP.
Two input power cables are required for each rack, one for each source. The cables must use copper leads
complying with UL/ETSI recommendations. Use a red lead for the positive conductor and a black lead for
the negative conductor. The RAP cable ends must be terminated in M6 cable lugs matching the conductor
gauge.