NPT-1020 Installation and Maintenance Manual
Installing Equipment
ECI Telecom Ltd. Proprietary
4-12
7.
Disconnect the RAP-BG input power sources.
8.
Reinstall the RAP-BG front cover and fasten it using the two captive screws.
4.6.2
Installing the RAP-4B
Before You Start:
Before connecting DC power cables, see DC Power Cables.
For a description of the RAP-4B, see
NPT series Reference Manual
.
To install the RAP-4B:
1.
Prepare DC power cables.
2.
Install the RAP-4B in the prescribed location.
3.
Ground the RAP-4B to the rack grounding stud.
4.
Connect input DC power cables to the RAP-4B.
5.
Connect the DC power cables of the NPT platforms to the RAP-4B.
6.
Install circuit breakers.
7.
Check power wiring.
4.6.2.1
Preparing DC Input Power Cables
N
OTE
: According to accepted industry standards for connecting DC power, the positive lead
(+48 V) must be connected with a red cable, and the negative lead (-48 V) with a black cable.
However, according to the BS7671 (GB) and HD 308 S2:2001 (EU) standards, the positive lead
must be connected with a blue cable and the negative lead with a gray cable. In the following
sections use cables of the colors to comply with the standards in your area of residence.
The DC input power cables connect the two DC power sources and the RAP-4B source A and source B
inputs. Two cables are required, one for each source. Each cable consists of two stranded copper leads with
a cross section of 50 mm
2
(0.078 in.
2
), one red and the other black. Each lead is terminated with a
compression lug from the installation parts kit supplied with the equipment.
N
OTE
: When the RAP-4B provides power to a single platform, lower gauge cables may be
used. See DC Power Cables for DC power cable requirements.
C
AUTION
: If appropriate leads have already been prepared at the prescribed rack location,
make sure that the leads are not connected to any live voltage source before attaching the
lugs.
