NPT-1020 Installation and Maintenance Manual
Installing Equipment
ECI Telecom Ltd. Proprietary
4-7
6.
Install circuit breakers.
7.
Check power wiring.
4.6.1.1
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 that describe DC power cable connections, use cables of appropriate 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-BG 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
(.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-BG provides power to a single NPT platform, lower gauge cables can be
used. See
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.
To prepare a DC power cable:
1.
Strip about 22 mm (1 in.) of the red lead jacket.
2.
Insert all lead strands into the lug sleeve.
3.
Press at two or three different points on the lug sleeve using an appropriate crimping tool and die.
The recommended tools are Panduit CT-720 crimping tool with CD-720-2 die, Klauke K18 crimping
tool with D50 die, or equivalent.
It is recommended to use insulation tape (of the same color as the lead jacket) between the cable lug
and the cable itself.
4.
Repeat Steps 1 to 3 above for the black lead.
