Chapter 2 Installation
Installing the NSG 9000 Platform
© 2011 Harmonic Inc.
21
bNSG 9000 & NSG 9000-3G, Rev D
2.2.5
Power Source and Wiring Specifications
2.2.5.1
Redundant power supply
When installing NSG 9000 devices with a redundant power supply, both power supply units
should be fed by different power sources:
Dual AC supplies - use two different phases of the AC power plant.
Dual DC supplies - use two distinct DC sources (A line and B line). It is highly
recommended to maintain regularity, and connect all top power supply units to the A line
and all bottom power supply units to the B line.
One AC and one DC - no additional measures are needed in order to ensure adequate
protection against power outage.
2.2.5.2
Overcurrent protection
NOTE:
Overcurrent protection devices must meet applicable national and local electrical safety codes
and be approved for the intended application.
To ensure adequate over-current protection, mount power feed lines with circuit breakers
(CB) of the appropriate rating. Power feed to the NSG9000 should be segmented as specified
below:
When using DC power supply, overcurrent protection should be provided by a fuse panel,
with a separate fuse for each individual NSG9000 unit. This fuse is meant primarily for
protecting the DC power source from damage in case of an internal power supply problem.
Two optional fuse types are recommended for the external fuse panel:
15 Amp GMT, 60 VDC/125 VAC rating, Fast-acting
15
Amp, 250 VAC rating, Slow-blow.
For additional details on AC/DC power source requirements, see
“
Wiring the –48 VDC Power
Supply
on page 36
.
Table 2-2: Overcurrent Protection
Input
Voltage
PS Part Number
Max Power
consumption
(Watts)
Max. Steady
State Current
(Amp)
Inrush
Current Draw
(Amp)
Number of Units per CB
110VAC
NSG-PS-AC-01
NSG-PS-AC-02
490
4.6
16.7
15A CB - 1 unit
20A CB - 2 units
NSG-PS-AC-03
820
9.9
30
15A CB - 1 unit
20A CB - 1 unit
220VAC
NSG-PS-AC-01
NSG-PS-AC-02
480
2.3
33.5
15A CB - 1 unit
20A CB - 2 units
NSG-PS-AC-03
820
4.6
35
15A CB - up to 2 units
20A CB - up to 3 units
48VDC
NSG-PS-DC-01
NSG-PS-DC-02
450
10.1
20
N/A
NSG-PS-DC-03
820
21.0
25
N/A
