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1. GENERAL DESCRIPTION
1.1. The Noran Tel NPGMT1012 Fuse Panel
provides up to 30 circuits for the distribution of DC
power to equipment. Each of the 30 circuits is
individually protected by a GMT style
telecommunication fuse (20A max) located on the
panel's faceplate. Alarm circuits are provided to
indicate and extend alarm conditions when faults
occur. Normal Operation LEDs are provided to
indicate the status of each bus in the panel.
1.2. Input wiring is connected to a high current, 2-
hole lug input block located at the rear of the
panel. Each group of fuses or bus has its own
completely isolated inputs, allowing the
distribution of two battery voltages through the
same panel.
1.3. The power is distributed to the load side
equipment through GMT style fuses. There are 15
fuses per fuse group and two groups per panel.
Each fuse position is available for installer
connection at the rear of the panel. A designation
card is provided for keeping records of which
position is connected to which equipment and
what amperage is to be used.
1.4. Alarm circuits are provided to alert service
personnel of fault conditions. A fuse alarm is a
blown fuse within a given bus. A red fuse alarm
LED
!
on the faceplate will illuminate when
a fuse alarm condition is present. As well, the
green Normal Operation LED
9
will extinguish
to signal a fuse alarm or input power failure and
the appropriate relay contacts will change
states. These fuse panels have common (C),
normally open (NO) and normally closed (NC)
terminals for alarms. Note, the use of the alarm
contacts is optional, if you do not wish to extend
the alarms, you don’t have to do anything with
the alarm pins. The “Normal” condition of the
relay exists when the panel is powered up
without any blown fuses.
The local alarm LEDs
are located on the front of the panel as shown in
Figure 1.4.1
LED SYMBOL
SIGNIFICANCE
GREEN
9
NORMAL OPERATION
RED
!
BLOWN FUSE
1
2
3
13
14
15
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20A MAX FUSE
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Noran Tel
By
9
9
!
Ì
!
Ì
10
20
12
Figure 1.4.1
1.5. These Fuse Panels are made from 0.050"
steel and painted off-white. Single rack
height
panels are shipped with universal brackets (1” &
1-3/4” spacing) that will fit both 19" and 23" wide
racks and use only one 1.75" panel space. The
panel has a clear L shaped plastic shield to
protect the wiring connections on the back of the
panel. The panel is shipped with 30 dummy fuses.
2. APPLICATION
2.1. The NPGMT1012 Fuse Panels are designed
to be used in the distribution of DC power. They
are rack mount panels that can provide fused DC
power to up to 30 individual circuits, or 15 pieces
of equipment, providing redundant battery feeds
to each.
2.2 The NPGMT family fuse panels are suitable
for installation as part of a Common Bonding
Network (CBN). As well, this family of fuse panels
is suitable for restricted access locations in
Network Telecommunications Facilities and OSP.
3. CIRCUIT DESCRIPTION
3.1. Power is connected to the fuse panel via ¼”
studs on 5/8” centers located at the rear of the
panel (torque 5.5 ft-lbs). These inputs are high
current stud blocks that supply current to the fuse
panel. Connect the battery return cable to the stud
input that is labeled “RTN” and the Battery supply
cable to the terminals labeled “BAT”.
3.2. Distribution of current from each bus is
provided by GMT style fuses. Each bus has 15
fuse holders for distribution, the fuses are labeled
1 to 15 on each bus. Each fuse position is made
available at the rear of the fuse panel. Maximum
fuse size allowed in each position is 20 Amps,
provided the maximum bus current or BDFB fuse
