Westell NPGMT1012 Instructions for use

530-101738 Rev N
1012-03N
January 7, 2013
Westell
Fuse Panel
Technical Practice
NPGMT1012
15/15 GMT
NEBS Level 3 Verified
FEATURES
¾2 isolated groups (busses) of 15 GMT style fuses in each (20Amps/GMT position max).
¾Polarity insensitive (+/-24 or +/- 48 Vdc) battery voltage.
¾This panel can operate at 200 Amps of output current per panel (100 Amps per Bus).
¾Barrier terminal strips for fused outputs and isolated returns (grounds).
¾Two sets of Form C relay contacts are provided to extend alarms.
¾One set of alarm contacts for each; Bus A, and Bus B Alarm.
¾Single 1.75” mounting height (single panel space).
¾Mounting brackets are supplied for 1” & 1-3/4” spacing and are universal for 19” and 23” racks, with flush
and offset mounting options.
¾NEBS level 3 verified, with zone 4 earthquake.
¾UL Listed

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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 9will 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 9NORMAL OPERATION
RED !BLOWN FUSE
123
13 14 15
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20A MAX FUSE
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Noran Tel
By
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9
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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

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is not exceeded (each bus is rated at 100Amps
max).
3.3. Fuse Alarm circuitry provides 1 set of form
“C” contacts (C, NO and NC) for each bus (Bus A,
and Bus B). In the event of a fuse alarm or loss of
input power, the proper relay will change states,
providing a connection between the Normally
Open “NO” and Common “C” terminals for that
bus. The normally closed “NC” terminal will
open to high impedance.
4. INSTALLATION
Please read completely before beginning.
WARNING: Installation should only be performed
by an experienced Installer familiar with DC power
distribution systems.
This product must be installed within a
RESTRICTED ACCESS LOCATION where
access is through the use of a tool, lock and
key, or other means of security, and is
controlled by the authority responsible for
the location. This product must be installed
and maintained by TRAINED SERVICE
PERSONNEL ONLY.
4.1. Unpack and inspect the Noran Tel Fuse
Panel for possible damage incurred during
shipping. If damage is found, file a claim
immediately with the carrier, and notify the Noran
Tel Customer Service Department.
4.2. Once the panel is unpacked, verify that there
are three mounting brackets. The bracket with
the vertical slot is used on both 1” and 1-3/4”
spacing. There will be two brackets with
horizontal slots, these will fit 1” or 1-3/4” spacing.
All three brackets are universal for 19” and 23”
rack mount spacing (see figure 4.2.1) and can be
mounted so the panel can be installed for a flush
mounting or 5” offset. Adjust the position and
orientation of the correct mounting brackets on
the fuse panel, such that it will fit the rack you
wish to mount the panel in. Please see drawing
1012-16 on page 6 for mounting bracket
configurations.
Rack Mount Instructions:
Elevated Operating Ambient - For closed or
multi-unit rack assemblies, the operating ambient
may be greater than room ambient. Take care to
install the equipment in an environment
compatible with the maximum ambient
temperature (Tma) specified by the manufacturer.
Reduced air flow - Installation of the equipment
in a rack should be such that the amount of air
flow required for safe operation is not
compromised.
Mechanical Loading - Mounting of the equipment
in the rack should be such that a hazardous
condition is not achieved due to uneven
mechanical loading.
Circuit Overloading - Consideration should be
given to the connection of the equipment to the
supply circuit and the effect that overloading of
the circuits might have on overcurrent protection
and supply wiring. Appropriate consideration of
equipment nameplate ratings should be used
when addressing this concern.
Reliable earthing - Reliable earthing of rack-
mounted equipment should be maintained.
Particular attention should be given to supply
connections other than direct connections to the
branch circuit.
19" Mounting Position
23" Mounting Position
Figure 4.2.1
4.3. Mount the panel on the equipment rack using
the thread forming #12-24 rack mounting screws
and tooth lock washers provided.
WARNING: For safety reasons all wiring should
be done with all power sources removed (when
possible).

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Note: A readily accessible disconnect device shall
be incorporated in the building installation wiring.
4.4. Remove the distribution fuse feeding the
input cables that are to be connected to the new
panel. Attach the input cables to the input
terminal block in accordance to the National
Electrical Code, ANSI/NFPA, and Canadian
Electrical code. Hook up the input cables to the
input terminal block on the fuse panel (“BAT” &
“RTN” for each bus). Each high current input
terminal uses a two hole compression lug (1/4” on
5/8”, torque to 5.5 ft-lbs). A two hole lug must be
used for proper operation (see fig 4.4.1)
Note: The supply source must be limited to an
instantaneous short-circuit current not to exceed
450 Amps.
1415
1415
BAT
RTN
B
Figure 4.4.1
4.5. The battery outputs (“BAT”) are available at
the terminal blocks (#6 screw torque to 9 in-lbs,
up to 10awg fork) at the rear of the panel. Each
fuse position is numbered and that circuit is
available at the terminal block position with the
same number.
4.6. All battery return (“RTN”) connections are
also terminated on barrier strips (#6 screw, up to
10awg fork). Note, these returns are isolated
from the chassis frame.
4.7. This panel has Bus A, and Bus B alarm
contacts. Each alarm has a common (C),
normally open (NO) and normally closed (NC)
alarm contact. In an alarm the “C” contact will
short to the “NO” contact, and the “NC” will open.
Wire-wrap the alarm connections as per your
alarm system requirements. Noran Tel
recommends you fuse the alarm battery supply
(ABS) to 1A or less to protect the alarm wiring and
circuitry.
4.8. CHASSIS GROUND; For safety reasons,
and as recommended by NEBS, the chassis
should be electrically connected to the rack
ground. From step 4.3. the panel should already
be ground to the rack via the #12-24 thread
forming rack screws and outside tooth lock
washers. In addition to grounding via the
mounting brackets, it is recommended you ground
the chassis using a ground cable and the two ¼”
bolts and locks on back of chassis (1/4” bolt
torque; 5.5ft-lbs or 7.5Nm). Consult the National
Electric Code, ANSI/NFPA, and Canadian
Electrical code for AWG sizes.
4.9. The input wiring feeding this panel should be
protected by a Listed fuse/breaker rated for at
least 60Vdc, with a trip rating of 125 Amps Max.
With input wiring connected and this input fuse
installed, the panel should power up with the
Normal Operation LED 9illuminated and without
any red LEDs !illuminated, and the relays
should be in the “Normal” state (“C” connected to
“NC”).
4.10. If you wish to verify the fuse alarm circuit,
you can insert a blown fuse into one of the empty
fuse holders. The red Fuse Alarm
LED !should light and the Normal Operation
LED 9should extinguish and the appropriate
alarm extension relay should change states to
extend the alarm.
4.11. Install panel output distribution fuses as
required. Be sure to size fuses to no more than
70% of their rating (14A max for a 20A fuse).
Fuses are not included with this panel. Fuse
ratings should be selected to match the load
equipment ratings. Once the appropriate fuses
have been selected, the fuse information for F1-
F15 on BUS A and F1-F15 on BUS B is to be
recorded at the time of installation. Use the
provided designation card to keep a record of
which equipment is connected to which circuit and
what the fuse rating is. Be careful not to overload
the panel bus or BDFB fuse position rating
supplying the panel.
4.12 Install amperage marking labels as required
below each fuse for identification of circuit rating
(see fig 1.4.1). For fuse color codes please see
table 4.12.1

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Amps Color Code
18/100 A Yellow
2/10 A Red/Black
1/4 A Violet
3/8 A Gray/White
1/2 A Red
65/100 A Black
3/4 A Brown
1 A Gray
1 1/3 A White
1 1/2 A White/Yellow
2 A Orange
2 1/2 A White/Orange
3 A Blue
3 1/2 A White/Blue
4 A White/Brown
5 A Green
7 1/2 A Black/White
10 A Red/White
12 A Yellow/Green
15 A Red/Blue
20 A Green/White
Table 4.12.1
5. SPECIFICATIONS
5.1. Voltage -/+24 or -/+48 VDC Typical
-/+22 to -/+58 VDC Max.
5.2. Fuse Size 60Vdc, 0.18 to 20 Amps Max*
450A @60Vdc Interrupt rating
(Littelfuse Type 481 Series)
5.3. Current/Bus 100 Amps Max.**
5.4. Current/Panel 200 Amps Max.**
5.5. Output Fuse GMT Style Fuse Holders
5.6. Output/Bus 15 Fuses (30 per panel)
5.7. Output/Panel 2 Busses per Panel
5.8. Input Block Two ¼” Studs on 5/8 centers
Max std lug is 1 AWG
Max lug width = 0.710”
5.9. Output Block #22 AWG to 12 AWG wire
Or fork/ring for #6 screw,
10AWG forks/rings will work
Max lug width = 0.320”
5.10. Alarm Block 0.045” sq wire wrap pin
5.11. Relay Current 1 Amp/58Vdc max
5.12. Dimensions 1¾ H, 17 W,10½ D
(excluding brackets)
5.13. Rack Mounting 19” and 23” Racks for
1” or 1-3/4” Panel
Spaces
5.14. Weight Appx 8 Lbs
5.15. Operating Temp. -40° to +65°C
(-40° to +149°F)
5.16. Color Off White
5.17. Short Circuit withstand 450A (max)
Rating
*We recommend that you size fuses such that they do
not run at more than 70% of their rating. Thus a 20A
fuse should not be run at more than 14 A.
**The sum of the fuse ratings must not exceed the bus
rating.

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Compatible lugs for Input Block
2 hole compression lugs for 1/4” studs on
5/8” centers (torque 5.5ft-lbs) example;
Panduit® LCD1-14A 1awg wire
LCD2-14A 2awg wire
LCD4-14A 4awg wire
LCD6-14A 6awg wire
LCD8-14A 8awg wire
The Panduit® CT-1700 crimping tool can be
used for securing wire to any of these lugs.
Input wiring should be rated 90°C or better
and fused at 125% of total Bus current (ie: up
to 125Amps MAX rated input fuse/breaker)
Output lugs (locking fork recommended):
Ring or fork for #6 screw (up to 10awg).
(Torque to 9 in-lbs, use wire rated 90°C or
better.
NOTE: If fuse size is not specified in the
equipment manual, fuses should be selected
such that they do not run at more than 70%
of their rating. When installing fuses, the
sum of the fuses installed in each bus should
not exceed the bus rating (100 Amps) or
input fuse rating.
6. TECHNICAL SERVICES
6.1 If technical or customer assistance is
required, contact Westell
6.2 This equipment is identified by a
model number. Be sure to have the model
number and serial number available when
making inquiries about the equipment.
7. WARRANTY & REPAIRS
7.1 Westell warrants this product to be free
of defects at the time of shipment. Westell
also warrants this product to be fully
functional for the time period specified by the
terms and conditions governing the sale of
the product. Any attempt to repair or modify
the equipment by anyone other than an
authorized Westell representative will void
the warranty.
7.2 Westell will repair or replace any
defective Westell equipment without cost
during the warranty period if the unit is
defective for any reason other than abuse,
improper use, or improper installation. To
return defective equipment, first request a
Return Material Authorization (RMA) number
from Westell by calling or emailing
(Customer Service) at the address below.
Once an RMA number is obtained, return the
defective unit (freight prepaid), along with a
brief problem description, to the address we
will provide to you when you contact us.
Replacements will be shipped in the fastest
manner consistent with the urgency of the
situation. Westell will continue to repair or
replace faulty equipment beyond the
warranty period for a nominal charge.
Contact Westell for details.

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Noran Tel
Mounting Options
5 " OFFSET MOUNTING
FLUSH MOUNTING

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Noran Tel
C
NC
NO
BUS A
C
NC
NO
1234657811 91012131415
BUS B
1234657811 91012131415
1234657811 91012131415 1234657811 91012131415
BAT
RTN
BAT
RTN
A
B
123456789101112 123456789101112131415
POS 48 VDCNEG 24 VDC POS 48 VDCNEG 24 VDC
13 14 15
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20A MAX FUSE
BUS B BUS A
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Noran Tel
By
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9
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TRQ nuts to 5.5 ft-lbsmax TRQ nuts to 5.5 ft-lbs max
BUS
ABUS
B
10 20
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