Vertiv NetSure-48 VDC Power System 502NGFB User manual

NetSure™ -48 VDC Power System
Installation Instructions (Section 6025), Revision W
Specification Number: 582136800
Model Number: 502NGFB

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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The information contained in this document is subject to change without notice
and may not be suitable for all applications. While every precaution has been
taken to ensure accuracy and completeness herein, Vertiv Group Corp.
assumes no responsibility, and disclaims all liability, for damages resulting from
use of this information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods, tools, and
materials to be used in performing procedures not specifically described in this
document.
This document may contain confidential and/or proprietary information of
Vertiv Group Corp., and its receipt or possession does not convey any right to
reproduce, disclose its contents, or to manufacture or sell anything that it may
describe. Reproduction, disclosure, or use without specific authorization from
Vertiv Group Corp. is strictly prohibited.
Vertiv and the Vertiv logo are trademarks or registered trademarks of Vertiv
Group Corp. All other names and logos referred to are trade names, trademarks
or registered trademarks of their respective owners.
© 2019 Vertiv Group Corp. All rights reserved.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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TABLE OF CONTENTS
Admonishments Used In This Document .........................................................iii
Important Safety Instructions .............................................................................iv
General Safety..........................................................................................................................................................iv
Voltages..........................................................................................................................................................................iv
Battery..............................................................................................................................................................................iv
Handling Equipment Containing Static Sensitive Components.............................v
Static Warning .........................................................................................................vi
Customer Documentation Package .....................................................................1
Installation Acceptance Checklist....................................................................... 2
Installing the System ..............................................................................................4
General Requirements ......................................................................................................................................4
Securing the Relay Rack(s) to the Floor (if furnished) ....................................................4
Changing Orientation of Load Return Busbars (2-Row Distribution
Cabinets) ........................................................................................................................................................................7
Securing the Power System to a Relay Rack or Cabinet................................................9
Installing Distribution Devices..................................................................................................................11
Making Electrical Connections........................................................................... 16
Important Safety Instructions................................................................................................................. 16
Wiring Considerations .................................................................................................................................... 16
Relay Rack Frame Grounding Connection ................................................................................ 16
Frame Grounding Connection................................................................................................................ 16
AC Input and AC Input Equipment Grounding Connections...................................17
Attaching Brackets and AC Cords.................................................................................................... 20
External Interface Connections .............................................................................................................21
IB2 (Controller Interface Board) Connections................................................................................ 21
Remote Shunts Connections (Lists 5-8 Only) ..............................................................................29
Connecting the SM-TEMP Module to the Controller’s CAN Bus (if required)30
Ethernet Connection ...................................................................................................................................... 30
Control Bus (CAN Bus) Interconnections (List 1-4) ........................................................32
Bulk DC Output Connections (Lists 1-8).....................................................................................32
Load, C.O. Ground and Battery Connections to All Distribution Cabinets 36
Accessing Electrical Connections (All Distribution Cabinets)......................................36
Load Connections (All Distribution Cabinets) ..............................................................................36
C.O. Ground Connection (All Distribution Cabinets).............................................................. 40
Battery Connections (All Distribution Cabinets) ....................................................................... 40
Closing the Distribution Cabinet .................................................................................................................41
Load Connections to List KG GMT Load Distribution Fuse Panel.................... 41
Installing and Connecting Batteries in an Optional Battery Tray (if
furnished)................................................................................................................................................................... 43
Installing the Rectifier Modules .........................................................................47
Initially Starting the System .............................................................................. 48

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Initially Starting, Configuring, and Checking System Operation when E/W
NCU..................................................................................................................................................................................48
Initial Startup Preparation.................................................................................................................................48
Initially Starting the System............................................................................................................................48
NCU Controller Initialization...........................................................................................................................48
NCU Start Wizard......................................................................................................................................................50
Verifying the Configuration File ..................................................................................................................50
Checking Basic System Settings................................................................................................................50
Checking System Status..................................................................................................................................... 51
Configuring the NCU Identification of Rectifiers and Assigning which Input
Feed is Connected to the Rectifiers........................................................................................................ 52
NCU Alarm Relay Check .................................................................................................................................... 52
Final Steps........................................................................................................................................................................ 57
Initially Starting, Configuring, and Checking System Operation when E/W
ACU+.............................................................................................................................................................................. 58
Initial Startup Preparation................................................................................................................................. 58
Initially Starting the System............................................................................................................................ 58
ACU+ Initialization.................................................................................................................................................... 58
Verifying the Configuration File ................................................................................................................. 60
Checking Basic System Settings............................................................................................................... 60
Checking System Status.....................................................................................................................................61
Configuring the ACU+ Identification of Rectifiers and Assigning which Input
Phase is Connected to Each Rectifier....................................................................................................61
ACU+ Alarm Relay Check................................................................................................................................. 62
Final Steps........................................................................................................................................................................ 68
Initially Starting, Configuring, and Checking System Operation when E/W
SCU+...............................................................................................................................................................................69
Initial Startup Preparation.................................................................................................................................69
Initially Starting the System............................................................................................................................69
SCU+ Initialization....................................................................................................................................................69
Verifying the Configuration File ................................................................................................................... 71
Checking System Status..................................................................................................................................... 71
Configuring the SCU+ Identification of Rectifier Modules................................................. 71
SCU+ Alarm Relay Check...................................................................................................................................72
Final Steps.........................................................................................................................................................................77
Expanding the Power System ............................................................................ 78
Adding Expansion Shelves ........................................................................................................................78
Connecting a Device or System to the NCU or ACU+ CAN Bus (List 10 -
List 27) ........................................................................................................................................................................... 81
Installing the SM-TEMP Temperature Concentrator Module............................... 83
Installing the Expansion CAN Cable 562465 (List 05 - List 08) .........................87

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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ADMONISHMENTS USED IN THIS DOCUMENT
DANGER
! Warns of a hazard the reader will be exposed to that will likely result
in death or serious injury if not avoided. (ANSI, OSHA)
WARNING
! Warns of a potential hazard the reader may be exposed to that could
result in
death or serious injury if not avoided. This admonition is not used for situations that pose a
risk only to equipment, software, data, or service. (ANSI)
CAUTION
! Warns of a potential hazard the reader may be exposed to that could
result in minor or moderate injury if not avoided. (ANSI, OSHA) This admonition is not
used for situations that pose a risk only to equipment, data, or service, even if such use
appears to
be permitted in some of the applicable standards. (OSHA)
ALERT
! Alerts the reader to an action that must be avoided in order to protect
equipment, software, data, or service. (ISO)
ALERT
! Alerts the reader to an action that must be performed in order to prevent
equipment damage, software corruption, data loss, or service interruption. (ISO)
FIRE SAFETY
! Informs the reader of fire safety information, reminders, precautions,
or
policies, or of the locations of fire-fighting and fire-safety equipment. (ISO)
SAFETY
! Informs the reader of general safety information, reminders, precautions, or
policies not related to a particular source of hazard or to fire safety. (ISO, ANSI, OS
HA)

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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IMPORTANT SAFETY INSTRUCTIONS
General Safety
DANGER! YOU MUST FOLLOW APPROVED SAFETY PROCEDURES.
Performing the following procedures may expose you to hazards. These procedures should be performed by
qualified technicians familiar with the hazards associated with this type of equipment. These hazards may
include shock, energy, and/or burns. To avoid these hazards:
a) The tasks should be performed in the order indicated.
b) Remove watches, rings, and other metal objects.
c) Prior to contacting any uninsulated surface or termination, use a voltmeter to verify that no voltage or
the expected voltage is present.
d) Wear eye protection.
e) Use double insulated tools appropriately rated for the work to be performed.
Voltages
AC Input Voltages
DANGER! This system operates from AC voltage capable of producing fatal electrical shock. AC input power
must be completely disconnected from the branch circuits wiring used to provide power to the system before
any AC electrical connections are made. DO NOT apply AC power to the system until all electrical
connections have been completed and checked.
DC Input/Output Voltages
DANGER! This system produces DC Power and may require battery to be connected to it. Although the DC
voltage is not hazardously high, the rectifiers and/or battery can deliver large amounts of current. Exercise
extreme caution not to inadvertently contact or have any tool inadvertently contact a battery or output
terminal or exposed wire connected to a battery or output terminal. NEVER allow a metal object, such as a
tool, to contact more than one termination or battery terminal at a time, or to simultaneously contact a
termination or battery terminal and a grounded object. Even a momentary short circuit can cause sparking,
explosion, and injury.
Battery
WARNING! Correct polarity must be observed when connecting battery leads.
WARNING! Special safety precautions are required for procedures involving handling, installing, and
servicing batteries. Observe all battery safety precautions in this manual and in the battery instruction
manual. These precautions should be followed implicitly at all times.
WARNING! A battery can present a risk of electrical shock and high short circuit current. Servicing of
batteries should be performed or supervised only by properly trained and qualified personnel knowledgeable
about batteries and the required precautions.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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The following precautions should be observed when working on batteries:
•Remove watches, rings, and other metal objects.
•Eye protection should be worn to prevent injury from accidental electrical arcs.
•Use certified and well maintained insulated tools. Use double insulated tools appropriately rated for the
work to be performed. Ensure that wrenches with more than one working end have only one end
exposed.
•Dispose of used batteries according to the instructions provided with the batteries. Do not dispose of
batteries in a fire. They may explode.
ALWAYS FOLLOW THE BATTERY MANUFACTURER’S RECOMMENDATIONS AND SAFETY
INSTRUCTIONS.
CAUTION! Performing maintenance and/or troubleshooting procedures may interrupt power to the loads, if
battery reserve is not sufficient.
Handling Equipment Containing
Static Sensitive Components
ALERT! Installation or removal of equipment containing static sensitive components requires careful
handling. Before handling any equipment containing static sensitive components, read and follow the
instructions contained on the Static Warning Page.

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STATIC WARNING
This equipment contains static sensitive components. The warnings listed below must be observed to
prevent damage to these components. Disregarding any of these warnings may result in personal injury or
damage to the equipment.
1. Strictly adhere to the procedures provided in this document.
2. Before touching any equipment containing static sensitive components, discharge all static electricity from
yourself by wearing a wrist strap grounded through a one megohm resistor. Some wrist straps, such as Vertiv
Energy Systems’ Part Number 631810600, have a built-in one megohm resistor; no external resistor is
necessary. Read and follow wrist strap manufacturer’s instructions outlining use of a specific wrist strap.
3. Do not touch traces or components on equipment containing static sensitive components.
Handle equipment containing static sensitive components only by the edges that do not have connector
pads.
4. After removing equipment containing static sensitive components, place the equipment only on conductive
or anti-static material such as conductive foam, conductive plastic, or aluminum foil. Do not use ordinary
Styrofoam™or ordinary plastic.
5. Store and ship equipment containing static sensitive components only in static shielding containers.
6. If necessary to repair equipment containing static sensitive components, wear an appropriately grounded
wrist strap, work on a conductive surface, use a grounded soldering iron, and use grounded test equipment.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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CUSTOMER DOCUMENTATION PACKAGE
This document (Section 6025) provides Installation Instructions for NetSure ™ Power System Model 502NGFB, Spec.
No. 582136800.
The complete Customer Documentation Package consists of…
System Installation Manual
•Power System Installation Instructions: Section 6025
System User Manual
•Power System User Instructions: Section 6026
•Rectifier Instructions: UM1R482000e
•Power System “System Application Guide”: SAG582136800
•Engineering Drawings
Controller User Manual
•NCU Controller User Instructions: UM1M830BNA
•ACU+ Controller User Instructions: UM1M820BNA
•SCU+ Controller User Instructions: UM1M521BNA
For factory settings of all configurable Controller parameters, refer to the Configuration Drawing (C-drawing)
supplied with your Power System.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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INSTALLATION ACCEPTANCE CHECKLIST
Provided below is an Installation Acceptance Checklist. This checklist helps ensure proper installation and initial
operation of the system. As the procedures presented in this document are completed, check the appropriate box
on this list. If the procedure is not required to be performed for your installation site, also check the box in this list to
indicate that the procedure was read. When installation is done, ensure that each block in this list has been checked.
Some of these procedures may have been factory performed for you.
NOTE! The system is not powered up until the end of this checklist.
NOTE! Some of these procedures may have been performed at the factory for you.
Installing the System
Relay Racks (if required) Secured to Floor
Shelf(s) Secured to Relay Rack or Cabinet
Making Electrical Connections
Relay Rack Frame Grounding Connection Made
Shelf(s) Frame Grounding Connection Made
Control Bus (CAN BUS) Interconnections Made (List 1-4)
External Interface Connections Made
AC Input and AC Input Equipment Grounding Connections Made
Bulk DC Output Connections Made (List 1-8)
Load Connections Made (1-Row and 2-Row Distribution Cabinets)
CO Ground Connection Made
Battery Connections Made (1-Row and 2-Row Distribution Cabinets)
External Interface Connections Made
Digital Inputs
Relay Outputs
Temperature Probes
Remote Shunt Connections Made (For 58213680005 to 58213680008 only)
Batteries Installed and Connected in an optional Battery Tray (if furnished)
Optional External Battery Disconnect Unit Connections Made
Ethernet Connection Made (if required)

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Installing Rectifier Modules
Rectifier Modules Installed
Initially Starting the System
System Started, Configured, and Checked
Expanding the Power System
Expansion Shelves Installed
SM-TEMP Installed

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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INSTALLING THE SYSTEM
General Requirements
•This product is intended only for installation in a Restricted Access Location on or above a non-combustible
surface.
•This product must be located in a Controlled Environment with access to Crafts persons only.
•This product is intended for installation in Network Telecommunication Facilities (CO, vault, hut, or other
environmentally controlled electronic equipment enclosure).
•This product is intended to be connected to the common bonding network in a Network Telecommunication
Facility (CO, vault, hut, or other environmentally controlled electronic equipment enclosure).
•The DC return connection to this system can remain isolated from system frame and chassis (DC-I).
•The installer should be familiar with the installation requirements and techniques to be used in securing the
relay rack(s) to the floor.
•Typical industry standards recommend minimum aisle space clearance of 2'6" for the front of the relay
rack(s) and 2' for the rear of the relay rack(s).
•The installer should be familiar with the installation requirements and techniques to be used in securing the
Shelf(s) to a relay rack or cabinet.
•Rectifier and mounting shelf ventilating openings must not be blocked and temperature of air entering
rectifiers must not exceed rated Operating Ambient Temperature Range found in SAG582136800.
Securing the Relay Rack(s) to the Floor (if furnished)
Secure the relay rack(s) to the floor per site requirements. Refer to the General Requirements section at the
beginning of this section.
Ventilation Requirements
Refer to the General Requirements section at the beginning of this section.
Relay Rack Floor Mounting Dimensions
Refer to Figure 1 and Figure 2 for relay rack floor mounting dimension.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Figure 1: Relay Rack Floor Mounting Dimensions - 23” (dimensions are in inches)
Part No. 543156
Part No. 543160
Part No. 543161, 543162,
543163, 543164
17.50
20.13
24.38
2.13
3.44
9.88
12.53
15.00
1.24
2.56
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
22.500
24.750
1.125
15.000
17.500
20.125
25.000
2.437
3.750
9.871
12.531
15.031
1.250
2.580
2.00
1.00
1.00
2.00
2.00
2.00
5.00
0.437 Dia.
(12 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 1 Place)
Part No. 541340
19.685
22.310
25.800
1.760
3.073
12.34
15.000
18.000
1.500
2.830
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Figure 2: Relay Rack Floor Mounting Dimensions - 19” (dimensions are in inches)
Part No. 525003
Part No. 528183, 534653, 534654
Part No. 524961, 524963, 524988,
534651, 534652
13.50
16.13
20.38
2.13
3.44
9.88
12.53
15.00
1.24
2.56
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
18.500
20.750
1.125
15.000
14.13
16.75
21.00
2.13
3.44
9.38
12.03
15.00
1.49
2.81
2.00
1.00
1.00
2.00
2.00
2.00
5.00
0.437 Dia.
(12 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
Part No. 545645, 563922
Masked for Frame Ground Lug
0.334 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
15.69
18.31
21.80
1.76
3.07
12.34
15.00
18.00
1.50
2.83
0.812 Dia.
(8 Places)

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Changing Orientation of Load Return Busbars (2-Row Distribution Cabinets)
In all 2-row Distribution Cabinets, the installer can rotate the Load Return busbars from the factory default horizontal
orientation (for wiring through the cabinet rear) to a vertical orientation (for wiring through the cabinet top.)
NOTE! List MV is factory configured for a vertical orientation (for wiring through the cabinet top.).
This procedure requires removal of the top cover and access from the top. Therefore, the procedure should be
performed prior to mounting the cabinet in a location that inhibits top access.
CAUTION! When performing any step in this procedure that requires removal or installation of hardware, use
caution to ensure no hardware is dropped and left inside the cabinet; otherwise service interruption or
equipment damage may result.
NOTE! When performing any step in this procedure that requires removal of existing hardware, retain all
hardware for use in subsequent steps.
Procedure
1. Open the front door of the Distribution Cabinet. To do so, loosen the two captive fasteners on the door, then
pivot the door outward.
2. Remove the top cover from the Distribution Cabinet. To do so, remove the six (6) screws that secure it.
3. Refer to Figure 3.Remove the hardware securing one of the busbars. Reposition the busbar, and reinstall
the hardware. Torque hardware to the values shown in the figure.
4. Repeat step 3 for the second busbar.
5. The top cover can be installed now or after all electrical connections have been completed.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Figure 3: Rotating the Load Return Busbars in a 2-Row Distribution Cabinets
Mount Return Busbars here to route wiring
through back (factory configuration).
Mount Return Busbars here to route wiring
through top (optional configuration).
Front
LeftSideView
Front
RightSide View
Covers and
Door Omitted.
Assembly Order for Each Busbar:
Studs
Return Busbar
1/4” Flat Washer, P/N 214200700 (2 places)
1/4“ Lock Washer, P/N 215111100 (2 places)
1/4” Hex Nut, P/N 228557100 (2 places)
Torque to 75 in.-lbs.
Assembly Order for Each Busbar:
Cabinet bracket
Insulator, P/N 520764 (longer collar)
Return Busbar
Insulator, P/N 520763 (shorter collar)
3/8” Flat Washer, P/N 214112100
1/4-20 x 3/4” Screw, P/N 218708500
Torque to 84 in.-lbs.
Ensure collar on insulator
extends through washer.
Ensure collar on insulator
extends through busbar.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Securing the Power System to a Relay Rack or Cabinet
General
The Power System is designed to mount in a standard 19” or 23” wide relay rack or cabinet frame having 1” or 1-3/4”
multiple drillings. Refer to SAG582136800 for overall dimensions and a list of available relay racks.
NOTE! Refer to the General Requirements section at the beginning of this section for Ventilation
Requirements.
NOTE! For List 1-4 only , multiple Power Shelves must be stacked one above the other with no space
between the shelves (for the Controller CAN bus cable interconnection).
Procedure
1. Secure mounting angles to relay rack or cabinet at every available screw location on each side. Use a
grounding washer on each screw. Proper orientation of grounding washers enables teeth to dig into paint for
a secure ground connection. Tighten screws to 70 in.-lbs.
NOTE! Compliance with Telcordia GR-1089-CORE requires that prior to mounting the Power System
to the equipment rack:
•All paint must be removed from the front surface of each equipment rack rail where it mates with
a system mounting bracket, so that good metal-to-metal contact can be established between the
system and rack.
•The system-to-rack mating surfaces must be cleaned.
•Electrical anti-oxidizing compound must be applied to the system-to-rack mating surfaces.
Using Optional Knurr Data Cabinet Flush Mounting Bracket Kit P/N 556346
Optional Knurr Data Cabinet Flush Mounting Bracket Kit P/N 556346 consists of two brackets and hardware for
mounting a List 10 power shelf and a List FA, FB, FC, GA, GB, or GC distribution shelf into a 19” wide rack of a Knurr
data cabinet (one set of brackets mounts both shelves).
Procedure
1. Secure the mounting brackets provided with P/N 556346 to the List 10 power shelf and a List FA, FB, FC, GA,
GB, or GC distribution shelf per Figure 4.Refer to Figure 4 for torque values.
2. Secure the power shelf with distribution cabinet to the Knurr data cabinet rack using the hardware provided
with P/N 556346. Torque to 85.5 in-lbs.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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Figure 4: Installing Optional Knurr Data Cabinet Flush Mounting Bracket Kit P/N 556346
Components removed in
illustration for clarity only.
Power Cabinet
Distribution Cabinet
Secure mounting brackets to cabinets
with provided screws from the inside of
the cabinets. Torque the distribution cabinet
screws to 9.6 in-lbs. Torque the power cabinet
screws to 11.0 in-lbs.

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Installing Distribution Devices
In Distribution Cabinet
NOTE! This procedure may have already been performed at the factory.
Install distribution devices in the Distribution Cabinet in the order described in this procedure.
CAUTION! Single Row Distribution Assembly: In a +40 °C ambient, 100 A circuit breakers can be used
without a space provided the continuous current in each device does not exceed 64 A. Overcurrent
protective devices greater than 100 A shall have an empty mounting position between it and any other
overcurrent protective device.
At or above +65 °C, the maximum size overcurrent device used shall be 70 A. Devices rated at 70 A or less
shall have an empty mounting position between it and any other overcurrent protective device.”
Two Row Distribution Assembly: In a +40 °C ambient, 100 A circuit breakers can be used without a space
provided the continuous current in each device does not exceed 64 A. 100 A fuses, 150 A and 250A circuit
breakers do not require a space adjacent to it.
At or above +65°C, the maximum size circuit breaker used shall be 125 A. The maximum size fuse used shall
be 70 A. Devices rated at 50 A or greater shall have an empty mounting position between it and any other
overcurrent protective device.
Procedure
1. Open the front door of the Distribution Cabinet. To do so, loosen the two captive fasteners on the door, then
pivot the door outward.
2. If installing one or more GMT Fuse Assemblies (Part No. 545333 or 549017), install starting at the left side of
the cabinet, working toward the right. Refer to Figure 5or Figure 6 for details. Note that each GMT Fuse
Assembly occupies two distribution positions.
3. Install the circuit breakers or TPS/TLS-type fuseholders from right to left, starting with the highest capacity
and working to the lowest capacity. Refer to Figure 7 for details.
4. Record device current ratings on the label provided on the Distribution Cabinet front door.
5. For TPS/TLS fuseholders only, verify that a 0.18 amp alarm fuse is present in each fuseholder, and that a
plastic safety cover is installed on this fuse.
6. If one or more optional GMT Fuse Assemblies was installed, for each assembly:
•Install an appropriately sized GMT-type fuse in each fuse mounting position as required. If dummy fuses
are present, first remove the dummy fuse.
CAUTION! At 40°C ambient, GMT fuses greater than 10A SHALL have an empty mounting position between
it and any other fuse. At 65°C ambient, GMT fuses greater than 5A SHALL have an empty mounting position
between it and any other fuse. The maximum fuse size permitted at +65°C is 10A.
•Verify that a plastic safety cover is installed on each GMT fuse.
•Verify that dummy fuses are installed in all unused fuse positions.

Vertiv |NetSure -48 VDC Power Systems Installation Instructions (Section 6025)|Rev. W
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7. The front door of the Distribution Cabinet will be closed after all wiring connections have been completed.
Figure 5: Installing Optional GMT Fuse Assembly, Part No. 545333, in 1-Row Distribution Cabinet
Covers & front door omitted.
19” system shown.
23” system similar.
DO FIRST
Remove 2load busbars where GM T
Fuse Assembly will be installed.
While depressing tab sideways,
slide busbar up and out.
DO SECOND
Plug GMTFuse Assembly into
supply busbar
DO THIRD
Connect to return busbar
with 1/4-20 nut & lock washe r.
Torque to 72 in.-lbs.
Note: Cannot be installed in
positions 3, 4, 5, 9 or 10.