Amphenol 250TPA08 User manual

250TPA08/nrg250TPA08
Installation Guide

2
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
Installation Guide, Part Number 150352 A3
Copyright 2021, Amphenol Network Solutions, All rights reserved.
Amphenol Network Solutions
22425 E. Appleway Ave #11
Liberty Lake, WA 99019
Amphenol Network Solutions assumes no liability from the application or use of these products.
Amphenol Network Solutions does not convey any license under its patent rights nor the patent
rights of others. This document and the products described herein are subject to change without notice.
About
Amphenol Network Solutions is a global innovative original equipment manufacturer that serves the data
and communications markets. We design, manufacture, and distribute products for customers who need an
end to end solution for network connectivity, fiber, power distribution and rack management. We collaborate
with our customers to deliver product solutions that exceed expectations with innovative designs and world
class quality. Amphenol Network Solutions is the industry thought leader on network cable management.
Telect, Inc. has been a market leader in secondary DC power distribution
for over 36 years. Through our acquisition by Amphenol and our merger
with All Systems Broadband, to become Amphenol Network Solutions, we
have continued to deliver reliable, high-quality solutions to power, protect,
and monitor today’s network servers and equipment. We are proud to be
an Amphenol company that will continue to be Powered by Telect.
Technical Support
Email: [e-mail]
Phone: [phone]

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250TPA08/nrg250TPA08
Amphenol Network Solutions
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Table of Contents
Section One: Overview................................................................................................................................ 6
1.1 About this Guide..............................................................................................................................6
1.2 nrgSMART™ ................................................................................................................................... 6
1.3 250TPA08 Configurations................................................................................................................7
1.4 250TPA08 Overview........................................................................................................................ 7
1.5 Specifications................................................................................................................................. 11
Section Two: Installation............................................................................................................................ 13
2.1 Important Installation Guidelines.................................................................................................... 13
2.2 Installation Instructions .................................................................................................................. 13
2.2.1 Mounting Brackets............................................................................................................... 14
2.2.2 Tie Bar Installation and Optional 4 Post Mounting Bracket (-C Versions)............................. 14
2.2.3 Optional Tie Bar Installation (-SC Versions)......................................................................... 15
2.2.4 Rack Mounting..................................................................................................................... 16
2.2.5 Grounding............................................................................................................................ 17
2.2.6 Input Wiring.......................................................................................................................... 18
2.2.7 Remove Front Cover............................................................................................................ 19
2.2.8 Alarming .............................................................................................................................. 19
2.2.9 Installing Fuses.................................................................................................................... 21
2.2.10 Blanking Cover .................................................................................................................. 22
2.2.11 Alarm Terminals................................................................................................................. 22
2.2.12 nrgSMART Connectivity (-CTRL Versions) ........................................................................ 23
2.2.13 Output Wiring (Terminal Block Versions) ........................................................................... 25
2.2.14 Output Wiring (Connectorized Versions)............................................................................ 26
2.2.15 Install Rear Cover.............................................................................................................. 28
2.3 TPA Fuse Holder PN: 307492........................................................................................................ 30
2.3.1 Replacing Fuses.................................................................................................................. 30
2.4 Blanking Cover .............................................................................................................................. 30
2.5 Breaker Puller................................................................................................................................ 31
2.5.1 Removing Circuit Breakers .................................................................................................. 31
2.6 Contact Removal Tool ................................................................................................................... 31
2.7 Tie Bar (-C Versions)..................................................................................................................... 32
2.8 Tie Bar with 4 Post Mounting Brackets (-C Versions)..................................................................... 32
2.9 Tie Bar (-SC Versions)................................................................................................................... 32
2.10 Temperature Probes (nrgSMART Versions)................................................................................. 33

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250TPA08/nrg250TPA08
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2.11 nrgNET Pinouts (nrgSMART Versions)........................................................................................ 34
2.11.1 nrgNET Pinouts (Legacy)................................................................................................... 34
2.11.2 nrgNET Pinouts (Integrated Controller).............................................................................. 35
2.12 Parts & Accessories..................................................................................................................... 36
2.12.1 Ordering Information.......................................................................................................... 36
2.12.2 TPA Fuses and Circuit Breakers........................................................................................ 37
2.12.3 Lug Reference Guide......................................................................................................... 38
Section Three: Drawings ........................................................................................................................... 39
3.1 250TPA08 Drawings...................................................................................................................... 39
Section Four: Notices (nrgSMART Versions)............................................................................................. 47
4.1 FCC Class A Notice....................................................................................................................... 47
4.2 ICES-003 Class A Notice –Avis NMB-003, Class A ...................................................................... 47
List of Figures
Fig. 1-1: 250TPA08-16F Front View ............................................................................................................ 8
Fig. 1-2: nrg250TPA08-CTRL-16F Rear View ............................................................................................. 8
Fig. 1-3: nrg250TPA08-SENS-C-16F Front View.........................................................................................8
Fig. 1-4: 250TPA08-C-16F Rear View......................................................................................................... 9
Fig. 2-1: Installing Mounting Brackets........................................................................................................ 14
Fig. 2-2: Installing -C Tie Bar..................................................................................................................... 14
Fig. 2-3: Installing Optional 4 Post Mounting Brackets............................................................................... 15
Fig. 2-4: Installing Optional -SC Tie Bar..................................................................................................... 15
Fig. 2-5: Installing Panel in Rack ............................................................................................................... 16
Fig. 2-6: Grounding Lug Connection.......................................................................................................... 17
Fig. 2-7: Input Lugs.................................................................................................................................... 18
Fig. 2-8: Removing the Front Cover........................................................................................................... 19
Fig. 2-9: DIP Switches............................................................................................................................... 19
Fig. 2-10: nrg250TPA08 LED Status.......................................................................................................... 20
Fig. 2-11: Remove Fuse Holder................................................................................................................. 21
Fig. 2-12: Installing Fuse ........................................................................................................................... 21
Fig. 2-13: Blanking Cover.......................................................................................................................... 22
Fig. 2-14: nrg250TPA08 Alarm Terminals.................................................................................................. 22
Fig. 2-15: CTRL Panel Connectivity Ports ................................................................................................. 24
Fig. 2-16: Output Lugs............................................................................................................................... 25
Fig. 2-17: Insert Crimped Terminals........................................................................................................... 26
Fig. 2-18: Connector Front View................................................................................................................ 26
Fig. 2-19: Insert Retainer........................................................................................................................... 26
Fig. 2-20: Insert Connector........................................................................................................................ 27

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250TPA08/nrg250TPA08
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Fig. 2-21: Rear Cover (Standard Versions)................................................................................................ 28
Fig. 2-22: Rear Cover (-C Versions).......................................................................................................... 29
Fig. 2-23: Rear Cover (-SC Versions)........................................................................................................ 29
Fig. 2-24: Included TPA Fuse Holder PN: 307492..................................................................................... 30
Fig. 2-25: Optional Blanking Cover PN: 150203+03 .................................................................................. 30
Fig. 2-26: Optional Circuit Breaker Puller PN: 307491............................................................................... 31
Fig. 2-27: Optional Contact Removal Tool PN: 150797.............................................................................. 31
Fig. 2-28: Tie Bar (Included with -C Versions) ........................................................................................... 32
Fig. 2-29: Tie Bar with Optional 4 Post Mounting Brackets (-C Version Only) PN: 307622 ........................ 32
Fig. 2-30: Optional Tie Bar (-SC Versions) PN: 307661............................................................................. 32
Fig. 2-31: Optional nrgTEMP Temperature Probe (nrgSMART Versions) PN: nrgTEMP ........................... 33
Fig. 2-32: nrgNET Pinout Connections (Legacy)........................................................................................ 34
Fig. 2-33: nrgNET Pinout Connections (Integrated Controller)................................................................... 35
Fig. 3-1: Front View (Passive Versions)..................................................................................................... 39
Fig. 3-2: Front View (nrgSMART -CTRL Versions) .................................................................................... 39
Fig. 3-3: Front View (nrgSMART -SENS Versions).................................................................................... 39
Fig. 3-4: Side View (Standard and -SC Versions)...................................................................................... 39
Fig. 3-5: Side View (-C Versions)............................................................................................................... 40
Fig. 3-6: Rear View (250TPA08-16F)......................................................................................................... 40
Fig. 3-7: Rear View (nrg250TPA08-CTRL-16F and nrg250TPA08-SENS-16F) ......................................... 40
Fig. 3-8: Rear View (250TPA08-C-16F)..................................................................................................... 40
Fig. 3-9: Rear View (nrg250TPA08-CTRL-C-16F and nrg250TPA08-SENS-C-16F).................................. 41
Fig. 3-10: Rear View (250TPA08-SC-16F)................................................................................................. 41
Fig. 3-11: Rear View (nrg250TPA08-CTRL-SC-16F and nrg250TPA08-SENS-SC-16F) ........................... 41
Fig. 3-12: Bottom View (Standard Versions).............................................................................................. 42
Fig. 3-13: Bottom View (-C Versions)......................................................................................................... 43
Fig. 3-14: Bottom View (-SC Versions)...................................................................................................... 44
Fig. 3-15: Optional 4 Post Mounting Bracket (-C Versions)........................................................................ 45
Fig. 3-16: Optional Tie Bar (-SC Versions)................................................................................................. 46

6
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
Section One: Overview
1.1 About this Guide
This manual provides a comprehensive overview of and installation guidelines for the 250TPA08 family of
power distribution panels. While care has been taken to define all necessary information, complete details may
not be covered. If you have any questions, contact Amphenol Network Solutions Technical Support at
[e-mail] or call 1-509-926-6000.
Throughout this guide, select information is highlighted in the form of Notes, Alerts, Cautions, and Warnings.
These notifications are prominent, and their importance is indicated as follows:
NOTE: General information to which the user should pay special attention.
ALERT! Important information and/or instructions to which the user should adhere.
CAUTION! Indicates a hazardous situation, which could result in minor or moderate injury.
WARNING! Indicates a hazardous situation, which could result in death or serious injury.
Amphenol Network Solutions assumes no liability from the application or use of these products. Amphenol
Network Solutions does not convey a license under its patent rights, nor the patent rights of others. This
document and the products described herein are subject to change without notice.
1.2 nrgSMART™
nrgSMART describes the family of distributed network monitoring and management products, from BDFBs to
high-current and low-current secondary panels. nrgSMART allows you to collect performance data on
distributed assets and tools to help you efficiently access business critical and actionable information.
Amphenol Network Solutions recognizes the industry need to manage distributed assets more efficiently, get
better power performance out of deployed assets, as well as pursue realistic and achievable alternative energy
goals. Through nrgSMART, access to data at the equipment level provides the foundation for managing
performance of a distributed DC power distribution system.
•Individual circuit monitoring: Measure power at the circuit level. This enables powerful trend analysis
and insights into equipment performance and enables preventative maintenance processes.
oHigh accuracy, 100% passive monitoring, with no calibration required.
oCollect voltage and current for both feed and output circuit.
oCollect temperature using optional nrgTEMP probes.
•Network data collection: Intelligent interpretation of the collected data, based on equipment data
signature (smart alarms), drives relevant business decisions.

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250TPA08/nrg250TPA08
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1.3 250TPA08 Configurations
TPA Fuse Panel:
Part Number:
250A Dual-Feed, 8/8 Panel, Vertical Inputs, Output Terminal Blocks
250TPA08-16F
250A Dual-Feed, 8/8 Panel, Horizontal Inputs, Connectorized Outputs,
Standard Tie Bar (Connectors purchased separately)
250TPA08-C-16F
250A Dual-Feed, 8/8 Panel, Vertical Inputs, Connectorized Outputs (Tie
Bar and Connectors purchased separately)
250TPA08-SC-16F
nrgSMART Circuit Monitoring, 250A Dual-Feed, 8/8 Panel, Vertical Inputs,
Output Terminal Blocks
nrg250TPA08-16F
nrgSMART Circuit Monitoring, Controller, 250A Dual-Feed, 8/8 Panel,
Vertical Inputs, Output Terminal Blocks
nrg250TPA08-CTRL-16F
nrgSMART Circuit Monitoring, Sensor, 250A Dual-Feed, 8/8 Panel,
Vertical Inputs, Output Terminal Blocks
nrg250TPA08-SENS-16F
nrgSMART Circuit Monitoring, 250A Dual-Feed, 8/8 Panel, Horizontal
Inputs, Connectorized Outputs, Standard Tie Bar (Connectors purchased
separately)
nrg250TPA08-C-16F
nrgSMART Circuit Monitoring, Controller, 250A Dual-Feed, 8/8 Panel,
Horizontal Inputs, Connectorized Outputs, Standard Tie Bar (Connectors
purchased separately)
nrg250TPA08-CTRL-C-16F
nrgSMART Circuit Monitoring, Sensor, 250A Dual-Feed, 8/8 Panel,
Horizontal Inputs, Connectorized Outputs, Standard Tie Bar (Connectors
purchased separately)
nrg250TPA08-SENS-C-16F
nrgSMART Circuit Monitoring, Controller, 250A Dual-Feed, 8/8 Panel,
Vertical Inputs, Connectorized Outputs (Tie Bar and Connectors
purchased separately)
nrg250TPA08-CTRL-SC-16F
nrgSMART Circuit Monitoring, Sensor, 250A Dual-Feed, 8/8 Panel,
Vertical Inputs, Connectorized Outputs (Tie Bar and Connectors
purchased separately)
nrg250TPA08-SENS-SC-16F
1.4 250TPA08 Overview
The Amphenol Network Solutions 250TPA08 family of 1RU, dual-feed 250A per feed, power distribution panels
provide high-capacity, ±48V, ±24V, and ±12V power protection for secondary power distribution to data and
communications equipment. The Amphenol Network Solutions 250TPA08 family panels are also ideal for
primary distribution in small central offices and at remote sites.

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250TPA08/nrg250TPA08
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Fig. 1-1: 250TPA08-16F Front View
Fig. 1-2: nrg250TPA08-CTRL-16F Rear View
Fig. 1-3: nrg250TPA08-SENS-C-16F Front View

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This panel accommodates Cooper Bussmann TPA fuses. As an optional accessory, AIRPAX 1U circuit breakers can be
used as an alternate to TPA fuses. The panel has positions for 16 bullet-style, plug-in fuse holders or breakers. These
1RU fuse holders feature an ergonomic front grip for easy removal, sliding top cover to protect the fuse from above, and
red alarm plunger to indicate a failed fuse. Circuit breakers are an optional accessory that can be installed with a
protective cover to protect against unintended on or off switching. Circuit breaker covers are not included with breakers
and must be purchased separately. The panel is UL rated using 50A TPA fuses with a maximum continuous output load
of 40A. The panel is not UL rated using breakers but can accommodates 60A circuit breakers with a maximum continuous
output load of 48A. TPA fuses and breakers are sold separately. See amphenol-ns.com to order TPA fuses and
breakers.
Sides A and B are electrically isolated including the alarm card, which contains power and TPA fuse status
relays with dry, Form-C contacts. The contacts are connected to wire-wrap pins for connecting to external
visual/audio alarms. Pins can also mate to a TE Connectivity 3-640428-3 connector. The alarm card also
controls the four indicator LEDs on the front panel.
This panel is available with standard terminal block outputs or connectorized outputs. All input, output and
alarm terminals are within the panel.
For the standard configurations, the feed inputs are vertical dual stud terminals, and the outputs are staggered
terminal blocks to accommodate waterfall cable management. The BATT and RTN inputs accommodate dual-
hole lugs and the outputs accommodate single-hole lugs. The input terminals are studs, while the output
terminals are screws.
For the -C configurations, the feed inputs are horizontal busbars, and the outputs are connectors. This allows
input and output cables to exit straight back from the panel. The BATT and RTN inputs accommodate dual-
hole lugs. The input landings have holes with 5/8” to 1” spacing. The outputs accommodate connectors that
are easily assembled during installation.
For the -SC configurations, the feed inputs are vertical dual stud terminals, and the outputs are connectors.
The input cables can be routed directly from above and the output cables exit straight back from the panel. The
BATT and RTN input terminals are studs and accommodate dual-hole lugs. The outputs accommodate
connectors that are easily assembled during installation.
The ground terminals can accommodate either dual-hole or single-hole lugs. The ground terminals are bolt
connections on the sides of the panel, near the rear, and on the bottom of the panel, near the center rear. Only
one ground connection is required.
Fig. 1-4: 250TPA08-C-16F Rear View

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The nrgSMART panels are now available with an integrated controller, designated with a “CTRL” in the part
number. This embeds a primary controller directly into the fuse panel, eliminating the need for a separate
external controller. For customers that desire 1-point connectivity to a single controller for multiple panels,
nrgSMART Sensor panels can be connected to the Controller (CTRL) panel. These Sensor panels are
designated with “SENS” in the part number. The Sensors panel contain all required nrgSMART sensing
electronics but do not contain the controller electronics. The nrgSMART electronics of Controller and Sensor
panels are powered directly off the A and B feeds, while legacy panels are powered off the primary separate
external controller through the nrgNET cable. Since, the CTRL panel does not provide power through the
nrgNET cable, legacy panels cannot be connected to it. Sensor panels are capable of being daisy chained with
legacy nrgCONTROL-BT external controllers. The nrgCONTROL-BT still requires the use of a service link.
NOTE: Do not connect multiple CTRL panels together.
NOTE: Do not connect a CTRL panel to an nrgCONTROL-BT external controller.
For flexibility, a Sensor panel can be upgraded to include an integrated Controller, and a CTRL panel can be
downgraded to a SENS panel. Changes can be made in the field by exchanging a circuit board and front
panel. Contact Amphenol Network Solutions for more details.

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1.5 Specifications
Inputs:
Specifications:
Voltage range (nominal voltage)
±12VDC, ±24VDC and ±48VDC
Max. input load rating
250A @ 45°C per panel (De-rated to 180A @ 65°C)
Short circuit withstand rating
5000A
Nominal power loss at full load
Less than 45W per side @12,000W full load per side (250A x 48V);
250A @ 45°C per panel
Percentage of full power dissipation at nominal
voltage
Less than 0.5%
Max. input interrupt device
125% of panel rating (for 250A rated feeds)
Optional (Standard and -SC versions): Vertical input
terminal studs (with Keps nuts and flat washers) for
dual-hole compression lugs
Two pairs of 3/8-16 studs on 1" centers per terminal [max. lug width of 1.15"
(29.2 mm)]. Torque nut (using 9/16" or 15 mm socket) to 150 in/lb. (~17
N•m), max.
Optional (-C Versions): Horizontal input terminal
landings (with Keps nuts, flat washers, and bolts) for
dual-hole compression lugs
Two pairs of 3/8” holes on 5/8”-1" centers per terminal [max. lug width of 1.5"
(38.1 mm)]. Torque bolt and nut (using 9/16" or 15 mm sockets) to 150 in/lb.
(~17 N•m), max.
Input wire size
2/0 AWG to 350 MCM
Grounding:
Specifications:
Earth GND terminal bolts (with washers) for dual-
hole compression lug
Three sets of 1/4-20 threaded holes on 5/8" centers. Torque bolts (using 7/16"
or 12 mm socket) to 50 in/lb. (5.6 N•m), max.
Ground wire size
#6 AWG to #1 AWG
Outputs:
Specifications:
Output fuse
50A TPA Fuse
60A Circuit Breaker
Output load
40A continuous TPA Fuse
48A continuous Circuit Breaker
Minimum short circuit interrupt rating
5000A
Optional (Standard Versions): Terminal blocks,
single-hole compression lugs
16, #10-32 screws [max. lug width of .50" (12.7)]. Torque screw to 20 in/lb.
(2.3 N•m), max.
Optional (Standard Versions): Output wire size,
single-hole compression lug
#14 AWG to #4 AWG
Optional (-C and -SC Versions): Connectors
(purchased separately)
16, P40 connector plugs, latching, safe touch
Optional (-C and -SC Versions): Output wire size,
connectors
#12 AWG to #6 AWG
TPA fuses
Cooper Bussmann
Circuit Breaker
AIRPAX 1U Series
Alarms:
Specifications:
Alarm relay contacts
2A @ 30VDC; 0.6A @ 60VDC
Max. alarm card power rating
@12V: 18 mA (0.22W); @24V: 20 mA (0.48W); @48V: 30 mA (1.44W)
Alarm wire size
#24 AWG, typical (#26 to #20 AWG)
Alarm terminals
Wire wrap or mates with TE Connectivity 3-640428-3

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Dimensions:
Specifications:
250TPA08/nrg250TPA08 Height:
Depth:
Width:
250TPA08-C/nrg250TPA08-C Height:
Depth:
Width:
250TPA08-SC/nrg250TPA08-SC Height:
Depth:
Width
1.75" (44 mm)
13.5" (344 mm)
17.0" (432 mm) without brackets
19” and 23” brackets included with panel
1.75" (44 mm)
18.7" (475 mm) without tie bar
21.9" (557 mm) with tie bar
17.0" (432 mm) without brackets
19” and 23” brackets included with panel
Tie bar included with panel
Cable-end connectors not included with panel
1.75" (44 mm)
13.5" (344 mm) without tie bar
17.0” (432mm) with tie bar
17.0" (432 mm) without brackets
19” and 23” brackets included with panel
Tie bar and cable-end connectors not included with panel
Compliance:
Specifications:
UL
Listed (TPA Fuses Only)
NEBS
Level 3
Voltage Sensor (nrgSMART model only):
Specifications:
Sensor accuracy
-19.99 to +19.99V: ± 0.3V
-20V to -60V: ± 0.1V
+20V to +60V: ± 0.1V
Voltage measurement range
-60 to +60 VDC
NOTE:
• Voltage measurement may be slightly different than at input terminal blocks due to the voltage drop within the panel.
• Sensors are factory calibrated and do not require user adjustment.
Current Sensor (nrgSMART model only):
Specifications:
Precision / accuracy
±5% precision, ±0.25A accuracy
Example: 40A current, will measure 40A ± (40A*5%) ± 0.25A
= 40A ± 2.0A ± 0.25A
= 37.75A to 42.25A
Communication (nrgSMART model only):
Specifications:
nrgOS minimum required version
nrgOS 4.1.0
nrgNET communication protocol
Proprietary serial protocol used to communicate between panels and
controller
nrgNET connector
Removable 5-pin connector with screw down terminals
nrgNET connector functions
nrgNET IN from the Controller or upstream nrgSMART panel, nrgNET OUT
to downstream nrgSMART panel

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Section Two: Installation
2.1 Important Installation Guidelines
•Elevated Operating Ambient Temperature: If installed in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be greater than room ambient. Consider
installing the equipment in an environment compatible with the maximum ambient temperature (Tma)
specified by the manufacturer.
•Reduced Air Flow: Maintain the amount of air flow required for safe operation when installing the
equipment in a rack.
•Mechanical Loading: Ensure mechanical loading is even to prevent hazardous conditions.
•Circuit Overloading: Overloading circuits may affect your overcurrent protection and supply wiring. Use
equipment nameplate ratings.
•Reliable Earthing: Maintain reliable earthing of rack-mounted equipment. Pay attention to supply
connections other than direct connections to the branch circuit.
•Disconnect Device: Incorporate a readily accessible disconnect device in the building installation wiring.
2.2 Installation Instructions
ALERT! Only qualified technicians may install and maintain this product. Verify all connections meet
requirements specified in local electric codes or operating company guidelines before supplying
power. Protect this equipment with a breaker sufficient to interrupt power levels specified.
ALERT! Verify all connections meet requirements specified in local electric codes or operating
company guidelines before supplying power. Unit shall be protected by a listed circuit breaker or
branch-rated fuse rated minimum 125% of panel rating (for 250A rated feeds).
ALERT! Install this product in locations accessible only to qualified personnel.
Please read these instructions carefully before beginning installation. If assistance is required, call Amphenol
Network Solutions Technical Support at 1-509-926-6000 or email us at [e-mail].
When you receive the equipment, carefully unpack it and compare it to the packaging list. Please report any
defective or missing parts to Amphenol Network Solutions Quality at [email protected]m or call 1-509-
926-6000.
Amphenol Network Solutions is not liable for transit damage. If the product is damaged, please report it to the
carrier and contact Amphenol Network Solutions Quality.
NOTE: For service or warranty information, please visit amphenol-ns.com and click on the support tab, email
Amphenol Network Solutions at [e-mail] or call us at 1-509-926-6000.
NOTE: The 250TPA08 family is suitable for installation as part of a Common Bonding Network (CBN) for
installation in Network Telecommunication Facilities and OSP.
NOTE: The 250TPA08 family is DC-I and can be grounded in both CBN and IBN networks. All feeds have
isolated returns and the chassis grounds are isolated from all returns. The 250TPA08 family is suitable
for installation in Network Telecommunication Facilities and in locations where the NEC applies.

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2.2.1 Mounting Brackets
1. The mounting brackets can be installed in 6 positions, from flush to 5 inch offset in 1 inch increments. Use
included hardware to install the mounting brackets. Both 19” and 23” mounting brackets are included.
2. Tighten screws to 20 in/lb. (2.23 N•m).
2.2.2 Tie Bar Installation and Optional 4 Post Mounting Bracket (-C Versions)
3. Use included undercut hardware to install tie bar. Standard tie bar is included in -C connectorized panels.
4. Tighten screws to 20 in/lb. (2.3 N•m).
Fig. 2-1: Installing Mounting Brackets
Fig. 2-2: Installing -C Tie Bar

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5. 4 post mounting brackets are an optional accessory for -C connectorized panels and are purchased
separately. Slide 4 post mounting brackets into the tie bar. This step can also be done after the front of the
panel is mounted in the rack.
2.2.3 Optional Tie Bar Installation (-SC Versions)
6. Tie bar is an optional accessory for -SC connectorized panels and is purchased separately. Use hardware
included in accessory kit to install tie bar.
7. Tighten screws to 20 in/lb. (2.3 N•m).
Fig. 2-3: Installing Optional 4 Post Mounting Brackets
Fig. 2-4: Installing Optional -SC Tie Bar

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2.2.4 Rack Mounting
8. Locate an unused rack position and mount the panel using two sets of fasteners per side, as shown in Fig.
2-5. Mount the panel as high as possible on the rack. Use a seismic rack for best rigidity.
9. Tighten screws to 35 in/lb. (3.9 N•m).
Fig. 2-5: Installing Panel in Rack

17
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
2.2.5 Grounding
WARNING! Failure to properly ground this equipment can create hazardous conditions to installation
personnel and to the equipment.
ALERT! Only use components and crimping tools approved by agencies or certifying bodies
recognized in your country or region such as Underwriter’s Laboratories (UL), TUV, etc.
10. Use an approved crimping tool to attach an approved, dual-hole compression lug onto suitable grounding
wire. (Size of ground depends on input interruption device.)
11. If required, lightly coat antioxidant on lug and grounding surface on the side or bottom of the panel.
Connect the lug using 1/4-20 bolts, split washers and flat washers provided, as shown in Fig. 2-6.
12. Tighten the bolt to 50 in/lb. (5.6 N•m).
Fig. 2-6: Grounding Lug Connection

18
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
2.2.6 Input Wiring
WARNING! Before connecting input power cables, make sure input power to the panel is turned off.
13. Make sure input power is off before connecting the panel’s input cables to the PDU or battery.
14. For input wiring, crimp dual-hole compression lugs onto 2/0 AWG to 350 MCM copper wires. The choice of
input wiring depends on the following criteria:
•Input interrupt device rating affects the size of input wiring.
•Ambient operating temperature affects the type of input wire insulation. For further information,
consult the National Electrical Code (NEC).
15. Insulate the lug barrels with UL94 V-0 rated heat-shrink tubing.
16. Clean terminals and lugs with a non-abrasive, non-metallic pad.
17. If required, lightly coat antioxidant on lugs and input BATT and RTN terminals and then connect lugs to
input terminals, as shown in Fig. 2-7.
18. Tighten nut to 150 in/lb. (~17 N•m), max.
Fig. 2-7: Input Lugs

19
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
2.2.7 Remove Front Cover
19. Remove front cover by unscrewing thumb screws or using Phillips screwdriver, as shown in Fig. 2-8. Once
the front cover has been taken off the panel, remove and discard the small pink packaging foam piece
inside the front cover.
2.2.8 Alarming
20. When installing fuses into the fuse holders, turn on the corresponding DIP switch by flipping the switch
on (down position). This will turn on the alarming function for the fuses that are installed. If a fuse is not
installed, that corresponding DIP switch needs to be turned off (up position) to prevent false alarming.
They are numbered 1-8 for both sides A and B that corresponds to the adjacent fuse holder.
NOTE: For nrgSMART panel only. When removing or installing new fuse holders, ensure the changes are
updated in the nrgSMART configuration wizard.
Fig. 2-8: Removing the Front Cover
Fig. 2-9: DIP Switches

20
250TPA08/nrg250TPA08
Amphenol Network Solutions
All rights reserved. 2.12.2021 150352
509.926.6000 —amphenol-ns.com
21. With all the TPA fuse holders empty, enable the breaker at the
primary distribution unit or battery, 125% of panel rating (for
250A rated feeds) to turn on Feed A to Side A of the panel.
Check voltage and polarity at input connectors of the panel.
Verify the following:
•A PWR LED on the front of panel turns green
•A ALM LED on the front of panel turns red
•B PWR LED remains off
•B ALM LED remains off
22. With A PWR LED green (normal operation) and A ALM LED
red (alarm state) —but with B PWR LED and B ALM LED off
—test ALM relay and contact alarm terminals:
•Expect an open circuit (∞Ω) between terminals C and NC
•Expect continuity (0Ω) between terminals C and NO
23. With no output wires connected or with the output loads (devices fed by this panel) disabled, install fuses
into the fuse holders, see section 2.2.9.
Verify the following:
•A PWR LED on the front of panel turns green
•A ALM LED turns off
•B PWR LED remains off
•B ALM LED remains off
24. If A ALM LED is red, verify that all of the DIP switches for all empty fuse positions are up (OFF).
25. With A PWR LED green (normal operation) and A ALM LED off (normal state) —but with B PWR LED and
B ALM LED off —test A ALM relay and contact terminals:
•Expect continuity (0Ω) between terminals C and NC
•Expect an open circuit (∞Ω) between terminals C and NO
26. Repeat steps 20-25 to power up side B. A PWR and B PWR LEDs must both be green.
NOTE: Step 27 is for nrgSMART model only.
27. Connect nrgNET cable to the rear of the panel. The nrg LED will have the following conditions.
•nrg LED is off: No power supplied from nrgNET cable.
•nrg LED is red: Power supplied from nrgNET cable, no communication to Controller.
•nrg LED is green: Power supplied from nrgNET cable, active communication to Controller.
•nrg LED is flashing red: Power supplied from nrgNET cable, error in communication to Controller .
28. Reinstall the cover to the front of the panel using the thumb screws or a Phillips screwdriver.
A PWR
LED
B ALM
LED
A ALM
LED
B PWR
LED
Fig. 2-10: nrg250TPA08 LED
Status
nrg
LED