Electro Industries/GaugeTech Nexus 1262 User manual

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Nexus® 1262/1272 Meter Installation and Operation Manual Version 1.29
Published by:
Electro Industries/GaugeTech
1800 Shames Drive
Westbury, NY 11590
All rights reserved. No part of this publication may be reproduced or transmitted in
any form or by any means, electronic or mechanical, including photocopying, record-
ing, or information storage or retrieval systems or any future forms of duplication, for
any purpose other than the purchaser's use, without the expressed written permission
of Electro Industries/GaugeTech.
© 2021 Electro Industries/GaugeTech
Nexus®, Shark®, CommunicatorPQA®, MeterManagerPQA®, EnergyPQA.com®, and
EnergyPQA® are registered trademarks of Electro Industries/GaugeTech. V-SwitchTM
is a trademark of Electro Industries/GaugeTech.
Modbus® is a registered trademark of Schneider Electric, licensed to the Modbus
Organization, Inc.

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Customer Service and Support
Customer support is available 8:00 am to 8:00 pm, Eastern Standard Time, Monday
through Friday. Please have the model, serial number and a detailed problem descrip-
tion available. If the problem concerns a particular reading, please have all meter
readings available. When returning any merchandise to EIG, a return materials
authorization number is required. For customer or technical assistance, repair or
calibration, phone [phone] or fax [phone].
Product Limited Warranty Certificate
1.Electro Industries/Gauge Tech ("Electro") warrants its metering products ("the
Product") against defects in material and workmanship, subject to the terms and con-
ditions stated herein. This limited warranty extends to and covers only the Customer,
as the purchaser of Electro's Product; the Customer represents and warrants to Elec-
tro that the Customer is subject to and bound by the limited warranty and disclaimer
of warranty contained herein.
2.PRODUCT LIMITED WARRANTY
Electro warrants that commencing from the Product's date of delivery (the date the
Product leaves Electro's manufacturing facility) and continuing immediately following
thereafter for a period of four (4) consecutive years, that the Product will be free from
defects in material and workmanship, and except for the foregoing, the Product is sold
AS IS with all faults. This warranty does not apply to defects resulting from unautho-
rized modification, misuse, or use of the Product for any use other than electrical
power monitoring, which is the intended and normal use of the Product. The Cus-
tomer's sole and exclusive remedy and the entire liability of Electro under this limited
warranty will be, at Electro's option, as follows: (i) the Product's repair; or (ii) ship-
ment of a replacement Product within the above stated warranty period. To exercise
this limited warranty, the Customer must give notice (See Section 5) to Electro's cus-
tomer-support department and give additional notice to Electro's customer-support
department by facsimile or by telephone for Electro's instructions for the Product's
return or repair. If the Product is repaired, Electro will ship the repaired Product to the
Customer. THE FOREGOING WARRANTIES ARE THE SOLE WARRANTIES, EXPRESS OR
IMPLIED, GIVEN BY ELECTRO IN CONNECTION WITH THE PRODUCT, AND ELECTRO
DISCLAIMS ALL OTHER WARRANTIES, INCLUDING BUT NOT LMITED TO WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
OF THIRD-PARTY RIGHTS AND WARRANTIES AGAINST LATENT DEFECTS. The Cus-

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tomer must notify Electro promptly, but in no event more than four (4) year after the
Product's date of delivery of any claimed breach of this warranty, or such claim shall
be time barred.
3.PRODUCT LIMITED WARRANTY RESTRICTIONS
THE LIMITED WARRANTY CONTAINED HEREIN WILL NOT BE GIVEN OR APPLY, AND
NO EXPRESS OR IMPLIED WARRANTY, INCLUDING BUT NOT LIMITED TO WARRAN-
TIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE NON-INFRINGE-
MENT OF THIRD PARTY RIGHTS AND WARRANTIES AGAINST LATENT DEFECTS SHALL
BE DEEMED APPLICABLE, GIVEN OR PROVIDED BY ELECTRO WITH RESPECT TO OR
CONCERNING THE PRODUCT, IF: (a) the Product has been altered, except by Electro
or Electro's authorized representative; (b) the Product has not been installed, oper-
ated, repaired, or maintained in accordance with instructions supplied by Electro; (c)
the Product has been subjected to abnormal physical or electrical stress, abnormal
environmental conditions, misuse, negligence, or accident; (d) the Product is used in
ultrahazardous activities; or (e) the Customer failed to pay Electro the Product's pur-
chase price pursuant the Terms of Sale published by Electro at https://www.elec-
troind.com/pdf/docs/electro-terms-of-sale.pdf.
4.DISCLAIMER OF WARRANTY AND LIMITATIONS OF LIABILTY
EXCEPT AS EXPRESSLY GIVEN IN THIS LIMITED WARRANTY SECTION, ALL EXPRESS
OR IMPLIED CONDITIONS, REPRESENTATIONS, AND WARRANTIES INCLUDING,
WITHOUT LIMITATION, ANY IMPLIED WARRANTY OR CONDITION OF MERCHANTABIL-
ITY, FITNESS FOR A PARTICULAR PURPOSE, NON- INFRINGEMENT, SATISFACTORY
QUALITY, NON-INTERFERENCE, ACCURACY OF INFORMATIONAL CONTENT, OR ARIS-
ING FROM A COURSE OF DEALING, LAW, USAGE, OR TRADE PRACTICE, ARE HEREBY
EXCLUDED IN THEIR ENTIRETY TO THE FULL EXTENT ALLOWED BY APPLICABLE LAW
AND ARE EXPRESSLY DISCLAIMED BY ELECTRO, AND ARE WAIVED BY THE CUS-
TOMER. TO THE EXTENT AN IMPLIED WARRANTY CANNOT BE EXCLUDED, SUCH WAR-
RANTY IS LIMITED IN DURATION TO THE EXPRESS WARRANTY PERIOD STATED
HEREIN. THIS DISCLAIMER AND EXCLUSION SHALL APPLY EVEN IF THE EXPRESS
LIMITIED WARRANTY SET FORTH ABOVE FAILS OF ITS ESSENTIAL PURPOSE.
EXCEPT AS EXPRESSLY PROVIDED IN THIS SECTION, ELECTRO HEREBY DISCLAIMS
AND CUSTOMER WAIVES ALL REPRESENTATIONS, CONDITIONS AND WARRANTIES
(WHETHER EXPRESS, IMPLIED, OR STATUTORY), INCLUDING, WITHOUT LIMITATION,

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ANY WARRANTY OR CONDITION (A) OF MERCHANTABILITY, FITNESS FOR A PARTICU-
LAR PURPOSE, NONINFRINGEMENT, TITLE, SATISFACTORY QUALITY, QUIET ENJOY-
MENT, ACCURACY, OR SYSTEM INTEGRATION, OR (B) ARISING FROM ANY COURSE
OF DEALING, COURSE OF PERFORMANCE, OR USAGE IN THE INDUSTRY. TO THE
EXTENT AN IMPLIED WARRANTY OR CONDITION CANNOT BE DISCLAIMED, SUCH
WARRANTY OR CONDITION IS LIMITED IN DURATION TO THE APPLICABLE EXPRESS
WARRANTY PERIOD. CUSTOMER SHALL NOT IN ANY EVENT BE ENTITLED TO, AND
ELECTRO SHALL NOT BE LIABLE FOR, INDIRECT, SPECIAL, INCIDENTAL, PUNITATIVE
OR CONSEQUENTIAL DAMAGES OF ANY NATURE INCLUDING, BUT NOT LIMITED TO
AND WITHOUT LIMITATION, BUSINESS INTERRUPTION COSTS, REMOVAL OR REIN-
STALLATION COSTS, REPROCUREMENT COSTS, LOSS OF PROFIT OR REVENUE, LOSS
OF DATA, PROMOTIONAL OR MANUFACTURING EXPENSES, OVERHEAD, INJURY TO
REPUTATION OR LOSS, EVEN IF ELECTRO HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES.
ELECTRO'S LIABILITY TO THE CUSTOMER, AND CUSTOMER'S RECOVERY FROM ELEC-
TRO FOR ANY CLAIM, INCLUDING BUT NOT LIMITATED TO A WARRANTY CLAIM,
SHALL NOT EXCEED CUSTOMER'S PURCHASE PRICE FOR THE PRODUCT PAID BY THE
CUSTOMER FOR THE PRODUCT, WHICH GAVE RISE TO SUCH CLAIM IRRESPECTIVE
OF THE NATURE OF THE CLAIM, WHETHER IN CONTRACT, TORT, WARRANTY OR OTH-
ERWISE. ELECTRO SHALL NOT BE LIABLE FOR, AND THE CUSTOMER SHALL INDEM-
NIFY, DEFEND AND HOLD ELECTRO HARMLESS FROM THE FOLLOWING: ANY CLAIMS
BASED ON ELECTRO'S COMPLIANCE WITH END USER'S OR CUSTOMER'S DESIGNS,
SPECIFICATIONS OR INSTRUCTIONS; MODIFICATION OF ANY PRODUCT BY A PARTY
OTHER THAN ELECTRO; MODIFICATION OF ANY SOFTWARE MADE BY A PARTY OTHER
THAN ELECTRO; THE USE OF THE PRODUCT OR SOFTWARE FOR ANY USE OTHER
THAN ELECTRICAL POWER MONITORING; AUTHORIZED OR UNAUTHORIZED USE OF
THE PRODUCT OR SOFTWARE; MISUSE OF THE PRODUCT OR SOFTWARE; THE SOFT-
WARE'S OR PRODUCT'S USE IN COMBINATION WITH OTHER EQUIPMENT, GOODS,
SOFTWARE OR PRODUCT. IF, FOR ANY REASON, THE FOREGOING LIMITATIONS ARE
FOUND BY AN ARBITRATION PANEL OR COURT OF COMPETENT JURISDICTION TO BE
INVALID OR INAPPLICABLE UNDER ANY APPLICABLE LAW, CUSTOMER AGREES THAT
ELECTRO'S TOTAL LIABILITY FOR ALL DAMAGES, LOSSES, OR CAUSES OF ACTION OF
ANY KIND OR NATURE SHALL BE LIMITED TO CUSTOMER'S PURCHASE PRICE FOR
THE PRODUCT LICENSED BY THE CUSTOMER FROM ELECTRO, WHICH GAVE RISE TO
SUCH CLAIM, WITHOUT REGARD TO ANY ACTUAL DAMAGES; INDIRECT, SPECIAL,

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DIRECT OR CONSEQUENTIAL DAMAGES; PUNITIVE OR EXEMPLARY DAMAGES PRO-
VIDED FOR BY ANY SUCH APPLICABLE LAW.
5.NOTICES
All notices required or permitted under this limited warranty will be in writing and will
be deemed given one (1) day after deposit with a commercial express courier specify-
ing next day delivery (or two (2) days for international courier packages specifying 2-
day delivery), with written verification of receipt. All communications will be sent to
the address set forth below, and notices to Electro shall be further addressed to Attn:
Customer Support.
Electro Industries/Gauge Tech
1800 Shames Drive
Westbury, NY 11590
Attn: Customer Support
Use of Product for Protection
Our products are not to be used for primary over-current protection. Any protection
feature in our products is to be used for alarm or secondary protection only.
Statement of Calibration
Our instruments are inspected and tested in accordance with specifications published
by Electro Industries/GaugeTech. The accuracy and a calibration of our instruments
are traceable to the National Institute of Standards and Technology through equip-
ment that is calibrated at planned intervals by comparison to certified standards. For
optimal performance, EIG recommends that any meter, including those manufactured
by EIG, be verified for accuracy every five years using NIST traceable accuracy stan-
dards. In general, EIG metering devices should not require regular adjustments to
maintain published accuracy. If the meter is to be used for revenue purposes, follow
the verification and calibration guidelines adopted by your local utility.
Disclaimer
The information presented in this publication has been carefully checked for
reliability; however, no responsibility is assumed for inaccuracies. The information
contained in this document is subject to change without notice.

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Safety Symbols
In this manual, this symbol indicates that the operator must refer to
an important WARNING or CAUTION in the operating instructions.
Please see Chapter 11 for important safety information regarding
installation and hookup of the meter.
Dans ce manuel, ce symbole indique que l’opérateur doit se référer à un important
AVERTISSEMENT ou une MISE EN GARDE dans les instructions opérationnelles.
Veuillez consulter le chapitre 4 pour des informations importantes relatives à l’instal-
lation et branchement du compteur.
The following safety symbols may be used on the meter itself:
Les symboles de sécurité suivante peuvent être utilisés sur le compteur même:
This symbol alerts you to the presence of high voltage, which can
cause dangerous electrical shock.
Ce symbole vous indique la présence d’une haute tension qui peut
provoquer une décharge électrique dangereuse.
This symbol indicates the field wiring terminal that must be connected
to earth ground before operating the meter, which protects against
electrical shock in case of a fault condition.
Ce symbole indique que la borne de pose des canalisations in-situ qui doit être
branchée dans la mise à terre avant de faire fonctionner le compteur qui est protégé
contre une décharge électrique ou un état défectueux.

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Our Focus at Electro Industries/GaugeTech (EIG)
EIG exclusively delivers integrated energy and power quality monitoring solutions uti-
lizing AI and deep industry expertise to improve reliability, efficiency, and sustainabil-
ity. With over 50 years' experience in the electrical industry, EIG has developed
extensive energy management and power quality expertise to help customers find
ideal solutions to complex challenges. Our corporate culture promotes being cutting
edge and investing in R&D to continually improve our customer experience.
Our solutions are designed to deliver results in days, not years. Known for our reputa-
tion as being a dependable provider and for exemplary service and support, EIG is
committed to customer satisfaction.

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Table of Contents
Customer Service and Support iii
Product Limited Warranty Certificate iii
Use of Product for Protection vi
Statement of Calibration vi
Disclaimer vi
Safety Symbols vii
Our Focus at Electro Industries/GaugeTech (EIG) viii
1:Three-Phase Power Measurement 1-1
1.1: Three-Phase System Configurations 1-1
1.1.1: Wye Connection 1-1
1.1.2: Delta Connection 1-4
1.1.3: Blondell’s Theorem and Three Phase Measurement 1-6
1.2: Power,Energy and Demand 1-8
1.3: Reactive Energyand Power Factor 1-12
1.4: Harmonic Distortion 1-14
1.5: Power Quality 1-17
2: Meter Overview 2-1
2.1: The Nexus® 1262/1272 Multi-parameter Revenue Meter 2-1
2.2: Accu-MeasureTM Technology - Theory of Operation 2-1
2.3: Advanced Functionality 2-4
2.3.1: Advanced Revenue Billing Capability 2-4
2.3.2: Communications and I/O Capabilities 2-6

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2.3.3: Programmable Display 2-8
2.3.4: Additional Switches 2-8
2.3.6: Optional P40N+, P41N+ and P43N+ LED Remote Displays 2-8
2.4: Nexus® 1262/1272 Meter Forms 2-9
2.5: Nexus® 1262/1272 Meter Accuracy 2-10
2.6: Nexus® 1262/1272 Meter Specifications Overview 2-10
2.7: Nexus® 1262/1272 Meter Logging Specifications 2-15
2.8: DNP3 Level 2 2-15
3: Operating Instructions 3-1
3.1 Nameplate Information 3-1
3.2: Basic Operation 3-4
3.3: LCD Display Information 3-6
3.3.1: Finding Your Display’s Firmware Versions 3-9
3.4: Nexus 1262/1272 Programmable Display Navigation Map 3-10
3.5: Using the Display Configurator 3-11
3.6: Using the Base Programmable Display 3-28
3.6.1: Pre-defined Display Screens 3-30
4: Performing Meter Testing 4-1
4.1: Testing Tools 4-2
4.1.1: Test Pulse LED 4-2
4.1.2: LCD Display 4-3
4.2: Test Mode 4-3
4.2.1: Entering Test Mode 4-4

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4.2.2: Using Test Mode 4-4
4.2.3: Test Mode Preset Accumulators 4-5
4.2.4: Exiting Test Mode 4-9
5: Serial Communication Wiring 5-1
5.1: Communication Overview 5-1
5.2: Communicating to the Meter through the ANSI Type II Optical
Port 5-2
5.3: RS485 Serial Communication 5-4
5.3.1: RS485 Wiring Fundamentals - (Port 1 and Port 4) 5-4
5.3.2: Using the Unicom 2500 5-6
5.3.3: RJ45 Connection—Meter with INP200 (10/100BaseT) Option 5-7
5.3.4: Modem/Ethernet Connection—Meter with INP202 (Combo Card) Option 5-8
5.3.5: RS485 Connection - Meter to the P40N/P40N+/P41N+/P43N+
LED Display 5-8
5.3.6: Communication Ports on the I/O Modules 5-10
5.3.7: RS485 Connection—Meter to I/O Modules 5-10
5.3.8: Steps to Determine Power Needed 5-13
5.3.9: Remote Communication Over Telephone LineCommunicatorPQA®s Using the
RS485 Port 5-14
5.3.10: Programming Modems for Remote Communication 5-15
5.3.11: Selected Modem Strings 5-16
5.3.12: High Speed Inputs Connection 5-16
5.3.13: IRIG-B Connections 5-17
5.3.14: Time Synchronization Alternatives 5-20

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5.4: INP200 Onboard Ethernet 5-21
5.4.1: Hardware Overview 5-21
5.4.2: Hardware Connection 5-21
5.5: INP202 Ethernet/Modem Combination 5-26
5.5.1: Hardware Overview 5-26
5.5.2: Hardware Connection 5-26
5.6: Factory Settings 5-28
6: Hardware Installation 6-1
6.1: Socket Meter Installation 6-1
6.2: Switchboard Meter Installation 6-6
6.2.1: Removing the Meter from the Switchboard Case/Reinstalling
the Meter into the Switchboard Case 6-14
6.3: Internal Battery Installation and Maintenance 6-21
6.3.1: Battery Safety and Disposal 6-23
6.4: Mounting the Optional External Displays 6-23
6.5: Mounting the Nexus® External I/O Modules 6-26
7: Time of Use Function 7-1
7.1: Introduction 7-1
7.2: The Nexus® Meter’s TOU Calendar 7-1
7.3: TOU Frozen and Active Registers 7-2
7.4: Updating, Retrieving and Replacing TOU Calendars 7-2
7.5: Daylight Savings and Demand 7-3
8: Transformer Loss Compensation 8-1
8.1: Introduction 8-1

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8.2: Nexus® 1262/1272 Meter's Transformer Loss Compensation 8-4
8.2.1: Loss Compensation in Three Element Installations 8-5
8.2.1.1: Three-Element Loss Compensation Worksheet 8-6
9: External I/O Modules 9-1
9.1: Hardware Overview 9-1
9.2: I/O Module Installation 9-3
9.2.1: Power Source for I/O Modules 9-3
9.3: Using the PSIO with Multiple I/O Modules 9-4
9.3.1: Steps for Attaching Multiple I/O Modules 9-5
9.4: Factory Settings and Reset Button 9-7
9.5: Analog Transducer Signal Output Modules 9-8
9.5.1: Overview 9-8
9.5.2: Normal Mode 9-9
9.6: Analog Input Modules 9-10
9.6.1: Overview 9-10
9.6.2: Normal Mode 9-11
9.7: Digital Dry Contact Relay Output (Form C) Module 9-12
9.7.1: Overview 9-12
9.7.2: Communication 9-13
9.7.3: Normal Mode 9-13
9.8: Digital Solid State Pulse Output (KYZ) Module 9-14
9.8.1: Overview 9-14
9.8.2: Communication 9-15

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9.8.3: Normal Mode 9-15
9.9: Digital Status Input Module 9-17
9.9.1: Overview 9-17
9.9.2: Communication 9-18
9.9.3: Normal Mode 9-18
10: Electrical Installation 10-1
10.1: Considerations When Installing Meters 10-1
10.1.1: Voltage Fuses 10-4
10.2: Blade Configuration for Forms 9S, 36S, and 45S 10-5
10.3: Socket Meter Wiring Diagrams 10-6
10.4: 9S Meter Mounted in S/A Adapter 10-24
10.5: SWB3 Switchboard Meter Wiring Diagrams 10-25
11: Legacy Switchboard Meter (non-SWB3) 11-1
11.1: Introduction 11-1
11.2: Labels 11-2
11.3: Specifications and Dimensions 11-3
11.4: Installation 11-6
11.5: Wiring Diagrams 11-8
11.6: E137370 Retrofit Panel - S1 to M1 Case Retrofit 11-22
12: Meter Calculations 12-1
12.1: Measurements and Calculations 12-1
12.2: Demand Integrators 12-7

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13: EN 50160/IEC 61000-4-15 Flicker 13-1
13.1: Overview 13-1
13.2: Theory of Operation 13-1
13.2.1: Summary 13-3
13.3: Flicker Setup 13-4
13.4: Flicker Polling Screen 13-5
13.5: Logging 13-9
13.6: Polling through a Communication Port 13-9
13.8: Performance Notes 13-10
A: Transformer Loss Compensation Spreadsheet and Examples A-1
A.1: Calculating Values A-1
A.2: Excel Spreadsheet with Example Numbers A-1
Glossary GL-1

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1: Three-Phase Power Measurement
1:Three-Phase Power Measurement
This introduction to three-phase power and power measurement is intended to
provide only a brief overview of the subject. The professional meter engineer or meter
technician should refer to more advanced documents such as the EEI Handbook for
Electricity Metering and the application standards for more in-depth and technical
coverage of the subject.
1.1: Three-Phase System Configurations
Three-phase power is most commonly used in situations where large amounts of
power will be used because it is a more effective way to transmit the power and
because it provides a smoother delivery of power to the end load. There are two
commonly used connections for three-phase power, a wye connection or a delta
connection. Each connection has several different manifestations in actual use.
When attempting to determine the type of connection in use, it is a good practice to
follow the circuit back to the transformer that is serving the circuit. It is often not
possible to conclusively determine the correct circuit connection simply by counting
the wires in the service or checking voltages. Checking the transformer connection
will provide conclusive evidence of the circuit connection and the relationships
between the phase voltages and ground.
1.1.1: Wye Connection
The wye connection is so called because when you look at the phase relationships and
the winding relationships between the phases it looks like a Y. Figure 1.1 depicts the
winding relationships for a wye-connected service. In a wye service the neutral (or
center point of the wye) is typically grounded. This leads to common voltages of 208/
120 and 480/277 (where the first number represents the phase-to-phase voltage and
the second number represents the phase-to-ground voltage).

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1: Three-Phase Power Measurement
Figure 1.1: Three-phase Wye Winding
The three voltages are separated by 120oelectrically. Under balanced load conditions
the currents are also separated by 120o. However, unbalanced loads and other
conditions can cause the currents to depart from the ideal 120oseparation. Three-
phase voltages and currents are usually represented with a phasor diagram. A phasor
diagram for the typical connected voltages and currents is shown in Figure 1.2.
Figure 1.2: Phasor Diagram Showing Three-phase Voltages and Currents
N
Phase 1
Phase 3
Phase 2
V
C
V
A
V
B
V
A
V
B
V
C
N
I
B
I
A
I
C