This document provides a summary of NEMA/ANSI standards for electricity metering. It begins with background on international organizations that set metrology standards, including the Treaty of the Meter signed in 1875. It then discusses the roles of ANSI and NEMA in accrediting standards committees in the US. The bulk of the document outlines recent updates from spring 2017 meetings, including draft standards on VAR/VARh measurement, auxiliary device influence testing, and field testing procedures. It concludes with an invitation to contact the presenter with any other questions.

1. 1
10/02/2012 Slide 1
NEMA/ANSI Standards:
Background,Updates, and
Discussion
Prepared by Rob Reese,TESCO
for
Midwest Energy Association
ELECTRIC OPERATIONS
TECHNICAL & LEADERSHIP SUMMIT
Springfield, IL
May 12, 2017

2. 2
Agenda
•Background, History, and Overview
•Updates from Spring 2017 Meetings
•Roundtable:
-Questions
-Discussion

3. 3
Background, History, and Overview
Treaty of the Meter
Convention du Mètre – Paris
Metre Convention
May 20, 1875
17 Nation Signees, including the US
The treaty set up an institute for the purpose of coordinating
international metrology and for coordinating the development of the
metric system.
Initially it was only concerned with the units of mass and length but, in
1921, at the 6th meeting of the General Conference on Weights and
Measures (CGPM), it was revised and its mandate extended to cover
all physical measurements. -Wikipeadia

4. 4
Background, History, and Overview
Treaty of the Meter
The treaty also set up associated organizations to oversee the running
of the institute.
The CGPM (Conférence générale des poids et mesures) – a meeting
every four to six years of delegates from all member states.
The International Committee for Weights and Measures (Comité
international des poids et mesures or CIPM) – an advisory body to the
CGPM consisting of 18 prominent metrologists from 18 different
countries.
The International Bureau of Weights and Measures (Bureau
international des poids et mesures or BIPM) – an organisation based
at Sèvres, France that has custody of the International Prototype
Kilogram, provides metrology services for the GCPM and CIPM,
houses the secretariat for these organisations and hosts their formal
meetings. - Wikipeadia

5. 5
Background, History, and Overview
Treaty of the Meter
International Organization of Legal Metrology
Organisation Internationale de Métrologie Légale - OIML
Paris, 1955
Promotes the global harmonization of the legal metrology procedures
that underpin and facilitate international trade.
OIML R46 – International Standard for Electric Meters
- Wikipeadia

6. 6
Background, History, and Overview
Treaty of the Meter
Therefore, the US has an obligation, as one of the
treaty signees, to adhere to the provisions set
forth in the treaty and OIML R46 Standard.

7. 7
Background, History, and Overview
ANSI
(American National Standards Institute)
-Open to All Interested Parties
And
NEMA
(National Electrical Manufacturers Association)
-Meter and Equipment Manufacturers Only
-Membership Dues are Assessed
-8-EI-1 - Meter Manufacturers
-8-EI-3 - Sockets and Test Equipment Manufacturers

8. 8
Background, History, and Overview
Both serve to provide accreditation to the
various standards committees (or bodies)
Separate and independent until the
late 80’s/early 90’s
NEMA purchased ANSI
Allows ANSI to run largely independent

9. 9
Background, History, and Overview
New Standards:
The Standards Development Process
1. Project initiation
2. Developing the draft
3. Balloting (gathering comments)
4. Codes and Standards Committee
approval
5. Editing and publication
Reference: http://www.nema.org/Standards/About-Standards/Pages/How-NEMA-Standards-Are-Developed.aspx

10. 10
Background, History, and Overview
Standards Maintenance
Committees must re-affirm, update, or
withdraw all current standards every five
years (2 year extension available)

11. 11
Background, History, and Overview
Standards Maintenance
ANSI C12 Standards Status – April 2017
Designation
Final Action
Date Title
Responsible
Subcommittee
Responsible
NEMA
Section
Project Action
ANSI C12.1-2014 6/27/2008 Electricity Metering, Code for SC 1 8EI - 1TC Published 3-30-16
ANSI C12.4-1984 (R2002,
R2011)
5/19/2011 Registers, Mechanical Demand SC 1 8EI – 1TC Reaffirmed. Published Jan. 6, 2012
*Reaffirm or Revise?
ANSI C12.5-1978 (R2002) 5/19/2011 Meters, Thermal Demand SC 1 8EI –1TC Reaffirmed. Published Oct. 25,
2012
*Reaffirm or Revise?
ANSI C12.6-1987 (R2016) 01/12/17 Phase-Shifting Devices Used in
Metering, Marking and Arrangement of
Terminals for
SC 15 8EI – 3TC Last Published 9-26-2012
Voted to Reaffirm at c12 main
4/2016
Pins submitted 5/27/16
BSR 8 filed
BSR9 submitted 1/11/17
ANSI Approval 01/12/17
Reaffirm. In Publication needs re-
typing
ANSI C12.7-2005 (R2014) 8/14/14 Requirements for Watthour Meter
Sockets
SC 15 8EI – 3TC Approved August 14, 2014
Published Feb. 23, 2015
ANSI C12.8-1981 (R2012) 5/19/2011 Watthour Meters, Test Blocks and
Cabinets for Installation of Self-
Contained “A” Base
SC 15 8EI – 3TC Published Dec. 18, 2012
*Reaffirm or Revise? 2 – year BSR-
11 Extension request submitted to
ANSI

12. 12
Background, History, and Overview
“Org Chart”
NEMA
ANSI
ASC ASC ASC ASC
SUB-COMMITTEE WORKING GROUP
IEEE SINGLE COMPANY
ACCREDITED STANDARDS COMMITTEES
(ACTUALLY CREATES AND MAINTAINS THE STANDARDS)
EXAMPLE: ANSI C12
SUPPORTS THEIR
MEMBER MANUFACTURERS
SETS THE RULES
-PROCEDURES, DECORUM, ETC.

13. 13
Background, History, and Overview
Who does all this?
1.Users
(Utilities)
2. Manufacturers
(Meter Manufacturers, Equipment Manufacturers, etc.)
3. Interested Parties
(Educational, Legislative, etc.)

14. 14
Background, History, and Overview
Standards are actually created at the sub-
committee level:
ANSI C12.1 Code for Electricity Metering SC1
ANSI C12.7 Requirements for Watthour Meter Sockets SC15
ANSI C12.20 0.2 and 0.5 Accuracy Class SC16
ANSI C12.29 Field Testing of Metering Sites SC29
(placeholder)

15. 15
Background, History, and Overview
•Meet twice a year (Spring and Fall)
•In conjunction with the Edison Electrical
Institute (EEI) Conference
Paul Orr
Program Manager, NEMA Industry Operations
National Electrical
Manufacturers Association
1300 North 17th
Street, Suite 900
Rosslyn, VA 22209
(703) 841-3227
Pau_Orr@nema.org

16. 16
Background, History, and Overview
Next Meeting:
October 2-5, 2017
Houston, TX
www.eei.org

17. 17
Updates – Spring 2017
Agenda:
ANSI C12-SC24 VAR/VARh
Aux. Device Influence WG
Field Testing of Metering Sites
Demand Type Test WG
VA Working Group
ANSI C12 SC15
ANSI C12 SC1
ANSI C12 SC16
ANSI Main

18. 18
Updates – Spring 2017
VAR / VARh SC
Working Group is currently working on a draft
document to define how to calculate and measure
VAR and VARh. Document is in its early stages.

19. 19
Updates – Spring 2017
Aux. Device Influence WG
Working Group is currently working on a draft document to
define and test the effects of auxiliary devices to the
accuracy and performance of the meter. The committee
agreed that the scope should only include wireless
communication devices, with PLC devices be added in the
future. The committee is also deciding if the standard should
be based on the communication device being on or off (i.e.
Will the standard test the influence of the communications
module on the meter, or the performance of the meter when
the communications module is active?)

20. 20
Updates – Spring 2017
C12 SC15 Test Switches and Sockets
No additional information on the proposed instrument transformer
barcode system, similar to the “standardized” barcodes for meters.
It was announced that the new meter forms, including the auxiliary power
input pin, were approved.
A review of ANSI C12.8 “Test Blocks and Cabinets for Installation of
Self-Contained “A” Base Watthour Meters.” was conducted, and it was
deemed that very little remains relevant to the industry now. However, it
was noted that Figure 4, in the document, is still relevant and used in
EUSERC approved applications. A motion to take figure 4 and move into
C12.7 was made and unanimously approved. The rest of C12.8 be
withdrawn sometime after C12.7 is updated.

21. 21
Updates – Spring 2017
Field Testing of Metering Sites
Draft allows for testing with a) Customer potential and current, b)
Customer potential and generated current, and c) Generated Potential
and current.
Main conceptual idea: If a technician executes a meter test in the field, in
a great majority of cases, the meter will pass the test, and no further
analysis is necessary. However, if the meter “fails”, then the technician
will need to execute additional analysis to ascertain if the meter is being
used within the manufacturer’s specified operating range and the test
was executed within the specified bounds.
Committee agreed to create a WG to draft a paragraph to direct the field
technician as to what additional information/measurements are required
for further analysis.

22. 22
Updates – Spring 2017
C12 SC16
It was announced that ANSI C12-20 will go out to public review soon, and
will be officially approved and published by March 2017 (update – end of
April)
5.5.2 Loading for accuracy tests
Unless otherwise specified, accuracy tests may be done with either series-parallel loading or polyphase
loading; however, polyphase loading is recommended for all multi-element meters. For series-parallel
loading, the meter shall be tested with the voltage circuit(s) effectively in parallel and with the appropriate
current circuit(s) effectively in series. For polyphase loading, the meter shall be tested with voltage and
current phase angles similar to actual service installations as described (polyphase loading) in Table 3.
Polyphase loading will be mandatory for testing of polyphase meters effective January 1, 2020.
When polyphase loading is used, the appropriate loading will depend on the meter configuration (meter
Form). Accuracy tests done with polyphase loading shall pass for Typical Loading configurations as
shown in Table 3. If the meter is certified for use with an alternate loading configuration, then for those
tests designated in the last column of Table 6, testing shall be performed using all Alternate Loading
configuration(s) particular to the type description shown in Table 3. The internal meter connections for
these Forms Designations are provided in ANSI C12.10.

23. 23
Updates – Fall 2016
C12 Main
Reports of Sub-committees
C12-20 by the end of April

24. 24
Roundtable
•Questions?
•Discussion?

25. 25
Thank you!
Please feel free to call or e-mail any questions
Rob Reese
Rob.Reese@TescoMetering.com 215-310-8809 (cell)
The Eastern Specialty Company