1

First Certificate of Type Approval for Electric 

Vehicle Supply Equipment Issued by the 

California Division of Measurement Standards

Byline: Juana Williams (NIST OWM) and Kristin Macey (CA)

The California (CA) Department of Food and Agriculture Division of 

Measurement Standards (DMS) took an important first step in the recognition of 

Electric Vehicle Supply Equipment (EVSE) for commercial use in the U.S. On 

February 25, 2021, the CA DMS issued the first CA Type Evaluation Program 

(CTEP) Certificate of Approval to the manufacturer of a specific model of EVSE. 

An EVSE is a device or system designed and used specifically to transfer electrical 

energy to an electric vehicle (EV) through either a physical or wireless connection. 

EVSEs have been installed at various locations throughout the U.S. for the public 

to fuel their electric vehicles for a fee. With the issuance of the first type 

evaluation certificate by CA DMS to an EVSE, state and local officials in a number 

of jurisdictions across the country may soon begin routine inspections to ensure 

commercially-used EVSEs are accurate, well-constructed, properly designed and 

installed, and suited for use in commercial transactions. 

Most weights and measures jurisdictions in the U.S. require that commercial 

weighing or measuring devices such as gas pumps, grocery scales, and propane 

metering devices undergo a type evaluation before those devices can be used to 

buy or sell products and services. This includes EVSEs in fueling stations or 

parking lot facilities that are used to buy or sell electrical energy to fuel an EV. A 

certificate is issued to a device manufacturer when a specific model of weighing or 

measuring device has successfully completed rigorous evaluation to determine it 

conforms to a set of design and performance code requirements. This process 

takes place before the device is used commercially in the marketplace.

In 2012, the NIST U.S. National Working Group on Electric Vehicle Fueling and 

Submetering began work on legal metrology standards for EVSE equipment and a 

corresponding method of sale. CA DMS was at the forefront of this work, joining 

this group of experts, comprised of state and local weight and measures officials, 

manufacturers, members of the electrical energy community, federal government 

agencies, and other technical experts to develop what was incorporated into NIST 

Handbooks 44 (EVSE equipment) and 130 (method of sale/signage) in 2015 and 

later into a NIST Examination Procedure Outline (field test procedures). 

April 2021

WEIGHTS & MEASURES

CONNECTION

Volume 11, Issue 2

Office of Weights and 

Measures

General Inquiries:

Barbara D. Cohn

barbara.cohn@nist.gov

(301) 975-4004

Training and Website:

Yvonne A. Branden

yvonne.branden@nist.gov

(301) 975-3272

Publication Inquiries:

Lisa Warfield

lisa.warfield@nist.gov

(301) 975-3308

Newsletter Inquiries:

Douglas A. Olson

douglas.olson@nist.gov

(301) 975-2956

Inside This Issue

First Certificate of Type Approval for 

Electric Vehicle Supply Equipment Issued 

by the California Division of Measurement 

Standards................................................1

Handbook 105-1 Revised! What Now? 

Part II ....................................................3

NIST Handbooks 44, 130, and 133 and 

NCWM Annual Reports.........................4

Calendar of Events.................................5

NIST OWM Staff Directory...................6

(Continued on page 2)
2

First Certificate of Type Approval for EVSE Issued......

(continued from page 1)

CA DMS played a pivotal role in this process, not only bringing to the table its extensive expertise at the county and 

state levels, but also hosting the bulk of the Work Group meetings and championing the adoption of these standards 

across the country. This work serves as a great example of state and federal collaboration with stakeholders working 

together to build the weights and measures infrastructure to support this important alternative fueling application. Except 

for a few types of devices regulated by specific Federal agencies, the regulatory authority for commercial weighing and 

measuring devices rests largely with state and local weights and measures jurisdictions. Most states adopt and enforce 

the provisions of NIST Handbooks 130 and 44 as the requirements for commercial weighing and measuring devices and 

practices in their states. 

The first EVSE to receive CTEP approval met California Code of Regulations (CCR) requirements which are closely 

based on NIST Handbook 44 Section 3.40 Electric Vehicle Fueling Systems – Tentative Code. The CCR EVSE regulation was adopted by CA in 2019 and became effective on January 1, 2020. The CCR permissible errors for the EVSE’s 

delivery of electrical energy to an EV during type evaluation is ± 1.0 percent. Commercial EVSEs installed in California prior to certain installation dates do not have to comply with requirements. California has phase-in enforcement 

dates of:

• January 1, 2021 for all commercial EVSE AC Systems installed on or after January 1, 2021 making those devices fully subject to the regulation on January 1, 2021. 

• All commercial EVSE AC Systems installed prior to January 1, 2021 shall comply with the regulation by January 1, 2031. 

• All commercial EVSE DC Fast Charging Systems installed on or after January 1, 2023 will be fully subject to 

the regulation. 

• All commercial EVSE DC Fast Charging Systems installed prior to January 1, 2023 shall comply with the regulation by January 1, 2033.

The type evaluation process for EVSEs assesses the: (1) accuracy and correctness of the displayed and recorded transaction information when the EVSE is charging an EV or in the event of a power loss; (2) security placed on components 

that can alter measurement results; (3) marking of electrical rating information; (4) method of sale (by the kilowatt-hour) 

for deliveries of electrical energy; (5) charge(s) for other services connected with the fueling process based on time (if an

EVSE has this feature); and (6) the likelihood the device maintains proper operations and settings under conditions of 

typical commercial use. When the U.S. National Type Evaluation Program (NTEP) administered by the National Conference on Weights and Measures (NCWM) begins accepting EVSEs for type evaluation those devices must comply 

with all requirements in NIST Handbook 44 Sections 1.10 General Code and 3.40 Electric Vehicle Fueling Systems –

Tentative Code and, where applicable, Section 5.55 Timing Devices.

With the adoption of requirements for EVSEs and the issuance of type evaluation certificates for these devices, the U.S. 

Weights and Measures community is moving into a new area of legal metrology. Instead of refueling a light duty vehicle with gasoline/diesel the trend is for battery/fuel cell vehicle fueling with alternative fuels such as electricity through 

Retail Electric Vehicle Fueling Systems (aka Electric Vehicle Supply Equipment (EVSE) or Electric Vehicle Chargers). 

State and local authorities have been operating programs set up to verify compliance of traditional fuel dispensers for 

over a century. Electrical energy commercial sales are new to most weights and measures jurisdictions except for California. For decades California county and state officials have routinely verified watthour type electric “submeters” used 

by landlords in apartment buildings, mobile home parks, campgrounds, marinas, and malls to bill tenants for power usage. Electricity metering and its verification has been under the domain of the utility companies and the public service/

utility commissions, except for those “submeter” applications where weights and measures jurisdictions have exercised 

their regulatory authority. Nevertheless, public fueling of vehicles with electricity for a fee is new to the entire country

and continues to grow. Once again California takes the lead on commercial electrical energy applications and there will 

be global benefits because of their actions. All signs point to more type approval certifications of EVSEs to come.

W&M Connection Volume 11, Issue 2
3

NIST Handbook 105-1 Revised! What Now? Part II

Byline: Micheal Hicks and Val Miller

NIST Handbook 105-1, Specifications and Tolerances for Field Standard Weights was published in 2019 by NIST 

OWM and has been implemented across the nation for going on two years. Within the Legal Metrology community, 

there have been some questions and challenges to come up for discussion during this period. The purpose of this article 

is to provide some guidance to the Legal Metrology community regarding these questions and challenges to make all 

aware. The recurring questions and challenges include the following:

• The conformity assessment of Class F Echelon III weights is a challenge to the implementation of the standard. 

NIST Handbook 105-1 (2019) clearly states that no new Class F weights are to be accepted into service after 

January 1, 2020 for legal metrology applications. Only existing, prior to January 1, 2020, Class F field standards may continue to be used provided that they demonstrate mass stability, are properly maintained, and are 

correctly evaluated to the 1990 version of the Handbook 105-1. However, their suitability will still be limited 

to use as field standards for verification of NIST Handbook 44 weighing systems meeting the requirements of 

Classes III, IIIL, and IIII. If a customer purchases new Class F weights from a manufacturer and requests them 

to be calibrated for Legal-for-Trade applications, the Metrologist should reject the work request in accordance 

to NIST Handbook 105-1 (2019). “NIST” Class F no longer exists as part of the 2019 version of Handbook 

105-1. NIST Handbook 105-1 (1990) has been withdrawn and is maintained and available solely as a reference 

document. The above does not apply to customers purchasing new Class F weights for non-Legal-for-Trade 

applications. It will be up to the laboratory and the local policies as to whether the laboratory should provide 

service to a non-Legal-for-Trade customer with new Class F weights. If a laboratory provides service to a customer pursuing non-Legal-for-Trade applications, it is recommended for the following statement (or something 

similar) to be provided VISIBLY on the calibration certificate: “The weights included on this Calibration Certificate, labeled as Class F, do not comply with current regulatory requirements and may not be used within the 

state of ____ for legal calibration and testing of commercial weighing devices.” The calibration of new Class F 

weights will have to be tracked with care to ensure they do not get mixed in with the prior to January 1, 2020 

Class F weights acceptable for commercial Weights and Measures applications. 

• The conformity assessment of ASTM E617 (2018) Class 6 and Class 7 weights is another challenge. These two 

classes have different listed maximum permissible errors (or tolerances) but their material specification is the 

same. The ASTM E617 standard does a poor job of prescribing the material requirements of Class 6 and Class 

7 weight standards. It clearly specifies the material requirements for cylindrical weights less than 100 g and all 

weight types above 5 kg, but it omits requirements for non-cylindrical weights less than 100 g or nominal 

weights between 100 g and 5 kg. Therefore, for these two classes, it permits the manufacturing of small (less 

than 100 g) non-cylindrical weights made of material of lower hardness and/or resistance to corrosion than 

steel. The same goes for weight types between the nominals of 100 g and 5 kg. This is an issue and is not the 

true intent of the standard. OWM will work with the ASTM E41 committee to update the E617 standard to 

have, at minimum, ASTM Class 6 reflect the characteristics of the former Class F weights since Class 6 currently closely resembles the specifications of Class F (i.e., conforming with the 1990 version of Handbook 105-

1 material limitations). 

• In addition, NIST OWM is working to update the ASTM E617 (2018) Class 6 tolerances to match Class F (i.e., 

1990 Handbook 105-1). This is being done due to the current ASTM Class 6 not listing maximum permissible 

error (or tolerance) values for small weight nominals. The currently listed tolerances for ASTM Classes were 

derived from the historical Circular 547 standard of 1954. There are some inconsistencies found in these tolerances where no explanations were recorded nor can be offered by the legal metrology community (e.g., at 

nominals less than 1 oz, ASTM Class 5 tolerances are greater than ASTM Class 6). The proposal is to align the

W&M Connection Volume 11, Issue 2

(Continued on page 4)
4

NIST Handbook 105-1 Revised! What Now? Part II

(continued from page 3)

ASTM Class 6 tolerances closer to those of Class F over the full range and center ASTM Class 5 tolerances 

between the new ASTM Class 6 and current ASTM Class 4 tolerances, to make an approximate 2:1 relationship. The approval vote of these changes is scheduled to go out for ballot after disputes and justification of the 

changes are resolved within the ASTM E41 committee. OWM hopes that the ballot will go out for vote soon. 

ASTM members are encouraged to place their vote once the ballot is released. 

• NIST Handbook 105-1 (1990) directed Metrology laboratories to use lead as a filler/adjustment material for 

Class F weights: 

“6.2. The sealing cap shall be of soft, noncorrosive material so that it can easily be removed when adjusting a 

weight. Lead sealing caps are recommended for weights larger than 5 kg/10 lb. Aluminum is recommended for 

smaller weights. For weights above 50 kg/100 lb the sealing cap shall be at least 1/8 inch thick.”

7.1. Any metal in the form of shot or solid, may be used to adjust weights. Lead is preferred. Molten, poured 

metal is not acceptable. A grit size of 32 or larger is permitted for adjusting material.”

However, the ASTM E617 standard directs laboratories to adjust weights with the same material they are made 

of or with material as stable and of similar density as the base material (see section 5.8.2). Laboratories should 

consider using other filler material than lead or make sure the lead is not oxidizing and gaining weight at a 

quicker rate than the weight being adjusted, as was found to occur with lead of large grit size (i.e., the grit size 

of powder). Larger diameter shot are preferred because of the smaller ratio of surface area to mass that results.

• Laboratory Master Documents, Reference lists, and calibration certificates must correctly reference the documentary standards. All Class F weights in current service must clearly reference the NIST Handbook 105-1 

(1990). New standards will need to reference the 2019 version. As such, both documents will need to be retained on laboratory reference lists. ASTM and OIML classes should reference the applicable title and year of 

publication for those documentary standards as well. It is especially important to note applicable dates of the 

documentary standards because tolerances have changed and as they become more standardized and change 

further, it is important to provide a distinction for all users of the calibration certificates.

Laboratories are reminded to never attempt to reclassify weights as emphasized in Handbook 105-1. This should be left 

for the manufactures to determine due to the complexity of the process. In addition, laboratories should continue to interpolate between nominal masses to determine intermediate tolerances when they are not assigned. For additional questions or concerns, please contact the OWM Laboratory Metrology Program (micheal.hicks@nist.gov).

W&M Connection Volume 11, Issue 2

NIST Handbooks 44, 130, and 133 and NCWM Annual Reports

Byline: Lisa Warfield

The NIST Office of Weights and Measures is not publishing 2021 editions of NIST Handbooks 44, 130, and 133 due to 

the postponement of the 2020 NCWM Annual Meeting. The 2022 versions of the Handbooks are expected to be available in the normal publication cycle at the end of calendar year 2021. These Handbooks are available free of charge from 

NIST at www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/other-nist-handbooks/other-nisthandbooks-2. NCWM members receive hard copies of the NIST Handbooks as part of their membership fee.

The reports of the National Conference on Weights and Measures (NCWM) Annual Reports (1905 to 2019) are available free of charge, in a USB format. Click on “USB Request” link to request a USB that provides you with the 

NCWM Annual Reports. You must provide your name, company affiliation, and mailing address. All requests will be 

fulfilled within two-business days. If you have questions, contact NIST OWM at (301) 975-4004 or owm@nist.gov.
5

Calendar of Events

OWM Training Events

W&M Connection Volume 11, Issue 2

(Continued on page 6)

Date Time

(Eastern Time Zone) Event Name Online orLocation Class

April 14, 2021 11:00 a.m. to 1:00 p.m. NIST Handbook 130 - Examination Procedure 

for Price Verification Online webinar 5731

April 15, 2021 11:00 a.m. to 1:00 p.m. NIST Handbook 130 - Overview of the Uniform 

Packaging and Labeling Regulation Online webinar 5732

April 19, 2021 11:00 a.m. to 1:30 p.m. NIST Handbook 133 - Overview of Handbook 

133 Online webinar 5733

April 22, 2021 11:00 a.m. to 1:30 p.m. Weights and Measures Inspections - Evidence, 

Search and Seizure, and Due Process Online webinar 5734

April 28, 2021 11:00 a.m. to 1:00 p.m. NIST Handbook 133 - How to Test Animal 

Bedding Online webinar 5735

May 3 to 6, 2021 1:00 p.m. to 5:00 p.m. Western Regional Assurance Program (WRAP) Online webinar 5703

May 11 to June 3, 

2021 12:00 p.m. to 4:00 p.m. Fundamentals and LAP Problems Preparation -Summer Online webinar 5730

May 20, 2021 2:00 p.m. to 4:00 p.m. Basic Uncertainty Concepts Online webinar 5710

June 10 and 24, 2021 2:00 p.m. to 4:00 p.m. Software Validation and Verification Online webinar 5709

July 1, 2021 2:00 p.m. to 4:00 p.m. State Laboratory Annual Submission Process Online webinar 5720

August 2 to 5, 2021 1:00 p.m. to 5:00 p.m. Northeastern Measurement Assurance Program 

(NEMAP) Online webinar 5704

August 9 to 13, 2021 8:00 a.m. to 5:30 p.m. Fundamentals of Metrology* Gaithersburg, MD 5725

August 16 to 20, 2021 8:00 a.m. to 5:30 p.m. Fundamentals of Metrology* Gaithersburg, MD 5726

August 30 to September 2, 2021 1:00 p.m. to 5:00 p.m. Southwest Assurance Program (SWAP) Online webinar 5705

September 13 to 17, 

2021 8:00 a.m. to 5:30 p.m. Fundamentals of Metrology* Gaithersburg, MD 5727

September 20 to 30, 

2021 8:00 a.m. to 5:30 p.m. Advanced Mass Seminar* Gaithersburg, MD 5723

October 4 to 7, 2021 1:00 p.m. to 5:00 p.m. MidAmerica Measurement Assurance Program 

(MidMAP) Online webinar 5706

October 18 to 29, 2021 8:00 a.m. to 5:30 p.m. Mass Metrology Seminar* Gaithersburg, MD 5724

*Event scheduled at Gaithersburg, MD. Contingent upon NIST re-opening and allowing visitors on campus.

Shown are OWM training events as of April 1, 2021. Please refer to the OWM website for the most recent listing 

www.nist.gov/pml/weights-and-measures/about-owm/calendar-events.
6

Calendar of Events

Meetings

W&M Connection Volume 11, Issue 2

NIST OWM Staff Directory

Office Headquarters and Administration

Chief Dr. Douglas Olson douglas.olson@nist.gov (301) 975-2956

Office Manager Barbara Cohn barbara.cohn@nist.gov (301) 975-4004

OWM Contacts System, 

Training, Website Yvonne Branden yvonne.branden@nist.gov (301) 975-3272 

Publications Lisa Warfield lisa.warfield@nist.gov (301) 975-3308

Laws, Regulations and Metric Program

Program Leader Kenneth Butcher kenneth.butcher@nist.gov (301) 975-4859

Elizabeth Benham elizabeth.benham@nist.gov (301) 975-3690

David Sefcik david.sefcik@nist.gov (301) 975-4868

Lisa Warfield lisa.warfield@nist.gov (301) 975-3308

Legal Metrology Devices Program

Program Leader Tina Butcher tina.butcher@nist.gov (301) 975-2196

John Barton john.barton@nist.gov (301) 975-4002

Diane Lee diane.lee@nist.gov (301) 975-4405

Juana Williams juana.williams@nist.gov (301) 975-3989

Laboratory Metrology Program

Program Leader Dr. Micheal Hicks micheal.hicks@nist.gov (301) 975-4615

Isabel Chavez isabel.chavez@nist.gov (301) 975-2128

Georgia Harris georgia.harris@nist.gov (301) 975-4004

Val Miller val.miller@nist.gov (301) 975-4004

International Legal Metrology Program

Program Leader Dr. Charles Ehrlich charles.ehrlich@nist.gov (301) 975-4834

Dr. Katya Delak katya.delak@nist.gov (301) 975-2520

Ralph Richter ralph.richter@nist.gov (301) 975-3997

NCWM and Regional Associations

May 10 to 13, 2021 Wisconsin Dells, WI Central Weights and Measures Association (CWMA) www.cwma.net

May 17 to 20, 2021 online Northeastern Weights and Measures Association (NEWMA) www.newma.us

July 18 to 22, 2021 Rochester, NY NCWM Annual Meeting www.ncwm.com

September 26 to 30, 2021 Golden, CO Western Weights and Measures Association (WWMA) westernwma.org

October 10 to 13, 2021 New Orleans, LA Southern Weights and Measures Association (SWMA) www.swma.org

January 9 to 12, 2022 Tampa, FL NCWM Interim Meeting www.ncwm.com

July 10 to 14, 2022 Tacoma, WA NCWM Annual Meeting www.ncwm.com