the association of electrical and medical imaging equipment manufacturers evse embedded metering...

The Association of Electrical and Medical Imaging Equipment Manufacturers

EVSE Embedded Metering Guide Project

NEMA 5EVSE Submetering WG:

Chairman: Ken BrownProgram Manager: Andrei Moldoveanu

The Association of Electrical andMedical Imaging Equipment Manufacturers


ANSI EVSP 2013 identified the following:

Gap: Standardization of EV sub-meters. Standards for EV sub-meters, including embedded sub-meters, need to be completed to address performance, security/privacy, access, and data aspects.



NEMA EVSE Section: 20 members representing a large part of the market

The Section started a project to address the ANSI EVSP gap

Focus on EVSE embedded meter (EM)



Developing a guide of requirements responding to two major regulatory inputs: For public stations: NIST Handbooks

• 130 Method of sales• 44 Specifications, Tolerances, and

Other Technical Requirements for Weighing and Measuring Devices;

For residential applications:• CPUC Strawman for PEV Submetering Protocol



The WG started listing similar requirements in related codes, standards and regulations. Includes hardware and communications

Identified potential gaps

Evaluated what SDO is best addressing them (SAE, ANSI C12, NEMA, NIST, NEC, UL, etc.).



Results: ANSI C12 can be only partially used.

EVSEs are self contained products with metering functions

Embedded metering required a substantive review of performance definitions and testing procedures.



2 major sections: Commercial EVSE Applications • Commerce

Residential EVSE Applications• Non-commerce



Commercial: Harmonized with NIST & NCWM Assisted with type, permitting and

regular inspection requirements Working towards a self-certification

program to help W&M inspectors



Non-commercial: Harmonized with the SAE

Communication and portions of ANSI C12

Input from the CPUC Optional accuracy levels Proposed field testing similar to

Commerce derived test



Residential NEMA is writing the requirements in the

Guide, then plans get the document approved as an ANSI standard for metrological performance testing with contribution from stakeholders

Using the ANSI standard NEMA intends to create a stringent self-certification program for the metrological performance

the association of electrical and medical imaging equipment manufacturers evse embedded metering...

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