Testing & Homologation Standard for Electric Vehicle - AC Charger Certification in the US Market
By DIYguru · 1/16/2025 · 11 min read
For an AC charger for Electric Vehicles (EVs) in the US market , manufacturers must comply with federal, state, and industry-specific regulations and standards. These cover safety, interoperability, energy efficiency, environmental sustainability, and grid compatibility. Here is
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<p>For an <strong>AC charger</strong> for <a href="https://emobility.academy/search/" data-type="page" data-id="992936">Electric Vehicles (EVs) </a>in the <strong>US market</strong>, manufacturers must comply with federal, state, and industry-specific regulations and standards. These cover <a href="https://emobility.academy/blog/driving-safety-how-technical-standards-power-the-ev-revolution/">safety, </a>interoperability, energy efficiency, environmental sustainability, and grid compatibility.</p>
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<p>Here is a detailed guide to the testing and homologation requirements:</p>
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<h2 class="wp-block-heading"><strong>Regulatory Framework</strong></h2>
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<figure class="wp-block-image aligncenter"><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXeGL5H0eClhbtDX9RjPsVfE03cyelWPMAEdPo7RIRx2cZKEWmUDEd8EGB8Q8hWtKQwP7NKT1Opt9XVGjhFAmQQw_GdmX9PdgVYj_p1a8DtVVpWlSkxY7Fm3QK4jU7exZvgu_Jt2xg?key=0WANd4kcM8tnA2Z3HCpPDJSV" alt="NEC Requirements for EV Equipment | EC&M"/><figcaption class="wp-element-caption"><strong><a href="https://www.ecmweb.com/national-electrical-code/code-basics/article/21276414/nec-requirements-for-ev-equipment">NEC Article 625</a></strong></figcaption></figure>
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<h3 class="wp-block-heading"><strong>National Electric Code (NEC)</strong></h3>
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<li><strong>NEC Article 625</strong>: Specifies requirements for electric vehicle supply equipment (EVSE):<!-- wp:list -->
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<li>Installation, grounding, and protection against overcurrent.</li>
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<li>Use of listed and labeled equipment.</li>
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<h3 class="wp-block-heading"><strong>Federal Energy Regulatory Commission (FERC)</strong></h3>
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<li>Governs grid-connected chargers and their interaction with the electricity market.</li>
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<h3 class="wp-block-heading"><strong>Environmental Protection Agency (EPA)</strong></h3>
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<li><strong>Energy Star Certification</strong> for energy efficiency (optional but widely adopted for marketability).</li>
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<h3 class="wp-block-heading"><strong>Local Jurisdiction Requirements</strong></h3>
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<li>Adhere to local and state codes for installation and operation.</li>
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<h2 class="wp-block-heading"><strong>Key Standards for AC Chargers</strong></h2>
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<figure class="wp-block-image aligncenter is-resized"><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXe5HZXwe3098r4SdxGdkSf8blAl1guZISFjVVk-UfMq4780_e69GulNFYgk-dSRmsAjWnoh5IOFFHJd9EckVHz4vbVb3LGoBmNyvZ2oufiJQFmNaoUSnb2WwEWROx_iCVhY6e3NqA?key=0WANd4kcM8tnA2Z3HCpPDJSV" alt="" style="width:626px;height:auto"/><figcaption class="wp-element-caption"><a href="https://electricenergyonline.com/energy/magazine/1343/article/The-Bigger-Picture-The-Role-of-Codes-and-Standards-in-Electrifying-the-Transportation-Sector.htm">UL Standards</a></figcaption></figure>
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<h3 class="wp-block-heading"><strong>UL Standards</strong></h3>
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<p>UL (Underwriters Laboratories) certifications are mandatory for EV chargers in the U.S.:</p>
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<li><strong>UL 2202</strong>: Safety for EV charging system equipment.</li>
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<li><strong>UL 2231-1 & UL 2231-2</strong>: Electric shock protection systems.</li>
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<li><strong>UL 2594</strong>: Covers EVSE safety, including construction, performance, and labeling.</li>
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<li><strong>UL 2251</strong>: Safety for plugs, receptacles, and connectors.</li>
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<h3 class="wp-block-heading"><strong>ANSI/NEMA Standards</strong></h3>
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<li><strong>NEMA 250</strong>: Enclosure ratings for environmental protection (e.g., IP rating equivalent).</li>
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<li><strong>NEMA 14-50</strong>: Standard for electrical outlet compatibility with EVSE.</li>
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<h3 class="wp-block-heading"><strong>IEEE Standards</strong></h3>
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<li><strong>IEEE 2030.1.1</strong>: Interoperability for EVSE systems.</li>
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<li><strong>IEEE 1547</strong>: Grid connection of distributed energy resources (DERs), relevant for chargers supporting Vehicle-to-Grid (V2G) or smart charging.</li>
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<p></p>
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<h2 class="wp-block-heading"><strong>Electrical Safety Requirements</strong></h2>
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<li>Chargers must comply with standards to prevent electric shock and fire hazards:<!-- wp:list -->
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<li>Insulation resistance tests.</li>
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<li>Dielectric withstand voltage tests.</li>
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<li>Ground fault protection (Residual Current Device, RCD).</li>
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<li>Overload and short-circuit protection.</li>
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<h2 class="wp-block-heading"><strong>Electromagnetic Compatibility (EMC)</strong></h2>
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<p>Chargers must comply with FCC (Federal Communications Commission) regulations:</p>
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<li><strong>FCC Part 15</strong>: Ensures the charger does not cause harmful radio frequency interference.<!-- wp:list -->
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<li>Conducted and radiated emissions testing.</li>
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<li>Immunity testing to external electromagnetic disturbances.</li>
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<h2 class="wp-block-heading"><strong>Energy Efficiency</strong></h2>
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<p></p>
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<h3 class="wp-block-heading"><strong>Energy Star Certification (Optional but Recommended)</strong></h3>
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<li>Ensures the charger meets high energy efficiency standards.</li>
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<li>Includes standby power consumption limits and active charging efficiency.</li>
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<h3 class="wp-block-heading"><strong>California Energy Commission (CEC) Requirements</strong></h3>
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<li>Chargers sold in California must meet specific energy efficiency and grid responsiveness standards.</li>
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<li>Tested under the <strong>CEC Appliance Efficiency Database</strong>.</li>
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<h2 class="wp-block-heading"><strong>Interoperability and Communication Protocols</strong></h2>
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<figure class="wp-block-image aligncenter is-resized"><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXffzUlHMIx_GfiDwjs9dOk34wvYV1uxbvY-MLEpUrvSWXdJtHjaD-k5_PcDPqj71IvLzCuaTXA5zOLvllEVxpGdL8SAnWBV_xkgqVjpnot3TQZo42KOxPFkq-ohMvGYieb-MIIk?key=0WANd4kcM8tnA2Z3HCpPDJSV" alt="" style="width:658px;height:auto"/><figcaption class="wp-element-caption"><strong>SAE Standard AC Connector</strong></figcaption></figure>
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<h3 class="wp-block-heading"><strong>SAE Standards</strong></h3>
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<li><strong>SAE J1772</strong>: Specifies the standard AC connector and communication protocol for EVSE in North America.</li>
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<li><strong>SAE J2847/1</strong>: Communication between EVSE and onboard chargers.</li>
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<li><strong>SAE J2953</strong>: Interoperability testing for EVSE and EVs.</li>
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<h3 class="wp-block-heading"><strong>Open Charge Point Protocol (OCPP)</strong></h3>
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<li>Supports remote monitoring and smart charging through network integration.</li>
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<li>Common versions: OCPP 1.6 or higher.</li>
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<h2 class="wp-block-heading"><strong>Environmental Testing</strong></h2>
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<h3 class="wp-block-heading"><strong>Ingress Protection (IP Rating)</strong></h3>
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<li>Minimum requirement: <strong>NEMA 3R</strong> or equivalent for outdoor installations (protection against rain, snow, and ice).</li>
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<li>Higher NEMA ratings for harsher environments (e.g., NEMA 4X for corrosion resistance).</li>
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<h3 class="wp-block-heading"><strong>Temperature and Humidity Tests</strong></h3>
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<li>Chargers must operate reliably in U.S. climate extremes:<!-- wp:list -->
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<li>Operating temperature: -22°F to 122°F (-30°C to 50°C).</li>
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<li>Humidity: Up to 95% non-condensing.</li>
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<h3 class="wp-block-heading"><strong>Mechanical Testing</strong></h3>
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<li>Vibration, shock, and impact resistance tests to ensure durability.</li>
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<p></p>
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<h2 class="wp-block-heading"><strong>Cybersecurity and Data Privacy</strong></h2>
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<h3 class="wp-block-heading"><strong>Secure Communication</strong></h3>
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<li>Ensure compliance with cybersecurity standards for connected devices:<!-- wp:list -->
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<li>Use of encryption protocols (TLS, SSL) for data transmission.</li>
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<li>Secure firmware updates.</li>
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<h3 class="wp-block-heading"><strong>Data Privacy</strong></h3>
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<li>Compliance with state-specific data privacy laws (e.g., California Consumer Privacy Act - CCPA) if user data is collected.</li>
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<h2 class="wp-block-heading"><strong>Functional Testing</strong></h2>
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<p></p>
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<h3 class="wp-block-heading"><strong>Charging Performance</strong></h3>
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<li>Verify charging efficiency, power delivery, and compatibility with various EV models.</li>
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<li>Support for single-phase (120V/240V) and three-phase systems if applicable.</li>
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<h3 class="wp-block-heading"><strong>Safety Features</strong></h3>
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<li>Verify overcurrent protection, thermal shutdown, and fault detection mechanisms.</li>
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<li>Ground fault testing to ensure proper operation of protection systems.</li>
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<h2 class="wp-block-heading"><strong>Vehicle-to-Grid (V2G) and Smart Charging</strong></h2>
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<p>For chargers supporting V2G or smart grid integration:</p>
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<li>Compliance with <strong>IEEE 2030.5</strong> and <strong>UL 9741</strong> for bidirectional communication.</li>
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<li>Smart charging functionalities must adhere to utility and grid operator requirements.</li>
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<p></p>
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<h2 class="wp-block-heading"><strong>Labeling and Documentation</strong></h2>
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<h3 class="wp-block-heading"><strong>Labeling Requirements</strong></h3>
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<p>Chargers must display:</p>
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<li><strong>UL mark</strong>: Certification for safety compliance.</li>
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<li>Electrical ratings (input/output voltage and current).</li>
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<li>Environmental rating (e.g., NEMA 3R).</li>
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<li>Manufacturer information.</li>
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<h3 class="wp-block-heading"><strong>Documentation</strong></h3>
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<li>User manual including installation, operation, and safety instructions.</li>
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<li>Declaration of Conformity (DoC) to applicable standards.</li>
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<li>Warranty and service details.</li>
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<h2 class="wp-block-heading"><strong>Certification Process</strong></h2>
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<h3 class="wp-block-heading"><strong>Testing Agencies</strong></h3>
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<p>Testing must be conducted at accredited laboratories recognized by the Nationally Recognized Testing Laboratory (NRTL) program, such as:</p>
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<li>UL</li>
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<li>Intertek (ETL)</li>
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<li>TÜV Rheinland</li>
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<h3 class="wp-block-heading"><strong>Certification Marks</strong></h3>
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<li><strong>UL or ETL Listed Mark</strong>: Mandatory for safety compliance.</li>
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<li><strong>FCC Certification</strong>: Mandatory for EMC compliance.</li>
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<li><strong>Energy Star Label</strong>: Optional but market-preferred for energy-efficient chargers.</li>
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<h2 class="wp-block-heading"><strong>Incentive Eligibility</strong></h2>
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<p>To qualify for federal or state incentives (e.g., rebates, tax credits):</p>
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<li>Chargers must comply with <strong>Energy Star</strong> or equivalent energy efficiency programs.</li>
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<li>Adhere to state-specific requirements (e.g., California's CALeVIP).</li>
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<p>In conclusion, the homologation of EV AC chargers for the U.S. market requires strict adherence to federal, state, and industry standards. Manufacturers must ensure compliance with safety, energy efficiency, interoperability, and environmental requirements while addressing key testing protocols like EMC, cybersecurity, and functional performance. Proper certification through agencies like UL, ETL, and TÜV Rheinland is critical for market entry and consumer trust. Additionally, meeting energy efficiency standards such as Energy Star and state-specific criteria enhances marketability and incentive eligibility. By aligning with these guidelines, manufacturers can successfully navigate the complexities of electric vehicle homologation for AC chargers.</p>
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<h3 class="wp-block-heading"><strong>Q1: What are the US Vehicle standards?</strong></h3>
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<p>US vehicle standards, regulated by NHTSA and EPA, include FMVSS for safety, CAFE for fuel efficiency, and emissions rules under the Clean Air Act.</p>
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<h3 class="wp-block-heading"><strong>Q2: What is the <a href="https://www.tuvsud.com/en-in/industries/mobility-and-automotive/automotive-and-oem/homologation-and-global-market-access/fmvss-testing-and-vehicle-compliance-services">US Vehicle Safety Act</a>?</strong></h3>
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<p>The Vehicle Safety Act ensures vehicles meet safety standards to reduce accidents and injuries through FMVSS compliance.</p>
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<h3 class="wp-block-heading"><strong>Q3: What is vehicle homologation in the USA?</strong></h3>
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<p>Vehicle homologation is the process of testing and certifying vehicles to meet U.S. safety, emissions, and performance regulations.</p>
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<h3 class="wp-block-heading"><strong>Q4: What are the U.S. testing and homologation requirements?</strong></h3>
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<p>Manufacturers must comply with FMVSS, EPA emissions rules, CAFE standards, and provide proper documentation and labeling. Testing must be done at accredited facilities.</p>
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