New California DMS Rules for EV Charging Stations

New California DMS Rules for EV Charging Stations

California’s Administrative Law Office and the Division of Measurement Standards (DMS) approved the amended Electric Vehicle Fueling Systems Specifications on December 16, 2019. These rules govern the measurement and tolerance of charging systems used for charging electric vehicles, technically known as electric vehicle supply equipment (EVSE). This amendment is seen as a big blow to firms presently operating on per-minute billing.  With this change,  EV stations will be more like gasoline stations, allowing EV owners to see the rate, quantity, and price on a real-time basis.

NEW DMS RULES for EVSE in California

  1. EVSEs to have safety certification by a nationally recognized testing laboratory (NRTL).
  2. The unit of measurement of electricity to be kilowatt-hour (kWh) or mega-joule (MJ).
  3. The EVSE should be able to measure and display the smallest unit of delivery. This unit should be less than or up to 0.0005 MJ or 0.0001 kWh.
  4. The EVSE should have an easy-to-read user display, which needs to show the unit price in whole cents, set for dispensing the electricity. If the electricity is Unlimited, then it should be displayed explicitly. The display should also show the maximum rate of energy transfer and the current associated with it (for example, 20 kW DC or 7 kW AC).
  5. The EVSE needs to automatically show the quantity delivered at any point in time, along with the initial zero condition.
  6. The EVSE should be able to accurately measure the units and dispensing rate in the temperature range of -40 °C to + 85 °C. If any component is not capable of measuring in this entire range, it needs to be mentioned in the safety certificate from the NRTL. Also, this needs to be clearly marked on the EVSE.


AC fast chargers ( L2 category)

  1. All new Level 2 AC chargers installed on and after 1-Jan-2021 need to be compliant at the time of installation
  2. All old (current) L2 AC chargers installed before 1-Jan-2020, need to comply by 1-Jan 2031. Meaning they can charge by the minute up-to Dec 2030

DC Fast Chargers

  1. All new DC fast chargers installed on or after 1-Jan-2023 need to be compliant at the time of installation.
  2. All DC  installed before 1-Jan-2023 need to be in compliance by 2033.

The New California DMS Rules for EV Charging Stations only apply to charging stations available to the public. Charging stations installed at residences or workplaces do not fall within the scope of this rule. Additionally, the new rule exempts stations operated by public entities and municipalities. Finally, it does not include stations that sell free electricity as motor vehicle fuel to consumers.

50% of California’s cars run on green energy. Through these new DMS rules for EV charging stations, the state is working to build confidence among EV owners. Many industry experts, along with EV drivers, considered the per-minute billing unfair. EV charging depends on a number of factors: the vehicle’s maximum intake capacity, the initial charge on the battery (a battery that is 80% charged takes longer to charge), and external temperature conditions. The new rules favor EV drivers.  By offering full transparency at the charging station, the state is creating the best charging experience on the go.