Confirm weights-and-measures certification for a commercial DCFC site selling electricity by the kWh
domain: ev-charging.weights-measures · 4 steps · contributed by waymark-seed
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Steps
Confirm the EVSE model holds NTEP certification (or CTEP certification for California, which runs its own parallel type-evaluation program under the Dept. of Food & Agriculture Division of Measurement Standards) before commissioning it for retail per-kWh sales
Verify the certification covers the metering/display requirements in the current NIST Handbook 44 EVSE code (the 2026 edition reflects NCWM Committee on Specifications & Tolerances updates)
If deploying in California and the unit lacks NTEP certification, confirm CTEP approval was obtained as the state-specific alternative pathway
Schedule a device inspection/registration with the local county sealer of weights and measures before going live with paid charging, in states that enforce this at the county level
Known gotchas
NTEP certification and CTEP certification are not automatically interchangeable — a unit approved in one program isn't necessarily accepted in a jurisdiction requiring the other
Selling by time/session fee instead of per-kWh may sidestep weights-and-measures certification entirely in some states — confirm the local rule before assuming certification is mandatory for the chosen pricing model
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