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Electric vehicle charging in Canada is governed by CEC Rule 8-106, which addresses EVSE (Electric Vehicle Supply Equipment) circuit sizing and service demand calculation. The CEC 2021 and 2024 editions have significantly updated the EV charging requirements to address the rapid growth of EV adoption in Canada, with provisions closely paralleling NEC 625.42 and the EVEMS rules of NEC 625.48.
CEC Rule 8-106 requires that EVSE branch circuits be sized at 125% of the maximum EVSE output current — the same continuous load factor as the NEC. A 40A Level 2 EVSE requires a 50A branch circuit with a 50A OCPD (or a 40A OCPD on a 100% rated breaker). This is identical to NEC 625.42 requirements.
The CEC EVEMS (Energy Management System) provision allows the EVSE demand contribution to the service load calculation to be reduced when a qualifying energy management system is installed. Under CEC 2021, the EVEMS can reduce the EVSE contribution to the Rule 8-200 dwelling service calculation by limiting the actual maximum power draw of the EVSE during peak demand periods. This is the Canadian equivalent of NEC 625.48 EVEMS provisions added to the NEC 2023 edition.
Canada has additional context for EVSE sizing: British Columbia's CleanBC initiative and Ontario's Green Economy requirements create provincial incentives for EVSE-ready installations even when no charger is immediately installed. These provincial programs may require EVSE-ready conduit and circuit capacity calculations even for new construction without immediate EVSE installation — a requirement that goes beyond the base CEC provisions and requires coordination with the applicable provincial building code.
Multi-family and commercial EVSE installations in Canada fall under CEC Rule 8-106 as well, with specific provisions for shared EVSE systems and load management in parking facilities.
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Open CEC ev charger calculator →Each Canadian province and territory has adopted a version of the CEC. Verify the adopted edition and local amendments with your AHJ.
CEC Rule 8-106 governs EVSE branch circuit sizing, service load demand calculation for EV chargers, and EVEMS provisions in Canada. The branch circuit must be sized at 125% of the EVSE maximum output current, the same as NEC 625.42.
Yes. CEC 2021 and 2024 include EVEMS provisions in Rule 8-106 that allow the EV charger demand contribution to the dwelling service load calculation to be reduced when a qualifying energy management system is installed. This parallels NEC 625.48.
Yes. British Columbia (CleanBC program) and Ontario (Green Economy requirements) have provincial initiatives that may require EVSE-ready conduit and circuit capacity in new construction beyond what the base CEC mandates. Check with the applicable provincial authority.
Under CEC Rule 8-106, a 40A EVSE requires a branch circuit rated at 125% of 40A = 50A. Use a 50A OCPD and 6 AWG copper conductors rated for 55A or more (from CEC Table 2). Verify voltage drop under Rule 8-102 for longer runs.
Disclaimer: SparkShift calculators are provided for informational purposes. Always verify calculations against the adopted CEC edition in your province and confirm requirements with your local authority having jurisdiction (AHJ) before commencing work. The CEC edition adopted may differ by province — Ontario uses the OESC, BC uses the BC Electrical Safety Regulation, and other provinces have their own adopted editions.