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Residential service sizing in Canada follows CEC Rule 8-200, which specifies a demand factor method for calculating the maximum demand on a consumer service. Unlike the NEC, which offers both a standard method (Article 220) and an optional method (NEC 220.82), the CEC provides a single unified demand calculation approach for single-family dwellings.
CEC Rule 8-200 applies a tiered demand factor to the total connected load. The first 10,000 VA of connected load is taken at 100%, and connected load above 10,000 VA uses a 25% demand factor. This is more aggressive than the NEC optional method (which takes the remainder above 10,000 VA at 40%) and typically yields a lower calculated demand for large all-electric homes. The practical effect is that Canadian services are often sized smaller than their NEC equivalents for equivalent-sized homes.
The minimum service size under the CEC is also specified: Rule 8-200 establishes minimum service requirements based on floor area and connected load. Electric heat and air conditioning receive special treatment — electric heat load is included at the demand factor, while air conditioning is added at 100% when it exceeds the electric heat load (only the larger load is used, not both simultaneously).
Canadian EV charger circuits under CEC Rule 8-106 add to the dwelling load calculation. Under CEC 2021 and 2024, the EVEMS (Energy Management System) provision — similar to NEC 625.48 — allows the EVSE load to be managed to a lower demand value when a qualifying energy management system is installed.
SparkShift's dwelling load calculator applies CEC Rule 8-200 demand factors when Canadian mode is selected, notes the 10,000 VA threshold, and formats the output with the Rule 8-200 citation for Ontario, BC, and other provincial permit submissions.
SparkShift pre-selects CEC mode. Results cite CEC rules (8-200) for permit documentation.
Open CEC dwelling load 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 8-200 is the Canadian Electrical Code provision governing demand calculation for single-family dwelling services. It specifies a tiered demand factor: 100% on the first 10,000 VA of connected load and 25% on the remainder, with special treatment for electric heat and air conditioning.
The CEC uses a single demand method (Rule 8-200) compared to the NEC's two methods (standard Article 220 and optional 220.82). The CEC demand factor of 25% on load above 10,000 VA is more aggressive than the NEC optional method's 40%, resulting in lower calculated demands for large homes.
Yes. CEC 2021 and 2024 include provisions under Rule 8-106 that allow EV charger demand to be reduced when a qualifying energy management system is installed, similar to the NEC 625.48 EVEMS provision introduced in NEC 2023.
CEC Rule 8-200 specifies minimum service ampacity based on floor area. For most single-family dwellings, the minimum is 100A (240V). Dwellings with electric heat or large connected loads will require larger services calculated under Rule 8-200 demand factors.
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.