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Commercial electrical service sizing in Canada follows CEC Rule 8-210, which provides demand factors for calculating the maximum demand on commercial and industrial services. The CEC commercial demand calculation differs from NEC Article 220 Part III in both the demand factor structure and the categories of load treated.
CEC Rule 8-210 applies demand factors to commercial lighting and power loads based on the type of occupancy and the total connected load. Lighting loads use a demand factor from CEC Table 14, which varies by occupancy type (office, retail, warehouse, etc.) — similar in concept to NEC Table 220.12 demand factors but with Canadian occupancy categories. General power (receptacle) loads receive a separate demand factor.
For large commercial installations, the CEC also allows a diversity factor to be applied to the total calculated demand when the engineer can demonstrate that not all loads will operate simultaneously. This approach is used on large shopping centres, office towers, and industrial facilities in Canadian practice and is more formally recognized in the CEC than in the NEC (where diversity is addressed through the optional feeder demand factors in NEC 220.80).
Electric heating in Canadian commercial buildings follows CEC Section 62 and receives special treatment in the Rule 8-210 demand calculation because electric heating is so prevalent in Canadian climates. The CEC demand factor for electric heating in commercial buildings recognizes diversity among heating zones and typically allows a 75% demand factor on the total heating load.
Canadian energy codes — the National Energy Code of Canada for Buildings (NECB) and provincial equivalents — impose lighting power density (LPD) limits that interact with the CEC demand calculation by limiting the maximum connected lighting load for the occupancy.
SparkShift pre-selects CEC mode. Results cite CEC rules (8-210) for permit documentation.
Open CEC commercial 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 8-210 provides the demand calculation method for commercial and industrial services. It applies demand factors from Table 14 to lighting and power loads by occupancy type.
CEC Rule 8-210 and Section 62 apply a demand factor to electric heating loads in commercial buildings, typically 75% of the total connected heating load, recognizing that not all heating zones operate simultaneously.
Yes. The CEC formally recognizes diversity factors for large commercial and industrial installations where it can be demonstrated that not all loads will operate simultaneously. This is more explicitly addressed in the CEC than in the NEC.
The National Energy Code of Canada for Buildings (NECB) and provincial equivalents set lighting power density limits that cap the maximum connected lighting load per square metre for each occupancy type. These limits interact with the CEC Rule 8-210 calculation by constraining the connected load input.
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.