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Updated June 2026- 1.What is an electrical service load?
- 2.CEC Rule 8-200 — demand method
- 3.Understanding demand factors
- 4.Worked examples
- 5.100A vs 200A vs 400A service
- 6.200-amp service upgrade cost in Canada
- 7.Electrical permit requirements by province
- 8.Frequently asked questions
- 9.CEC Part 1 vs Part 2 — which applies?
- 10.Code reference
Full formula and methodology: How this calculator works →
What is an electrical service load?
The electrical service load is the total calculated demand that a home places on the electrical utility supply. It determines the minimum size of the main service panel — 100A, 200A, or 400A. Size it too small and the main breaker trips during peak usage. Size it correctly and the panel has capacity for present and future loads.
In Canada, the electrical service load is calculated per the Canadian Electrical Code (CEC). The CEC uses a demand-based method — you do not simply add up the nameplate ratings of every appliance. Demand factors reduce the calculated load because not everything in a home runs simultaneously at full power.
CEC Rule 8-200 — the demand method
The CEC Rule 8-200 residential load calculation follows this sequence:
- Basic load (Rule 8-202): 5,000 VA for the first 90 m² of heated floor area, plus 1,000 VA for each additional 90 m² or fraction thereof
- Small appliance circuits (Rule 8-204): 1,500 VA per circuit, minimum 2 circuits (kitchen small appliance circuits)
- Combined demand factor: First 3,000 VA at 100%; remainder at 35%
- Fixed appliances: 100% of nameplate — dishwasher, garburator, freezer, etc.
- Electric range (Rule 8-208): Table 14 demand — 8 kW for ranges up to 12 kW nameplate
- Dryer (Rule 8-210): 5,000 VA or nameplate, whichever is greater
- Heating vs cooling: Use the larger of the two at 100% — never add both
Final service size = Total VA ÷ 240V, rounded up to the next standard service size.
Understanding demand factors
Demand factors exist because electrical diversity in a home is predictable. At any given moment, not every outlet is loaded, not every light is on, and not every appliance runs simultaneously. The CEC formalizes this reality into factors that reduce the paper load to a realistic peak demand.
The most significant demand factor is the 35% factor applied to general loads above 3,000 VA. This reflects that a home with 20 circuits and 40 outlets will never draw full current on all of them at once. Without this factor, a modest home would appear to need a much larger service than it actually requires.
Heating and cooling loads are treated differently — they are large, predictable, and run for sustained periods. The CEC requires the larger of heating or cooling at 100% — you never add both, since a home is not heating and cooling simultaneously.
Worked examples
Example 1 — 100 m² gas-heated home (Quebec):
- Basic load: 5,000 VA (under 90 m² threshold, but 100 m² is close — use 5,000 + 1,000 = 6,000 VA)
- Small appliance circuits (2): 3,000 VA
- Combined: 3,000 × 1.0 + 6,000 × 0.35 = 5,100 VA
- Gas range and dryer: no electric load
- Total: 5,100 VA ÷ 240V = 21.3A → 100A service adequate
Example 2 — 150 m² fully electric home (Ontario):
- Basic load: 5,000 + 1,000 = 6,000 VA
- Small appliance circuits (2): 3,000 VA
- Combined demand: 3,000 × 1.0 + 6,000 × 0.35 = 5,100 VA
- Electric dryer: 5,000 VA
- Electric range (10 kW): 8,000 VA demand
- Electric water heater (4,500W): 4,500 VA
- Electric heating (12,000W): 12,000 VA
- Total: 34,600 VA ÷ 240V = 144A → 200A service required
100A vs 200A vs 400A service
| Service Size | Capacity (VA) | Typical Application |
|---|---|---|
| 100A | 24,000 VA | Small home, gas heat and appliances, no EV charger |
| 200A | 48,000 VA | Most Canadian homes — electric appliances, 1 EV charger |
| 400A | 96,000 VA | Large homes, electric heat, multiple EV chargers, workshops |
200-amp service upgrade cost in Canada
A 200-amp service upgrade is one of the most common electrical projects in Canadian homes built before 1980. As electric vehicles, heat pumps, and high-efficiency appliances become standard, many homes find their 100-amp panels at or near capacity. The upgrade replaces the meter base, main service cable, and panel with equipment rated for 200A.
| Province / City | Typical Cost Range | Notes |
|---|---|---|
| Ontario (Toronto) | $2,500–$4,000 | Hydro One / Toronto Hydro reconnect included |
| Ontario (smaller cities) | $2,000–$3,500 | London, Hamilton, Ottawa, Kingston |
| British Columbia | $3,000–$5,000 | BC Hydro coordination required; higher labour rates in Metro Vancouver |
| Alberta (Calgary) | $2,500–$4,500 | ATCO/Enmax reconnect; permit through City of Calgary required |
| Alberta (Edmonton) | $2,000–$4,000 | EPCOR reconnect; City of Edmonton permit required |
| Quebec | $2,500–$4,000 | Hydro-Québec coordination; permit from municipality |
| Prairies (Winnipeg, Saskatoon) | $2,000–$3,500 | Generally lower labour costs; permit required |
These costs cover a straightforward upgrade where the panel and meter are accessible and no rewiring of branch circuits is needed. The new service entrance cable is typically 2/0 or 3/0 AWG aluminum — use the wire size calculator to verify the feeder conductor size for your specific service. Additional work such as panel relocation, asbestos abatement in older walls, or replacing knob-and-tube wiring will increase the cost significantly. Always get at least two quotes from licensed electricians and confirm that a permit will be pulled.
In most provinces, a 200-amp upgrade also requires a utility company disconnection and reconnection — your electrician coordinates this as part of the job. In Ontario, contact Hydro One or Toronto Hydro — they typically respond within 1–5 business days for a planned reconnect. In BC, the reconnect is coordinated through BC Hydro. In Alberta, contact Enmax (Calgary) or EPCOR (Edmonton). In Quebec, Hydro-Québec handles all residential reconnects.
Electrical permit requirements by province
A permit is required for electrical service upgrades in every Canadian province. The process, fees, and inspection authority vary significantly:
| Province | Electrical Authority | Typical Permit Cost | Notes |
|---|---|---|---|
| Ontario | Electrical Safety Authority (ESA) | $200–$500 | ESA issues Certificate of Inspection after passing; utility reconnects after |
| British Columbia | Technical Safety BC | $150–$400 | BC Hydro / FortisBC coordinate meter reconnection after inspection |
| Alberta | Safety Codes Council / AHJ | $150–$350 | ATCO or Enmax reconnect after municipality inspection sign-off |
| Quebec | Régie du bâtiment (RBQ) | $100–$300 | Hydro-Québec requires RBQ permit confirmation before reconnection |
| Saskatchewan | TSASK | $100–$250 | SaskPower reconnects after inspection |
| Manitoba | Office of the Fire Commissioner | $100–$250 | Manitoba Hydro reconnects after inspection |
| Nova Scotia | Technical Safety Division | $100–$200 | Nova Scotia Power reconnects after passing |
| New Brunswick | NB Electrical Inspection | $100–$200 | NB Power reconnects after inspection |
In all provinces, service upgrades must be performed by a licensed electrical contractor (master electrician). Ontario is an exception: a registered homeowner may perform their own electrical work under a homeowner permit — contact ESA for eligibility. Unpermitted service upgrades create liability, can void home insurance, and will appear on a property inspection when you sell.
Frequently asked questions
How much does it cost to upgrade to 200-amp service in Canada?
Do I need a 100-amp or 200-amp service in Canada?
How do I upgrade from 100-amp to 200-amp service in Canada?
Can I add an EV charger to my existing 200-amp panel?
Why doesn't the CEC add up all loads directly?
What is the minimum service size for a new home in Canada?
Does electric heating require a larger service panel?
How is an electric range calculated in the CEC load method?
When do I need 400-amp service in Canada?
CEC Part 1 vs Part 2 — which applies to your building?
The Canadian Electrical Code (CEC C22.1) is divided into two parts with different load calculation methods:
| CEC Section | Applies to | Load calculation method |
|---|---|---|
| Part 2 — Rules 8-200 to 8-210 | Residential (single dwellings, duplex, row housing) | Demand method — this calculator |
| Part 1 — Rule 8-106 | Commercial, industrial, multi-unit residential (apartments), institutional | Connected load with demand factors — requires licensed electrical engineer |
This calculator covers CEC Part 2 (residential) only. If you are calculating the service for an apartment building, office, retail space, warehouse, or any building with a commercial occupancy, you need a CEC Part 1 load calculation performed by a licensed electrical engineer or master electrician. Part 1 accounts for connected load diversity, motor starting currents, and occupancy-specific demand factors that differ substantially from the residential demand method.
For residential buildings with more than two units on a single service, the calculation transitions from Part 2 to Part 1 methodology. A licensed electrician or engineer should confirm which rules apply for your specific project before permit submission.
Code reference
This calculator follows CEC Rule 8-200 (dwelling unit service load), Rule 8-202 (basic load), Rule 8-204 (small appliance load), Rule 8-208 and Table 14 (electric ranges), and Rule 8-210 (electric dryers). Based on CSA C22.1-21.