The charger's rated output, not the breaker.
From the service load calculator, or ask your electrician.
Breaker
40A
Copper wire (60 C column)
8AWG Cu
Charger power at 240 V
7.7kW
An EV charger is a continuous load, so the circuit is sized at 125% of the charger's rating: 32 A x 1.25 = 40.0 A, rounded up to a 40 A breaker. 8 AWG copper is rated 40 A in the 60 C column.
On these numbers the service has about 200 A spare, enough for a 32 A charger.
Planning estimate for copper conductors. Cable type, insulation temperature rating, conduit, long runs (voltage drop), terminal ratings and aluminum conductors change the answer. A licensed electrician and a permit are required for the installation.
A home EV charger runs for hours, so the Code treats it as a continuous load and the circuit has to be sized with margin. Choose the charger's rated amps and this tool shows the breaker size, the copper wire size and the power at 240 volts. Add your service size and what the house already uses and it also tells you whether the charger fits, or what charger setting would fit if an EV energy management system limits it.
For permits, rebates and typical project steps, read whether you need a panel upgrade for an EV charger and the guide to the BC Hydro EV charger rebate.
How the numbers are worked out
- Breaker: the charger's rated amps x 1.25 (continuous load), rounded up to the next standard breaker size. A 32 A charger needs a 40 A breaker, a 40 A charger a 50 A breaker, a 48 A charger a 60 A breaker.
- Wire: the smallest copper conductor whose allowable ampacity in the 60 C column of Canadian Electrical Code Table 2 is at least the breaker size. The 60 C column is the cautious choice for circuits up to 100 A.
- Power: rated amps x 240 V.
- Room on the service: your service size minus the house demand you enter. The charger fits if its rated amps are no more than that spare capacity. If it does not, the tool names the largest common charger setting (16, 24, 32, 40 or 48 A) that would fit.
What this tool does not cover
This tool does not account for the type of cable or conduit, wiring in hot or bundled locations, voltage drop on long runs, aluminum conductors, or terminals rated differently from the wire. It does not replace the load calculation your electrician runs for the whole house. EV energy management systems must meet the Code and be approved for use; ask your electrician. Installing a charger needs an electrical permit and, under Technical Safety BC's guidance, a licensed contractor.
Frequently asked questions
What breaker do I need for a 40 amp EV charger?
A 50 amp breaker, because the charger is a continuous load and the circuit is sized at 125% of 40 A.
Do I need a panel upgrade for an EV charger?
Not always. If the service has spare capacity for the charger, you do not. If it does not, load management or a service upgrade are the usual options.
Can I install the charger myself?
Technical Safety BC says an electrical installation permit is required and tells owners to hire a licensed contractor. Homeowner permits are not available for strata units or non-strata duplexes.
Why does the tool use copper?
Copper is the common case for new residential circuits. Aluminum conductors need different sizes and terminations, so leave those to an electrician.
Sources
- Technical Safety BC blog: dedicated circuit requirements for EV chargers
- Technical Safety BC: electric vehicle charger permits
- Electricity Today: guide to Canadian Electrical Code Section 8 (EV energy management systems)
- BC Hydro: how to install an EV charger at home
- BC Hydro: rebate for EV power management devices
Last verified October 8, 2026. Codes, rebates and permit rules change; confirm with your electrician, Technical Safety BC or your municipality before you rely on a result.