EV Charger Breaker Size and Wire Size in BC (Level 2)

A Level 2 EV charger in BC goes on its own dedicated circuit, and the breaker is sized above the charger's rated current because the charger runs for hours. In practice a 32 A charger sits on a 40 A breaker, a 40 A charger on a 50 A breaker and a 48 A charger on a 60 A breaker. The wire follows the breaker, and the whole thing is permitted, inspected work for a licensed electrician.

Why does an EV charger need a dedicated circuit?

Technical Safety BC describes a dedicated circuit as a single breaker and wiring path used only by the charger, and says the BC Electrical Code requires one. Level 2 and Level 3 chargers always need their own circuit; Technical Safety BC highly recommends one even for Level 1. Sharing a circuit with another appliance can cause tripped breakers, inconsistent charging, overheated wires and fire risk.

The reason is time. A kettle draws a lot for three minutes. A charger draws a lot for six to fourteen hours, which is how long Technical Safety BC says a Level 2 charge typically takes. Everything in the circuit has to be comfortable at that current for the whole night.

Why is the breaker bigger than the charger?

The Canadian Electrical Code treats a load as continuous when it runs for more than one hour in any two-hour period (Rule 8-104, for loads up to 225 A). For a breaker with no continuous-duty marking, the Code limits a continuous load to 80% of the breaker rating. Turn that around and the breaker must be at least 125% of the charger's rated current.

The current column is the charger's output setting, not the number printed on the plug. Many chargers can be set lower than their maximum, and that setting is what the circuit is built for. Our EV charger circuit calculator does this arithmetic for you and also checks the result against your service size.

What wire size does a Level 2 charger need?

The conductor is chosen so its allowable ampacity, from the Code's ampacity tables, is at least the breaker size. The gauge therefore steps up with the charger: a 60 A circuit needs heavier copper than a 40 A one, and a long run to a detached garage may need a larger conductor again to limit voltage drop. Aluminum conductors, conduit fill, bundled cables and hot locations all change the answer. That is why we do not print a single gauge here. The electrician sizes the wire from the Code table for the actual route, and the inspector checks it.

Plug-in or hardwired?

BC Hydro's single-family rebate accepts either a plug-in or a hardwired charger, as long as it is a permanent wall-mounted installation. Both routes need a permit. Two points worth knowing:

• A 240 V outlet on its own is not the rebate. BC Hydro says installing only a 240 V outlet is not an eligible cost; the rebate is for the charger and its installation together.
• Existing outlet. If a permitted 240 V outlet is already there, you can buy a plug-in charger and apply for the charger rebate without new electrical work, but BC Hydro asks you to confirm that a permit was obtained when the outlet went in.

Does the charger size change what I pay?

Yes, in two ways. A higher-current charger needs a heavier circuit, so materials go up with the amperage and the length of the run. More importantly, a 48 A charger takes a 60 A slice of your service, and on a 100 A house that may push the load calculation past what the service can carry. At that point the choice is a smaller charger setting, an EV power management device or a service upgrade, which we lay out in EV charger service upgrades in Victoria. The published cost ranges for the whole job are in our EV charger installation cost guide.

What if my panel cannot spare 50 or 60 amps?

BC Hydro describes an EV power management device as a control that keeps the charger from overloading a branch circuit, panel or service, and says it can often avoid a service upgrade. It works in one of two ways: sharing the charger's circuit with another appliance, such as a dryer, and cutting the charger when that appliance runs; or monitoring the whole home's current and throttling the charger to stay within a limit. The Code recognizes this: when an EV energy management system controls the charger, its demand does not have to be counted in the calculated load (Rule 8-106). BC Hydro adds $200 to the charger rebate when an eligible device is installed under permit on or after December 1, 2023. The claim steps are in the BC Hydro EV charger rebate guide.

Who can size and install the circuit?

Technical Safety BC says EV charger installations are regulated electrical work that needs an electrical installation permit, and that a licensed contractor must perform the work. Homeowner permits exist only for fully detached dwellings, and Technical Safety BC's own charger guidance still points owners to a licensed contractor. Permits, who issues them in Greater Victoria and what happens to the rebate without one are covered in do you need a permit to install an EV charger in BC.

Does the circuit affect my electricity bill?

Not the circuit, but the charger's schedule does. BC Hydro's optional time-of-day pricing takes 5 cents per kWh off electricity used between 11 p.m. and 7 a.m. and adds 5 cents per kWh from 4 p.m. to 9 p.m. A charger with a timer or a smart schedule lets you fill the car in the discount window. BC Hydro also allows a separate EV-only meter so time-of-day pricing applies to the charger alone; adding one means a contractor and BC Hydro's express connection process.

Next step

Tell us the charger you have in mind, where it will mount and the size of your service, and we will confirm the breaker, the wire route and whether load management or an upgrade is in play. See our EV charger installation service or request a free quote. Confirm Code questions with Technical Safety BC or your electrical inspector.

Frequently asked questions

Sources

• Technical Safety BC blog: dedicated circuit requirements for EV chargers (October 29, 2025)
• Technical Safety BC: electric vehicle charger permits
• Electricity Today: guide to the Canadian Electrical Code Section 8 (Rules 8-104, 8-106, 8-500)
• BC Hydro: EV charger rebate for single-family homes
• BC Hydro: rebate for EV power management devices
• BC Hydro: time-of-day pricing