How Far Can You Run an EV Charger Cable?

How Far Can You Run an EV Charger Cable?

EV charger cable length affects both the convenience of daily charging and the cost of the electrical installation. There are two distinct cable distances to consider: the length of the charging cable between the EV charger (EVSE) and your vehicle, and the length of the wiring run from your electrical panel to the charger itself. Here is what you need to know about both.

EVSE Charging Cable Length (Charger to Vehicle)

The cable attached to your Level 2 EV charger that plugs into your vehicle is typically 5 to 7.5 metres (16 to 25 feet) long. Most residential EVSEs ship with a cable in this range, which is sufficient to reach a vehicle parked in a standard garage or driveway.

Extension cords must never be used with Level 2 EV chargers (240V). Extension cords rated for 240V and 40 amps are rare, expensive, and not approved for continuous high-power use. Using an extension cord risks overheating, fire, and voiding the charger’s warranty. If the cable does not reach your vehicle, the charger itself should be repositioned — not the cable extended.

Wiring Run Length (Panel to Charger)

The wiring that runs from your electrical panel to the EV charger location can be as long as needed — but longer runs require larger wire gauge to prevent excessive voltage drop. Voltage drop reduces charging efficiency and can cause the charger to operate below its rated output.

As a general guide for a 40-amp, 240-volt EV charger circuit in Ontario:

• Up to approximately 25 metres (80 feet) — 8 AWG copper wire is typically adequate
• 25 to 50 metres (80 to 165 feet) — 6 AWG copper wire is recommended to keep voltage drop within acceptable limits
• Over 50 metres (165 feet) — 4 AWG copper or larger may be required; your licensed electrician will calculate the correct size based on the actual run length and load

These are general guidelines — your licensed electrician will calculate the correct wire size based on the actual circuit length, routing, and load to comply with the Ontario Electrical Safety Code.

Detached Garage and Underground Runs

Running an EV charger circuit to a detached garage involves a longer wiring run, typically routed underground. The Ontario Electrical Safety Code specifies minimum burial depths for underground cable — 600mm for direct-burial cable or 450mm in conduit, depending on the cable type and the terrain it crosses (more depth is required where the cable runs under a driveway).

For detached garage EV charger installations, installing a subpanel in the garage and running a larger feeder from the main panel is often more cost-effective than running individual circuits for each load. This also provides capacity for future additions such as a workshop circuit or LED lighting.

Does EV Charger Wiring Require an ESA Permit in Ontario?

Yes. Installing an EV charger circuit requires a dedicated 240-volt circuit, a double-pole breaker, and appropriate wiring — all regulated work under the Ontario Electrical Safety Code. An ESA permit is required, and the installation must be performed by a licensed electrical contractor.

Get Your EV Charger Wired by EZSMART

EZSMART installs Level 2 EV charger circuits for residential and commercial properties across Ontario, including underground runs to detached garages and multi-unit residential buildings. We calculate the correct wire size, run the circuit, and coordinate the ESA permit.

Contact us today to get a quote for EV charger installation.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp