Choose the charging level from actual use
Level 1 charging uses a standard receptacle and is often enough for low daily mileage. Level 2 equipment uses a dedicated 208/240-volt circuit and can deliver substantially more energy overnight. The vehicle, charger and utility rate plan determine the useful speed; a larger charger is not automatically better if the car cannot accept it or the home's service cannot support it.
Record the EVSE nameplate input, maximum current, voltage, plug or hardwired connection, indoor/outdoor rating, and manufacturer clearance requirements. The EV Charger Load Calculator can help compare a stated charger rating, while the Service Size Calculator and Panel Upgrade Estimator help identify when a full load assessment is needed.
Check service capacity before shopping
Do not add the charger rating to the main breaker and call that the service load. A proper CEC Section 8 calculation considers dwelling demand, heating, range, dryer, water heating, HVAC, existing feeders, and the EVSE as a continuous load. A 100-amp service may support a particular charger with approved load management, or it may require an upgrade; the answer depends on the real installation.
- Photograph the panel label without removing its cover.
- Record service rating, busbar rating, available spaces, and existing large loads.
- Ask whether dynamic load management is listed and accepted for the application.
- Plan future EVs, heat pumps, electric water heating, and solar rather than designing only for today's devices.
Plan the route and location
Measure the path from the panel or disconnect to the parking position, including bends and vertical rises. Longer routes can require larger conductors for voltage drop; use the Voltage Drop Calculator as a planning screen, then have the installer verify conductor ampacity, raceway fill, temperature correction, and terminations. Outdoor EVSE needs weather-rated equipment, protected wiring, appropriate mounting, and a location that avoids vehicle impact and water accumulation.
Keep the connector accessible without crossing walkways or creating a trip hazard. Follow the manufacturer's instructions for mounting height, ventilation, cable management, and disconnecting means. A garage installation may also need protection from impact, combustible storage, and the building's fire separation.
Permits and inspection
In Ontario, a new EV circuit, hardwired EVSE, panel alteration, or service upgrade requires ESA notification and inspection. Other provinces have their own authorities and processes. Use a Licensed Electrical Contractor who can obtain the permit, coordinate utility work if required, install listed equipment, test the circuit, and provide the inspection record. Do not energize a new circuit before approval.
Questions for an installer
- What load calculation supports the proposed charger?
- Is the equipment hardwired or receptacle-connected, and is the device rated for that method?
- What cable, conduit, breaker, GFCI/AFCI protection, disconnect, and grounding method apply?
- How will the installation be protected from impact, water, and future renovations?
- What happens if the service cannot support the requested charging rate?
Common DIY errors
- Installing a 14-50 receptacle on an undersized or shared circuit.
- Using a range receptacle as a shortcut without verifying the EVSE and circuit design.
- Ignoring continuous-load rules, voltage drop, or panel busbar limits.
- Running cable through a finished wall without protection or inspection.
- Assuming a portable charger makes a permanent installation exempt from local requirements.
Think about ownership and future changes
Keep the charger manual, permit record, inspection confirmation, circuit label, and test results with the home's documents. A future vehicle may use a different connector or charging current, and a second vehicle may require load management rather than a second unrestricted circuit. Ask the installer whether the equipment firmware, network connection, disconnect location, and replacement parts can be supported long term. Planning for maintenance and future electrification now is safer than modifying a live installation after the garage is finished.
When to hire a licensed professional
Always use a Licensed Electrical Contractor for a Level 2 installation, new circuit, panel alteration, service upgrade, outdoor charger, load-management system, or any work inside a panel. Stop if the panel shows heat, corrosion, incompatible breakers, aluminum conductors, no clear grounding path, or no spare capacity. Charging equipment operates for hours at high current; correct design matters every day, not only during a quick test.