⚡️ 1. Circuit Sizing (Continuous Load Rule)
EV chargers are considered a continuous load, which means the circuit must be rated at 125% of the charger’s load.
- Charger rating: 40A
- Required circuit: 40A × 125% = 50A
So you need:
- A 50A circuit breaker is needed for the charger wire, a double-pole breaker is recommended.
- Wiring rated for 50A
- Copper wire: #6 AWG
- Aluminum wire: #4 AWG (larger due to lower conductivity) we don’t recommend this
⚙️ 2. Panel Capacity
You need to ensure your electrical panel has capacity for the new load.
Two key checks:
- Physical space for a new double-pole breaker
- Ampacity check to make sure your main panel can handle the total load with the charger added
Load Calculation (CEC Rule 8-200)
- You may need a demand load calculation done by an electrician to confirm your service (typically 100A or 200A) can support the new charger.
⚡️ 3. Breaker Type
- Double-pole 50A breaker compatible with your panel brand (e.g., Square D, Siemens, etc.)
📏 4. Wiring Requirements
- Conductor size: #6 AWG copper (min)
- Conduit or cable: NMD90, TECK90, or conduit with individual conductors
- Rated for 75°C or 90°C insulation
🧯 5. Ground Fault Protection
- Our chargers have built-in internal protection, the same as GFCI. Therefore, a GFCI breaker is not mandatory from our side, depending on local codes only.
🏠 6. Installation Location
- Indoor or outdoor?
- If outdoor, use weatherproof enclosures and outdoor-rated wire ( IP66 for our chargers, it’s available for use outside without any shelter).
✅ 7. Permit and Inspection
- You must obtain an electrical permit from your local authority (e.g., ESA in Ontario, Technical Safety BC, etc.)
- Installation must be inspected and approved
🛠️ Summary Checklist:
| Requirement | Spec |
|---|---|
| Charger rating | 40A |
| Breaker size | 50A |
| Wire size | #6 AWG copper |
| Panel service capacity | Verified via load calc |
| Permit & inspection | Required |
| GFCI | Depends on charger/specs |
| Indoor/Outdoor rating | As needed |