Will a charger on a 100 amp Port Coquitlam service need a load calculation?

Yes, almost certainly. On a 100A service in Port Coquitlam, a load calculation is not optional, it is the step that tells you whether the panel can actually support a Level 2 EV charger without overloading the service, and most electricians will do one before they quote the circuit.

Why 100A services are tight for EV charging

A Level 2 charger on a dedicated 40A or 50A circuit draws a continuous load, which the BC Electrical Code treats at 80% of breaker rating for sizing purposes. That means a 50A breaker is carrying a sustained 40A load. On a 100A service that also feeds electric baseboard heat, a range, a dryer and a hot water tank, you may already be at or near the service limit during a cold evening. The load calculation adds up all the connected loads using the demand factors in the BC Electrical Code and shows exactly how many amps of headroom remain.

If the calculation shows headroom, the electrician runs the circuit and you are done. If it shows the service is too full, the options are a service upgrade to 200A (typically $3,500 to $6,000 in Metro Vancouver, more if BC Hydro needs to replace the service drop or meter base), a load management device that throttles the charger when the house load is high, or a smaller 30A charger circuit that draws less continuous current. Load management hardware adds roughly $300 to $800 to the job but can avoid a full service upgrade.

Port Coquitlam issues its electrical permits through Technical Safety BC, not through the city's own building department. That means the electrician pulls a Technical Safety BC permit, the work is inspected by a Technical Safety BC safety officer, and the permit fee is typically in the $100 to $200 range for a residential circuit. The load calculation is part of what the inspector expects to see justifying the installation.

A fair quote for this job should include the load calculation, the dedicated circuit, the permit and inspection fee, and any load management hardware if needed. Ask the electrician whether the quote covers BC Hydro coordination if a service upgrade turns out to be necessary, because Hydro's disconnect and reconnect for a panel change runs around $1,200 and is not always included.

Before you hire, ask for the contractor's Technical Safety BC licence number and confirm WorkSafeBC coverage. The CleanBC Go Electric rebate for a home EV charger covers 50% of purchase and installation up to $350 for eligible single-family homes and row homes, and it requires a licensed contractor, a permit, and an application before the work starts.

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