Wiring 240 V (dryer, range, EV): the dedicated circuit
Dryer, range, EV charger, spa: these appliances need a dedicated 240 V circuit at the right rating. Here’s why a “rigged” outlet or an extension cord is a no — and how to do it right.
Each big appliance, its own circuit
Dryer, range, wall oven, EV charger, heat pump, water heater, spa: these draw too much current for an ordinary circuit. They need a dedicated 240 V circuit, at the right rating — not a “fixed-up” outlet or an extension cord.
One circuit per appliance
Never two big appliances on the same circuit: that’s a guaranteed overload.
The right wire and breaker rating
It’s calculated from the appliance’s nameplate — too small means overheating.
The right outlet (NEMA) or a direct connection
A dryer, a range and a charger don’t use the same plug.
Enough panel capacity
Adding 240 V means first checking the panel can keep up.
240 V doesn’t forgive “close enough”
An under-rated 240 V circuit means a wire heating up inside the wall — a classic fire cause. The wrong outlet means an appliance that won’t work, or worse, a shock hazard. A master electrician calculates the load, picks the right wire, protection and outlet, and checks your panel has the capacity before connecting.
Adding a 240 V circuit, correctly
Check the panel
We calculate the load and confirm capacity — or add load management / an upgrade.
Rate the circuit
Wire and breaker chosen from the appliance’s nameplate.
Install the right outlet
The exact NEMA plug (dryer, range, charger) or a direct connection.
Test and document
We verify operation and give you a detailed invoice.
A 240 V appliance to connect?
Dryer, range, charger, spa: we install the right dedicated circuit, at the right rating, checking your panel. CMEQ member · RBQ licence · 5-year warranty.
What people ask us
Why does a 240 V appliance need a dedicated circuit?+
Because it draws a lot of current. Sharing it with something else would overload the circuit. A dedicated circuit, with its own breaker at the right rating, powers the appliance safely without overheating the wire.
Can I use an extension cord for my dryer or charger?+
No. These appliances must be hard-wired to a fixed circuit at the right rating. An extension cord heats up, degrades and becomes a fire hazard — a no-go for 240 V.
Are all 240 V outlets the same?+
No. There are several plug formats (NEMA) depending on the appliance and amperage: a dryer, a range and a charger don’t use the same one. Using the wrong outlet is dangerous and often won’t work.
Can my panel take a new 240 V circuit?+
It depends on its capacity and available space. We calculate the load first: sometimes there’s room, sometimes it needs load management or a 200 A upgrade. A master electrician decides before installing.
How much does it cost?+
It depends on the appliance, the rating and the distance to the panel. At Groupe Quenneville, a regular service call is $150 plus $140/hr (1 hr minimum). We assess and quote with no surprises — 514-503-1353.
