Yes — but only as a designed installation. Several chargers may share one circuit when listed energy-management equipment caps the circuit’s total draw and divides it between the cars connected. Two chargers simply wired onto an ordinary circuit is a different thing, and it is not permitted by the design rules, because EV charging is a continuous load: the circuit is sized at 125% of the load it carries, and nothing in a plain circuit stops two chargers from drawing their full amount at once.
Key Takeaways
- Chargers can share one circuit only inside a designed installation with listed management equipment.
- The circuit’s total is capped under the 125% continuous-load rule and divided between connected cars.
- Sharing costs speed only while cars overlap; alone, a car gets the whole circuit.
- Sharing a circuit, sharing a panel, and sharing inside one dual-connector station are three different arrangements.
Three Arrangements That Get Confused
| Arrangement | What it means | Status |
|---|---|---|
| One charger, one dedicated circuit | Each charger has its own circuit, sized at 125% of its draw. | The default design most installations follow. |
| Several chargers, one shared circuit | Listed management equipment caps the circuit’s total and allocates it between the chargers in use. | Permitted where the design, the equipment listing and the local code line up — an electrician’s design, not an improvisation. |
| Several chargers, one panel or supply | Each charger keeps its own circuit, but all draw from the same service or feeder, whose total is managed or calculated as a whole. | Common in larger buildings — a different question from sharing a circuit, settled by the building’s load calculation. |
Most multi-charger buildings use the third arrangement. The second is the one this question is really about, and it exists for places where running a full new circuit to every bay is the expensive part.
How the Sharing Works
The circuit’s ceiling never moves: it is fixed by the breaker and the wiring, under the same 125% continuous-load principle — a circuit built for 40A of continuous charging sits behind a 50A breaker. The management equipment then works inside that ceiling. When one car is connected, it can take the whole allowance. When a second car plugs in, the allowance is divided between them; when one finishes, the other speeds back up. In some designs the split is fixed; in others it follows which cars are actually drawing — the behaviour our explainer on dynamic load balancing walks through, and the reason sharing does not simply mean slower charging overall.
What Drivers Notice
- Slower while both cars charge. Each car gets a share of the circuit, so a session that overlaps with a neighbour’s runs at a reduced rate.
- Full speed when alone. Nothing is held back for a car that is not there; a single connected car can use the whole circuit.
- No tripped breakers. The total is capped by design, so the circuit is never asked for more than it was built to carry.
- Overnight, it rarely matters. Cars dwell for hours in homes, apartments and workplaces; a shared allowance divided between two cars still leaves both charged by morning in typical daily use.
Who Designs It — and the Built-In Version
A shared circuit is designed and signed off by a licensed electrician, who confirms the equipment is listed for the purpose, the circuit is sized under the continuous-load rule, and the arrangement matches the locally adopted code. It is never a splitter cable or a doubled-up outlet.
The same idea exists inside a single product. The EV-AC03201T is one station with two Type 2 connectors sharing up to 43 kW between them (22 kW per connector), with OCPP 1.6J and RFID for managed shared sites; a wallbox such as the EV-ACT3204PE (22 kW, RFID and app) suits shared bays where each unit has its own circuit. Our commercial EV charging page covers the range.
Frequently Asked Questions
Can I plug two chargers into one circuit myself?
No. Sharing is a property of a designed installation — listed management equipment, a circuit sized for the combined continuous load, and an electrician’s sign-off. Plugging two chargers into an ordinary circuit gives none of those protections.
Does sharing mean my car always charges at half speed?
Only while another car is drawing from the same circuit. Alone, your car can take the full allowance; with a neighbour connected, the total is divided. Over a long overnight dwell, both cars normally finish regardless.
Is one shared circuit better than two separate circuits?
Neither is universally better. Two circuits give every car full speed at once but need the panel capacity and the cable runs to support them; a shared circuit trades simultaneous speed for a smaller electrical footprint. Your electrician’s load calculation is what decides which fits a building.
Related Reading
- What Is Dynamic Load Balancing, and Why Does Your Wallbox Home Charger Need It?
- Does Load Balancing Increase EV Charging Speed?
- Adding EV Chargers to a Building: Load Calculation Basics
- What Size Breaker Do I Need for an EV Charger?
