When installing or upgrading a garage setup, one common question that arises is: Can two garage door openers be on the same circuit? Whether you’re outfitting a double garage or simply planning efficient electrical usage, understanding this topic is crucial for safety and functionality. In this in-depth guide, we’ll explore the electrical requirements, building code considerations, safety implications, and expert tips for powering two garage door openers on a single electrical circuit.
Understanding Electrical Circuits and Garage Door Openers
Before diving into the specific scenario of powering two openers on one circuit, it’s important to grasp how circuits work in residential electrical systems.
A circuit is essentially a path through which electrical current flows. Each circuit is protected by a breaker, which limits the amount of current (measured in amps) that can safely pass through it—typically 15 or 20 amps for standard residential circuits.
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A garage door opener is a motorized device that generally draws between 3 to 6 amps during operation and less than 1 amp when idle. When two garage door openers are operating on the same circuit, the total current draw must not exceed the capacity of the circuit breaker.
Can Two Garage Door Openers Be On The Same Circuit?
The Short Answer
Yes, two garage door openers can be on the same circuit—but with certain limitations and considerations. You must assess the total electrical load, breaker size, local building codes, and future power needs.
The Long Answer: What to Evaluate
Here’s a breakdown of the main factors you should consider:
1. Circuit Load Capacity
- Standard residential circuits in garages are usually 15-amp or 20-amp circuits.
- Most single garage door openers use 3–6 amps at peak load.
- Two openers may draw 12 amps combined at peak (if operating simultaneously), still under a 15-amp circuit’s limit.
- However, any additional devices (lights, outlets, chargers) on the same circuit also consume power.
2. Simultaneous Operation
While it’s uncommon for both doors to be used at exactly the same time, it’s wise to plan for it.
- Occasional simultaneous use: Acceptable under normal load if the combined draw stays under 80% of the breaker’s capacity.
- Frequent or automated simultaneous use: A 20-amp dedicated circuit may be necessary.
3. National Electrical Code (NEC) Guidelines
- NEC allows multiple devices on the same circuit unless a dedicated circuit is required.
- Garage door openers are not required to be on a dedicated circuit, but local codes might say otherwise.
- Always check with your local authority or inspector to ensure compliance.
4. Wire Gauge and Circuit Length
- For a 15-amp circuit: use 14-gauge wire.
- For a 20-amp circuit: use 12-gauge wire.
- Voltage drop over long distances can impact performance, especially with simultaneous loads.
5. Shared Devices on Circuit
If the same circuit powers garage lights, outlets, or other tools:
- Total amperage can add up quickly.
- You risk tripping the breaker, or worse, overloading the wire.
Benefits of Putting Two Openers on the Same Circuit
1. Cost Efficiency
Running a second dedicated circuit requires materials, labor, and potentially permits. Using an existing circuit saves on:
- Wiring
- Conduit
- Breaker installation
- Electrician labor
2. Simpler Installation
Especially during new construction or upgrades, combining both openers onto one circuit can reduce complexity.
3. Space in Electrical Panel
Electrical panels have a limited number of breaker slots. Using a single circuit for both openers preserves breaker space for future expansions.
Risks and Considerations
1. Breaker Tripping
If both openers run at the same time, along with another device on the same circuit, you might trip the breaker, cutting power to the garage.
2. Overloading Wires
Sustained high loads on undersized wires can create heat, risking fire hazards.
3. Difficult Troubleshooting
When multiple devices share a circuit, diagnosing electrical problems becomes more complicated.
Professional Recommendations
1. Use a 20-Amp Circuit
If you plan to run two garage door openers on one circuit, use a 20-amp circuit with 12-gauge wire. This allows for more headroom.
2. Install GFCI Protection
The National Electrical Code requires all garage receptacles to have GFCI (Ground Fault Circuit Interrupter) protection.
- GFCIs protect against electric shock.
- Consider using a GFCI breaker or outlet upstream of the openers.
3. Label the Circuit Clearly
Label the breaker and outlets clearly in your panel box so future homeowners or electricians understand what’s connected.
4. Consult a Licensed Electrician
If in doubt, especially for retrofits or older homes, hire a professional to assess your panel’s load and recommend safe wiring practices.
Can Two Garage Door Openers Be On The Same Circuit? Here’s What the NEC and Experts Say
The National Electrical Code (NEC) does not prohibit putting two garage door openers on the same circuit as long as:
- The total amperage does not exceed the circuit’s rated capacity.
- Wiring and breakers are appropriate for the load.
- The circuit is GFCI protected, especially if it includes receptacles.
Key advice from experts:
- Don’t exceed 80% of the breaker’s rated capacity for continuous loads.
- Avoid daisy-chaining too many devices on one circuit.
- Use dedicated circuits if you’re automating door opening with smart systems or home integration.
Alternative Solutions If You’re Unsure
If you’re worried about overloading, here are a few options:
1. Install a Dedicated Circuit for Each Opener
This eliminates load-sharing concerns and provides isolation in case of failure.
2. Use Low-Power Openers
Some newer smart openers use less power and can comfortably run on shared circuits.
3. Stagger Door Usage
Configure smart controls to prevent both doors from operating simultaneously, reducing load spikes.
Final Verdict: Can Two Garage Door Openers Be On The Same Circuit?
Yes, two garage door openers can be on the same circuit—and it’s commonly done in garages with double doors. However, this setup requires careful planning:
- Use the correct breaker size (preferably 20 amps).
- Confirm wire gauge is appropriate.
- Account for other devices sharing the circuit.
- Meet GFCI and local electrical code requirements.
By following these guidelines, you can enjoy safe, efficient garage operation without overloading your home’s electrical system.
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