Wiring electrical outlets is a common task for DIYers, but it’s important to get it right for safety and code compliance. One of the most misunderstood methods is wiring outlets 'in series.'
how to wire outlet in series
In this guide, we’ll explain what people usually mean by wiring in series, whether it’s the correct approach, and how to safely wire multiple outlets on a single circuit (often mistakenly called 'in series').
🔌 What Does “Wiring in Series” Really Mean?
Technically, wiring outlets in series—where electricity flows through one outlet before reaching the next—is not done in residential electrical systems.
Instead, outlets are wired in parallel, even though the physical wiring might appear to be “daisy-chained” from one to the next.
✅ In parallel wiring, each outlet gets the full voltage (120V in most homes) and one outlet’s failure won’t affect the others.
🛠 Tools & Materials You’ll Need
-
Screwdriver
-
Wire stripper
-
Voltage tester
-
12 or 14 AWG electrical wire (depending on circuit)
-
Electrical tape
-
Duplex outlets (receptacles)
-
Electrical boxes
-
Wire nuts
⚠️ Safety First!
-
Turn off power at the circuit breaker before starting.
-
Use a non-contact voltage tester to confirm the power is off.
-
If unsure, consult a licensed electrician.
🔧 How to Wire Multiple Outlets on One Circuit (Daisy Chain Method)
Step 1: Run the Power Cable to the First Outlet Box
-
Use NM cable (Romex): 14/2 for 15-amp circuits, 12/2 for 20-amp.
-
The cable should enter through a knockout in the outlet box.
Step 2: Wire the First Outlet
-
Strip insulation from the black (hot) and white (neutral) wires.
-
Connect:
-
Black (hot) wire to the brass terminal.
-
White (neutral) wire to the silver terminal.
-
Bare copper (ground) to the green screw.
-
-
If you're daisy-chaining:
-
Use the second set of terminals on the outlet to run wires to the next receptacle.
-
🔁 Alternatively, splice the wires using wire nuts and pigtails (a short wire leading to the outlet). This is more reliable and preferred by many electricians.
Step 3: Connect the Second Outlet
-
Run the next cable from outlet #1 to outlet #2.
-
Repeat the same wiring:
-
Black to brass
-
White to silver
-
Ground to green
-
Step 4: Test the Circuit
-
Once all outlets are installed and the cover plates are on:
-
Turn the breaker back on.
-
Use a plug-in outlet tester to verify correct wiring.
-
🧠 Tips & Best Practices
-
Don’t overload the circuit: the more outlets you add, the higher the total potential load.
-
Use pigtails to reduce reliance on receptacle terminals.
-
Never mix wire gauges (don’t use 14 AWG on a 20-amp breaker).
-
Label the circuit at your breaker panel.
❓Common Questions
❓ Can outlets actually be wired in true series?
No. If you wired them in true series (hot ➝ outlet ➝ outlet ➝ neutral), they wouldn’t work properly. Each device would reduce the voltage for the next—just like batteries in a flashlight. This is not safe or code-compliant.
❓ How many outlets can I wire this way?
It depends on the circuit size and the total expected load, but:
-
15-amp circuit: around 8–10 outlets
-
20-amp circuit: up to 10–12 outlets
These are general guidelines, not strict limits.
🔌 Conclusion
When someone says they're wiring outlets 'in series,' they usually mean they're connecting multiple outlets on one circuit, which is really parallel wiring using a daisy-chain or pigtail method. It's a safe and standard practice—when done right.
Always turn off the power, follow electrical codes, and when in doubt, hire a pro!
