Can I Connect Unlimited Christmas Light Strings?
Short Answer: No
The number of light strings you can safely connect in series is limited. Factors like bulb type, power consumption, string length, and wire gauge all play a role.
Longer Answer:
- UL Listed Lights: Pre-wired sets and light strings with an Underwriters Laboratory (UL) listing have a maximum combined power limit of 210 watts when connected in series.
- Example: A 50-watt light string means you can connect a maximum of 4 sets in series (50 watts x 4 strings = 200 watts).
- LED Advantage: LED lights typically have lower wattage, allowing you to connect more strings in series. A 2.4-watt LED string could potentially allow over 80 sets connected together.
Exception: C7/C9 Bulbs
- Traditional C7/C9 bulbs and cords have different limitations.
- Maximum run length is 250 feet for cords with 18 AWG/10 Amp wire.
- Shorter 25-foot cords with 20 AWG wire are typically limited to two cords in series.
Conclusion
Always check the manufacturer's specifications for the maximum number of connectable strings. Make a note of this information for future reference, perhaps in a Christmas lights inventory spreadsheet. Safety first!
Originally published 11/1/2019, refreshed and republished on 8/31/2024