The process for doing this once for a fix is pretty straightforward, but if you need custom Christmas lights that require numerous splice connections it can be overly time consuming and not advisable.

Can you join 2 sets of Christmas lights together?

DEFINITION: Maximum connectivity refers to the maximum number of strings you can connect end to end in a single circuit. (Or how many plugs you can stack on top of each other when you are working with craft lights.) … Connect no more than two 20-AWG 25-foot cords in series in a single run.

Why do my Christmas lights have 3 wires?

The string of light is designed to daisy chain. The end of one can plug into the start of the next one. The lights are in series between the neutral at one end and the hot at the other end. Thus three wires – hot, neutral, and the series lights.