Which color of wire nut do I need?

Check the package. It will tell you what size and how many wires each color of nut will hold.

For best results, make sure you understand how to use a wire nut.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.