Marette Electrical Twist-On Wire Connectors are color coded for the number of wires and the wire sizes that they are designed to connect. Marettes are CSA approved and are available in 10 connectors per package.
In very general terms, Marettes are recommended for:
Orange Wire Connectors - Maximum of (2) #14 wires
Yellow Wire Connectors - Minimum of (2) #18 wires, Maximum of (3) #12 wires
Red Wire Connectors - Minimum of (2) #18 wires, Maximum of (4) #10
Marette Electrical Twist-On Wire Connectors - 10 Pack - Various Sizes are CSA Certified and UL Listed