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Two sizes are available, one labeled 15 for 14-to-16-gauge wire and another labeled 20 for 18-to-22-gauge wire. See All 24 Photos ...
Orange wire nuts can also accommodate wires between 22-14 AWG, but of higher voltages up to 600 volts. Yellow wire nuts can accommodate wires between 18-12 AWG, and up to 600 volts.