Identify Your Wall Plate Opening | Kyle Switch Plates
A single gang (or 1gang) box is only wide enough for 1 switch or outlet. A double (or 2gang) box holds 2 devices side by side. 3gang boxes are for 3 electrical devices. And so on all the way up to 10 gangs. Identify Your Light Switch Opening: All plates below are shown in the 1gang size, starting with a 1gang "Toggle" plate (example #1).