What size should the socket switch in the distribution box be

1) When the electric box is only a lighting electric box or small power, and the incoming line is less than 10 square meters, if the number of switches is less than 20, the switch width plus 20mm on each side is the width of the electric box, the height is the. 1) When the electric box is only a lighting electric box or small power, and the incoming line is less than 10 square meters, if the number of switches is less than 20, the switch width plus 20mm on each side is the width of the electric box, the height is the. Standard sizes vary by type, but single-gang boxes are typically around 2″ × 3″ × 3. 5″, while junction boxes often measure 4″ × 4″ with multiple depth options. What size elect...