according to the different structure and purpose of the outlet is divided into mobile, embedded wall outlet, outlet cabinet, desktop, power outlet, smart power socket, power socket functionality, industrial power outlet, power outlet and other groups
1. There is no metal exposed plastic electrical equipment, as well as double insulation (ie, with "return" character symbol) of a small electrical device, you can use the two-hole outlet.
(2) a metal casing of electrical equipment and electrical equipment with exposed metal should be used with most of the three plugs to protect. Such as refrigerators, ovens and so on.