When the support arm is not in the socket, the gate element (126) provides a substantially flush surface with the front surface of the housing.
当支撑臂不在插座中时,闸门元件(126)提供与壳体的前表面基本齐平的表面。
2
This standard does not cover requirements for flush mounting boxes: however, it covers only those requirements for surface-type mounting boxes which are necessary for the tests on the socket-outlet.