This standard applies to the following types of devices designed for operation above 600 volts whether for indoor or outdoor service. (a) Air switches such as disconnecting@ grounding@ etc.@ for manual or automatic operation. (See 22-73@ 75 and 79) (b) Air interrupter switches. (See 22-79.3) (c) Insulator units and bus supports. (See 22-119 and 71)