(3) The three conductor circuits vary considerably in design.
all are similar as far as inspection is concerned.
Some have on the
receptacle shell a small lever which must be depressed in order to pull the
plug from the receptacle.
(4) Other types have a small knurled knob on the shell of the plug
which must be depressed. When connecting the plug to the receptacle ensure
that it is properly placed in the receptacle, then when pressure is applied,
a pin springs up through a hole in the receptacle and locks the two parts
Plug connections that are made inside the shell require removal of the
shell for inspection. In some cases, the shell and plug are both threaded
and may simply be unscrewed. Others are held together by clamps and screws.
Some cable conductors are soldered to the pins, others are held by screws on
a pin lug.
a. Check the connections to the pins for looseness, corrosion dirt,
faulty insulation, broken wires, or bent pins.
Check the plug body for
damage, and dirt. Check the shell for dents, cracks and dirt.
b. When the assembly is taken apart, clean everything with a cloth and