TM 5-4320-274-14&P
d. If the large pin socket of the power source receptacle is not connected to the power source ground system, install
a ground lead, not smaller than No. AWG 6 copper wire as indicated in figure 4-2.
e. Connect the other end of the ground lead to the closest ground system, an underground metallic water piping
system or the steel frame of a building.
Figure 4-2. Ground lead installations.
4-2