TM 9-6115-669-13&P
l Before initial operation, provide grounding connections
between the EPP III and loads (for voltage compensation and
lightning protection) as shown in the grounding diagram
(figure 2-13). Maximum contact resistance is 100 mOhm.
l In sandy or desert conditions water must be poured into the
grounding rod (13, figure 2-14) “after” it is installed in the
earth to moisten the ground around, the grounding rod to
reduce resistance in order to effect proper grounding.
i.
Insert the grounding rod (13, figure 2-14), found on the rear of the pallet frame, or a straight
copper rod, into the ground within 40 ft (12 m) of the EPP III.
WARNING
Even if the earth is too hard to drive in the ground rod, the EPP
III still must be adequately grounded.
j.
Connect the 49 ft (16 m) grounding cable (14) stored beside PDU to the grounding bar (19) on
the PDU. Using washers (17,18), serrated lock washer (16), and nut (16). Tighten nut (16).
k.
Connect the far end of the grounding cable to the grounding rod.
l.
Connect the above 98 ft (30 m) grounding cable (20) found on top of the PDU to the grounding
bar (19) on the PDU. Using washers (23,24), serrated lock washer (22), and nut (21). Tighten
nut (21).
m. Connect the far end of the grounding cable to the ECS.
n. Connect the above 98 ft (30 m) grounding cable (26) found on top of the PDU to the grounding
bar (19) on the PDU. Using washers (28, 29), serrated lock washer (27), and nut (26). Tighten
nut (26).
o.
Connect the far end of the grounding cable to the RS.
NOTE
l An alternative is to ground the ECS and RS directly to the earth in
the same manner as the EPP III, provided suitable grounding rods
are available (see
figure 2-13).
l The US standard grounding plug (30) provides an additional
grounding connection.
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