MIL-HDBK-1025/10
d. Use a megohmeter to measure the insulation resistance between cable assembly
conductors and each conductor and ground. A 500-volt megohmeter can be used for 450-volt
cables but a 5,000-volt megohmeter should be used for 4,160-volt cables. Record insulation
resistance values. Record lowest acceptable value on ship connect/disconnect form. If the cable
does not meet insulation resistance requirements (refer to par. 9.6.3) it should be replaced.
Initiate shop testing and repair for such cables.
e. Use the megohmeter to verify phase identification markings of the cable assembly to
ensure proper orientation.
f. Tag shore power cable assembly with "DANGER-HIGH VOLTAGE" signs. Barricade
the work area surrounding the ship's shore power receptacles. Hang plugs on the pier electrical
outlet assembly to which they will be connected.
Checking Shore Receptacles
9.7.2
WARNING
Tag out shore power receptacle circuit breakers in accordance with below
listed tag out procedures or local activity prepared procedures.
Disconnect equipment such as meters or indicating lights that could be
damaged by a megohmeter test or cause a false reading.
a. Remove indicator light and phase meter fuses. Ensure multimeter is in proper
operating condition by testing the meter on a known energized source before testing shore
receptacle power terminals.
b. Open access cover to each shore power receptacle and use a multimeter to test
terminals in each shore power receptacle to ensure that they are de-energized. Clean each cover
and receptacle. Inspect each cover gasket and each receptacle gasket for cuts, tears, cracks, and
deformation. Inspect each receptacle conducting surface for pitting, corrosion, and evidence of
overheating. Operate each receptacle interlock switch manually; movement should be smooth
with no binding or sticking.
c. Use a suitable megohmeter and test the insulation resistance between each receptacle
terminal and between each terminal and ground. Minimum insulation resistance is one megohm
for 480-volt receptacles and 5 megohms for 4,160-volt receptacles. Reinstall indicator light and
phase meter fuses. Close shore power receptacle access covers. Remove "DANGER" from
shore power circuit breakers and receptacle circuit breakers and replace with "CAUTION" tags in
accordance with tag out procedures. Indicate on `CAUTION" tags that if shore receptacle power
interlock and/or power control power transformer fuses are removed or blown, shore receptacle
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