(3)
Verify correct connection.
(4) Verify tightness of accessible bolted electrical connections
by calibrated torque-wrench method.
(5) Verify that all required grounding and shorting connections
provide good contact.
b.
Electrical Tests
(1) Perform resistance measurements through all bolted
connections with low-resistance ohmmeter
(2)
Perform insulation-resistance tests.
(3)
Perform polarity tests.
(4)
Perform ratio-verification tests.
][3.4.7.7
Metering
a.
Visual and Mechanical Inspection
(1) Compare equipment nameplate data with specifications and
approved shop drawings.
(2)
Inspect physical and mechanical condition.
(3)
Verify tightness of electrical connections.
b.
Electrical Tests
(1) Verify accuracy of meters at 25 percent, 50 percent, 75
percent, and 100 percent of full scale.
(2) Calibrate watthour meters according to manufacturer's
published data.
(3)
Verify all instrument multipliers.
]3.4.7.8
Grounding System
a.
Visual and mechanical inspection
(1) Inspect ground system for compliance with contract plans and
specifications.
b.
Electrical tests
(1) Perform ground-impedance measurements utilizing the
fall-of-potential method. On systems consisting of interconnected
ground rods, perform tests after interconnections are complete.
On systems consisting of a single ground rod perform tests before
any wire is connected. Take measurements in normally dry weather,
not less than 48 hours after rainfall. Use a portable ground
testing megger in accordance with manufacturer's instructions to
test each ground or group of grounds. The instrument shall be
equipped with a meter reading directly in ohms or fractions
SECTION 16301N
Page 45
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