3.5.2.1
Piping Test
a.
Lube-oil and fuel-oil piping shall be flushed with the same type
of fluid intended to flow through the piping, until the outflowing
fluid has no obvious sediment or emulsion.
b.
Fuel piping which is external to the engine-generator set shall be
tested in accordance with NFPA 30. All remaining piping which is
external to the engine-generator set shall be pressure tested with
air pressure at 150% of the maximum anticipated working pressure,
but not less than 1.03 MPa 150 psi, for a period of 2 hours to
prove the piping has no leaks. If piping is to be insulated, the
test shall be performed before the insulation is applied.
3.5.2.2
Electrical Equipment Tests
**************************************************************************
NOTE: Delete ground resistance tests where covered
by other project specifications, or where no grounds
are installed.
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a.
Low-voltage cable insulation integrity tests shall be performed
for cables connecting the generator breaker to the [automatic
transfer switch] [panelboard] [main disconnect switch]
[distribution bus] [_____]. Low-voltage cable, complete with
splices, shall be tested for insulation resistance after the
cables are installed, in their final configuration, ready for
connection to the equipment, and prior to energization. The test
voltage shall be 500 volts dc, applied for one minute between each
conductor and ground and between all possible combinations
conductors in the same trench, duct, or cable, with all other
conductors in the same trench, duct, or conduit. The minimum
value of insulation shall be:
R in megohms = (rated voltage in kV + 1) x 304,800/(length of
cable in meters)
R in megohms = (rated voltage in kV + 1) x 1000/(length of cable
in feet)
Each cable failing this test shall be repaired or replaced. The
repair cable shall be retested until failures have been eliminated.
b.
Medium-voltage cable insulation integrity tests shall be performed
for cables connecting the generator breaker to the [generator
switchgear] [main disconnect switch] [distribution bus]. After
installation and before the operating test or connection to an
existing system, the medium-voltage cable system shall be given a
high potential test. Direct-current voltage shall be applied on
each phase conductor of the system by connecting conductors as one
terminal and connecting grounds of metallic shieldings or sheaths
of the cable as the other terminal for each test. Prior to making
the test, the cables shall be isolated by opening applicable
protective devices and disconnecting equipment. The test shall be
conducted with all splices, connectors, and terminations in place.
The method, voltage, length of time, and other characteristics of
the test for initial installation shall be in accordance with [
NEMA WC 74] [_____] for the particular type of cable installed,
SECTION 16263A
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