otherwise. Nameplates shall be provided for equipment, controls, devices,
and for each lighting circuit.
3.21.1
Frangible Requirements
At the 300 meter 1,000 foot crossbar and beyond, overrun lights shall be
mounted up to 1.8 m 6 feet above concrete foundations on threaded frangible
couplings and 53 mm 2 inch rigid steel conduit. For mounting heights
greater than 1.8 m 6 feet, light shall be installed on low impact-resistant
(LIR) frangible supports. When rigid towers, trestles, and similar
structures are required, the light unit shall be installed at least 6 m 20
feet above the rigid structure with this support unit being frangible.
3.21.2
Alignment of Lights
The approach lights shall be aligned with the axes of the beams directed
towards the approach area parallel to the runway centerline. Vertically,
they shall be aimed above the horizontal at the threshold of 5.5 degrees
and increasing the elevation angle 0.5 degree for each 150 m 500 foot
interval into the approach area from the threshold. The tolerance for
vertical aiming is plus or minus 0.5 degree.
3.22
FIELD QUALITY CONTROL
The Contracting Officer shall be notified [five] [_____] working days prior
to [each] [_____] test. Deficiencies found shall be corrected and tests
repeated.
3.22.1
Operating Test
Each completed circuit installation shall be tested for operation.
Equipment shall be demonstrated to operate in accordance with the
requirements of this Section. [[One] [_____] day and [one] [_____] night
test shall be conducted for the Contracting Officer.]
3.22.2
Distribution Conductors, 600-Volt Class
Test shall verify that no short circuits or accidental grounds exist using
an instrument which applies a voltage of approximately 500 volts providing
a direct reading in resistance.
3.22.3
Counterpoise System Test and Inspection
Continuity of counterpoise system shall be checked by visual inspection at
accessible locations. Continuity of counterpoise system to the vault
grounding system shall be tested in manhole closest to the vault.
3.22.4
Progress Testing for Series Lighting Circuits
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NOTE: Progress testing should be specified when
replacing or modifying existing series airfield and
heliport lighting circuits since interruption time
is usually critical; however, progress testing on
completely new series airfield and heliport lighting
circuits is not normally necessary.
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A megger test shall be conducted on each section of circuit or progressive
SECTION 16526A
Page 42
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