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Sides and bottom of each light base shall be sandblasted immediately prior
to installation. Inside faces of bored hole and bottom and sides of light
base shall be covered with a coating of sealant that will completely fill
the void between concrete and base. A jig or holding device shall be used
when installing each light fixture to ensure positioning to the proper
elevation, alignment, level control, and azimuth control. Light fixture
shall be oriented with the light beams parallel to the runway or taxiway
centerline and facing in the required direction. Outermost edge of fixture
shall be level with the surrounding pavement. Surplus sealant or flexible
embedding material shall be removed. The holding device shall remain in
place until sealant has reached its initial set. Fixture lead wires shall
be properly arranged with respect to their connecting position. The
wireway entrance into the light recess shall be blocked to retain the
sealant material during curing.
3.12.7
Installation of Circuit Wires in Pavement
Wires shall be placed in saw kerfs and anchored at bottom by means of
rubber or plastic wedges or noncorrosive metal clips placed every 600 or
900 mm 2 or 3 feet or as often as necessary to hold the wire down. Wires
crossing existing joints shall be encased in a 600 mm 24 inch length of
flexible tubing of polyethylene material conforming to ASTM D 1248, Type II
or Type III, to break the bond between the wires and the sealing material.
Flexible tubing shall be centered on the joint and of sufficient size to
accommodate the wires to allow for movement of the wires as the joint opens
and closes. Ends of tubing shall be wrapped with tape to prevent entrance
of sealing materials. The adjacent joint area shall be packed temporarily
with roving material, such as hemp, jute, cotton or flax, to prevent
sealing material from flowing into the open joint. Sealing materials shall
be carefully mixed and applied in accordance with the manufacturer's
instructions and at the recommended temperature. Surplus or spilled
material shall be removed.
3.13
SPLICES FOR AIRFIELD AND HELIPORT LIGHTING CABLE
3.13.1
Connectors
Kit type connectors shall be used to splice 5 kV single-conductor series
lighting cables. During installation and prior to covering with earth,
mating surfaces of connectors shall be covered until connected and clean
when plugged together. At joint where connectors come together, heat
shrinkable tubing shall be installed with waterproof sealant with two
half-lapped layers of tape over the entire joint. Joint shall prevent
entrapment of air which might subsequently loosen the joint.
3.13.2
Splicing Fixtures to the Wires in Pavement Saw Kerfs
Splices shall have preinsulated watertight connector sleeves crimped with a
tool that requires a complete crimp before tool can be removed. Splice
shall be taped with plastic insulating tape.
3.14
GROUNDING SYSTEMS
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NOTE: The preferred method of grounding is to have
grounding circuits separate and not connected to the
counterpoise. The light fixtures, equipment and
SECTION 16526A
Page 38
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