UFC 3-535-01
17 November 2005
Light Bases for Lights or as Junction Boxes.
L-867
Non-load bearing (used in shoulder areas or other non-traffic areas).
L-868
Load bearing (used in RW and TW pavements and other aircraft load
areas).
Sizes
A - 10" dia. (L-868 only) C - 15" dia. (L-868 only)
B - 12" dia. (L-867 & L-868)D - 16" dia. (L-867 only)
L-869
In-pavement junction box (used with cables in saw kerfs, 6" dia.)
Airfield Signs
L-858Y
Direction, Destination and Boundary. Black legend on yellow
background.
L-858R
Mandatory Instruction. White legend on red background.
L-858L
TW and RW Location. Yellow legend and border on black
background.
L-858B
Runway Distance Remaining. White legend on black background.
Other Examples
L-849
REIL
L-880
PAPI system with 4 light units
L-881
PAPI system with 2 light units
Some of the above have variations specific for certain military applications. See
Chapter 13 for a list of qualifying equipment and specific applications for each type of
equipment.
15-10
PARALLEL CIRCUITS
Parallel (or multiple) circuits have circuit elements connected across the conductors to
which input voltage is applied. In theory, the same voltage is applied to each light,
although voltage drop occurs along the conductor, which can be significant for longer
circuits. The reduced voltage can reduce the intensity of lights at the far end of a circuit.
If intensity control is required for this type lighting circuit, tapped transformers of
inductive-voltage regulators are used, which increases the cost and reduces efficiency
of the circuit.
15-10.1
Advantages of parallel lighting circuits are:
15-10.1.1
Lower cost installation, particularly if voltage regulation and intensity
control are not required.
15-10.1.2
More efficient utilization of electrical power.
15-10.1.3
Easy to add to or reduce an existing circuit.
15-10.1.4
Circuits are more familiar to most people.
15-10.1.5
Cable faults such as open-circuits are easier to locate.
261
Previous Page
