Series lighting cable systems generally have small conductor sizes (No. These circuits use underground construction methods placing them in raceways or by direct burial. The loop formed by routing a single wire from the constant current regulator source to each load (one after the other) and returning to the source simplifies the series lighting circuit wiring. The 6.6A constant current and voltage range of each size (VA rating) or isolation transformer sets up the requirement for the fixture lamps. But remember one note of caution: You must match the lighting fixture lamps in these circuits. This device transforms the current of the primary series circuit (either 6.6A or 20A) to a secondary current of 6.6A while limiting the secondary voltage to 135V or less. You connect series lighting loads through a series-to-series isolation transformer. Manufacturers offer constant current regulators in both air- and oil-cooled varieties, with the latter generally used for the larger (50kW and 70kW) sizes and higher input voltage (2400V) types. The regulator maintains the output current to within 1% of the nominal setting over a wide range of input voltage and load conditions. It typically uses a ferroresonant type transformer and a solid-state control system. This regulator supplies the electrical energy to the series circuits. The constant current regulator, isolation transformer, and series circuit wiring are the three major components of this type of lighting circuitry.Ĭonstant current regulator. This is in contrast to the more common use of constant voltage, variable current circuits to supply electrical energy in everyday applications. A series lighting circuit uses a constant current, variable voltage source to supply electrical energy to the loads connected to the circuit. It's technically sound, simplistic, flexible, reliable, and it's cost effective. Economically, how can you serve and control this lighting? One solution is to use series lighting circuitry. But local utility service is only available at one location along the area's perimeter. Just imagine: You have a large number of small lighting loads scattered approximately 100 ft apart over a large area covering several square miles. But what exactly is it, and when should you use it? Although some campus-type facilities use it, series lighting continues to dominate airfield lighting applications.
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