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Unfortunately, the excellent regulation requirements of IEC 61823 have the side-effect that the no-load voltages of these AGLST are somewhat higher than those of AGLST built to the older standards. The increase in no-load voltage is of no consequence from 30 to 100 watts, but from 150 watts upwards this increase makes them slightly more dangerous. With the pressure on airport operators to keep runways open with the minimum of down time, the Airfield Lighting Systems, Safety AGLST make it safe for lamps or luminaires to be changed without the need to shut down the primary circuit. The no-load voltage of any Airfield Lighting Systems, Safety AGLT, will not exceed 5 V a.c. r.m.s. at any time during each cycle, regardless of the wattage, or the input and output currents specified. Some other safety devices allow the voltage to rise to a dangerous peak voltage every cycle. These high peak voltages will not always be detectable on a voltmeter as the voltmeter will provide an r.m.s. or average reading. Safety AGLST are avaliable from 150 to 500 watts, otherwise to IEC 61823. | ||
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