502-A-TC-P - Dimmable, for 2 F30T12 or F40T12 lamps
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- Applications & Wiring
Click on an application to see how to wire the 502-A-TC-P for that specific lamp.
Normal Power Factor:
Power factors that have not been corrected above 90%. Typically an uncorrected power factor is 40-60%.
High Power Factor:
Power factors that are greater than 90% and have been corrected above 90%.
(Underwriters Laboratories Inc) Laboratory that sets safety standards for building materials, electrical appliances and other products.
(Closed Cabinet) Ballasts rated for small enclosed areas.
Ballast Factor (Light Output):
A measure of the light produced by a lamp operated by a ballast compared to the light produced by a laboratory standard lamp operated by a reference ballast. Expressed as a percentage.
BEF (Ballast Efficiency Factor):
This is the ratio of ballast light output to the input power. Used to compare
different ballasts on a light output to power consumption basis. BEF = % light output / input power (watts)
An operating temperature classification for electrical components established by UL. Class B allows operation up to 130ºC.
An operating temperature classification for electrical components established by UL. Class H allows operation up to 180ºC.
The UL classification for thermally protected ballasts. Indoor fluorescent fixtures are required to have thermally protected ballasts. Internal thermal protector removes input power whenever specified temperature limits are exceeded, about 100-110ºC.
initial high voltage to break down the arc tube and initiate the flow of current. During the starting the cathode should establish the hot spot in 15 to 30 milliseconds. Usually identified by the single pin base. No preheating of the filament is required. Also a line of ballasts and lamps that utilize instant start usually T12 at 425mA, but also T8 and T6 at 300mA, 2’-8’ with single pin bases.
A ballast that operates principally through the use of current carrying copper or aluminum coils assembled on a magnetic steel core, instead of electronic components, to operate lamps.
A circuit where the electrode heating voltage and the starting voltage are applied to the lamp simultaneously through small, low-voltage filament windings. The open circuit voltage of the ballast is adequate to start the lamp only after the filaments have heated to emission temperature, and the lamps light when the electrodes have reached the proper temperature. The electrode heat remains on all the time the lamps are burning (continuous cathode heat). Also a family of lamps and ballasts that utilize continuous electrode heat. The family may contain the F40 line, which runs at 430mA, the HO line, which runs at 800mA, and the PG/VHO/SHO line, which runs at 1500mA.
A circuit where the lamp electrodes are heated by a switch, glow bottle starter, or electronic circuit prior to operating the lamp. When the filaments have heated up, the starter opens and the ballast then provides a suitable voltage to light the lamp and limits the current flow to the proper value. Several seconds are required to complete the starting
operation. Preheat lamps must use preheat ballasts.
A variation of the preheat start circuit, the ballast operates preheat lamps in a rapid start manner by suppling continuous voltage to the electrodes to heat them to the proper temperature. Upon starting, the electrode voltage is reduced about one half to reduce the losses.
A device inside of the ballast, which senses the temperature and will disconnect the input power whenever the limit is exceeded. This usually consists of a bimetal switch. This protection guards against excessive temperatures, which may be caused by abnormal voltage. Thermal protection may be of two varieties, automatic resetting or nonresetting (like a fuse). When a nonresetting protector operates, the ballast may be permanently inoperable, and must be replaced. If the thermal protector meets certain UL specifications, the ballast can be classified as "Class P".
Total Harmonic Distortion:
The combined effect of harmonic distortion on the AC waveform produced by a ballast or other device. Expressed as a percentage. Excessive levels of THD can create large currents on the neutral line of a four-wire Wye three-phase system.
A function of the ballast, it is the ratio of the peak current value divided by the RMS current value. May be voltage or current crest factor. Usually high current crest factors result in reduced performance and ballast life.
A programmed-start ballast is a more advanced version of rapid start. This ballast applies power to the filaments first, it allows the cathodes to preheat and then applies voltage to the lamps to strike an arc. This ballast gives the best life and most starts from lamps, and so is preferred for applications with very frequent power cycling such as vision examination rooms and restrooms with a motion detector switch.
(Underwriters Laboratories Inc.) Laboratory that sets safety standards for building materials, electrical appliances and other products. Canada and United States UL Listed