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A constant-current regulator must never be operated with an open-circuit secondary. However, a short circuit, even a bolted short, on a secondary will have no immediate adverse effects if a reasonable percentage of the load remains energized.

b. Insulating transformers. Insulating transformers isolate the medium-voltage of a series circuit from the wiring and fixtures. In addition, they are sometimes used to obtain higher or lower current for lamps having a different ampere rating, or constant voltage for multiple lamps connected to a series circuit. They are sometimes referred to as isolating transformers. Unless the case and one secondary conductor are grounded, the secondary must be treated as a medium-voltage circuit:

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TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

6-16. Maintenance and troubleshooting se- lighting systems, the airfield lighting vault equip-

ries type lighting. ment, and associated control tower equipment. It

Use the recommended guidelines for the mamte- also includes troubleshooting procedures for series

nance of airport visual aid facilities given in FAA lighting circuits. AC 150/5340-26 which covers the various types of

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TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

CHAPTER 7 TRANSFORMERS AND REGULATORS

Section I-CONSIDERATIONS

7-1.

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