FAA
FAA AC 150/5345-10H is an advisory circular issued by the Federal Aviation Administration. It sets out a specification for constant current regulators and regulator monitors, the equipment that supplies series circuits for airfield lighting, and it is part of the agency series of equipment specifications for airport lighting and visual aids.
Editions cited: FAA AC 150/5345-10H
A constant current regulator holds the current in a series lighting circuit steady regardless of how many lamps are connected, which keeps runway and taxiway lights at their intended brightness steps. The circular describes the performance, construction, protection and testing expectations for these regulators, along with the monitoring devices that watch their output and the condition of the circuit. Airport owners and operators, electrical contractors and equipment manufacturers refer to it when they buy, install or accept this equipment on projects that follow FAA standards, and testing firms use it as a reference when they verify regulator output, insulation withstand and protective functions. The field tests that cite it are often commissioning checks that confirm a unit behaves as specified. The pages in this encyclopedia that cite FAA AC 150/5345-10H explain those tests in general terms and point the reader to the circular for the governing requirements.