DEG products are not designed for Hot-Plugging – Don’t install any DEG Lamp with power ON, or ‘hot’, as it will result in voltage and current spikes that will damage the equipment and nullify the product warranty.
Recently DEG had a few “ghost failures”. With electronics there are a multitude of components that can contribute singularly or in concert with one another to cause a circuit failure but often are very difficult to pin-point the why and how a failure occurs—the industry refers to these as “ghost failures”. Finally, after extensive trial and error testing internally and contracting with two independent outside sources, Process Sciences, Inc., a Leander, Texas company, and a highly respected national firm, CASE Forensics Corporation (Portland, Oregon office) to determine the root cause of those early equipment failures, we now have a firm determination that these few failures resulted from events referred to as “over-voltage”, as well as a few of the equipment failures being caused from “Hot-Plugging” of the devices. An over-voltage event occurs when the input AC voltage is in excess of the 277VAC limit allowed for by our power supplies (i.e.: 480VAC single phase line input) while the latter event occurs when a product is connected to a “hot” input line during installation, or a lamp is screwed into an energized or “hot” socket. In the case of DEG products if the power is ON—or Hot—when the lamps are screwed into the “hot” mogul or medium base socket (“Hot-Plugging”), this can cause a power surge and create an over-voltage event and failure of the electronics. The over-voltage event is generally much more catastrophic and obvious in determining the root cause as the voltage regulator and fuse will fail.
All electrical and mechanical connections associated WITH INSTALLATION OF DEG PRODUCTS MUST BE MADE IN A MANNER THAT PREVENTS INSTALLATION OF LAMPS IN ALREADY-ENERGIZED CIRCUITS. Other components in the system must be designed so that the removal of a hot-pluggable component does not interrupt operation of the lamp or damage components. DEG’s products are not designed for removal and replacement of the lamp while the power is ‘hot’ [still ON with socket empty] and therefore the electrical input power must be turned off. Once the DEG lamp is installed in the mogul or medium socket the electrical input can be switched ON and the lamp will safely operate.