![]() ![]() ![]() For example, this could mean that voltages impressed on one side of the insulation, in the unit, may actually be as high as 960 volts on a 480-volt AC system. It is always best to check the markings as some Total System Loads are marked “Resistance Only, Tungsten Only etc.” The overall project management hassle is greatly reduced for engineers by choosing a Total System Load from the onset of the project.Īutomatic transfer switches for used generators are unique in regards to, their electrical distribution system in that they are one of only a few electrical devices that are designed to have two unsynchronized power sources connected to it. In general, most transfer switches for used generators are rated to handle Total System Loads. However, when dealing with an incandescent (tungsten-based filament) load the total load should never exceed 30% unless the transfer switch is specifically rated to transfer a higher percentage of power to incandescent lamps. The “Total System Loads” panel indicates that the switch can be used for a variety of loads described in the previous paragraph. Underwriters Laboratory requires that all transfer switches for diesel generators be clearly marked to specify what type of load it is capable of handling. The loads listed are Total System Loads, Motor Load, Electric Discharge Lamp Loads, Restrictive Loads, and Incandescent Lamp Loads. ![]() Underwriters Laboratory or UL classifies automatic transfer switch loads under guideline UL 1008. Underwriters Laboratory is the prevailing authority figure when it comes to independent testing of electrical products. However, in the end, the most common influencing factors are price and reliability. Part one of this article will discuss the type of load, voltage rating and continuous current rating.Ĭareful selection of an automatic transfer switch is important to ensure maximum reliability and adequate capability under both normal and emergency situations. There are a number of different factors to consider when selecting an automatic transfer switch for a diesel generator, the most important being size.
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