The most important factor is determining the total load of the generator. If you only plan to use the generator for emergency power, you may want to purchase a single-circuit automatic transfer system. If you have a large generator, you will likely need several circuits. The best option depends on how much power you will use. There are several factors to consider when selecting an automatic transfer switch. How Do I Select an Automatic Transfer Switch for a Generator?īefore purchasing an automatic transfer switch, you must understand the features of the one you are going to install. They are also usually installed right into your main power service and require a certified electrician to install them. Keep in mind these larger transfer switches usually have auto transfer options. For larger permanent mounted generators like propane, natural gas or diesel the common sizes for transfer switch are 100 and 200 amp respectively. For smaller size gas generators the transfer switches com in common sizes of 30 and 60 amps. This is assuming you have the loads balanced to load up both legs of the power output equally. Can I Use a 100 Amp Transfer Switch With a 200 Amp Service?Įach size corresponds with the wattage of the generator.Should You Turn Off Main Breaker When Running Generator?.What Is the Difference Between a 30 Amp and a 50 Amp Transfer Switch?.How Much Does it Cost to Install a Transfer Switch?.How Do You Size a Manual Transfer Switch?.How Do I Select an Automatic Transfer Switch for a Generator?.A service entrance version is also UL 1008 listed and makes use of a UL 489 listed circuit breaker. The RA switch is also available in Service Entrance models. When stable utility voltage returns, the transfer switch will automatically switch electrical load from the generator to the utility. When utility power becomes unsatisfactory or fails the generator set is signaled to start, then automatically transfers the load. The RA transfer switch monitors utility power 24 hours a day and 7 days a week. These RA products adhere to National Electrical Code (NEC) and National Fire Protection Association (NFPA) requirements. These UL 1008 switches are suitable for standby power systems in residential and light commercial applications. The switch and generator set combination is specifically designed for a simplified, quicker installation. These products are Listed to UL 1008, the Standard for Transfer Switch Safety. The RA Automatic Transfer Switch is integrated with the RS series genset.
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