Transfer Switch Withstand Ratings: 3-cycle or 30-cycle?

How and when to apply “3-cycle rated” vs. “30-cycle rated” transfer switches should be a rather important consideration for a design engineer.  A coordination study is a critical element that must go hand-in-hand with the design and specification of a safe and reliable emergency power system. Some basic definitions Interrupting ratings  – the highest current at rated voltage that a device is intended … Read more

Is a Radiator-mounted Load Bank a Good Fit for Your Project?

Generator load banks offer a safe and reliable method for the periodic testing of emergency generators.  This article discusses a specific load bank design known as a radiator-mounted load bank. As the name implies, these load banks are installed in front of the engine radiator, and they utilize the cooling air provided by the engine radiator’s … Read more

Why You Should NOT Rely Solely on Engine Silencer Attenuation Grades.

For as long as I can remember, engine exhaust silencer manufacturers have used attenuation “grades” to describe the expected performance of their products. “Critical”, “hospital”, and “residential” are some of the common grades used today. As an attempt to differentiate themselves from one another, silencer manufacturers have come up with new grades such as “super critical”, “super hospital” and even “extreme”! … Read more

SCAC, CAC, AATAC, what does it all mean?

New emission regulations have led to massive changes in the way diesel engines are cooled. Older engines had a single jacket water circuit (using a mixture of ethylene glycol and water) that was responsible for removing heat from the engine and transporting it to a radiator. Simple enough, right? Fast forward to today! Engines are … Read more