Andy Ask has been a consulting engineer for almost 39 years and has previously served as the director of the Indoor Air Quality Association (IAQA). He has written articles for Santa Fe, is the author of H2NØ, Mechanical Systems and Moisture Control, and has been inducted into the IAQA Hall of Fame.
Why is it called single-phase 240 when there are two opposing phases (or legs)? I wondered why we called two 120v opposing legs “single-phase 240” for years. Then someone pointed out to me that a typical “single-phase” pole transformer only has one power leg entering and two coming out. That freaked me out. How can […]
Flowing nitrogen while brazing does not mean the air was cleared first. Learn how to purge large ACR piping, choose a practical regulator setup, and estimate time and cylinder use.
First off, the correct acronym for a GFI (ground fault interrupter) is “GFCI” (ground fault circuit interrupter). The purpose is to act as a safety device to protect from electrical shock. GFCIs are important components of electrical safety; they even make an appearance in our electrical safety video. GFCIs can be built into outlets, circuit […]
Andy Ask
Andy Ask has been a consulting engineer for almost 39 years and has previously served as the director of the Indoor Air Quality Association (IAQA). He has written articles for Santa Fe, is the author of H2NØ, Mechanical Systems and Moisture Control, and has been inducted into the IAQA Hall of Fame.
Tech Tips written:
Event speaker: