Caroline Hazard is the Principal at CHH Consulting. She has over 20 years of experience in researching, designing, and implementing sustainable energy programs and practices. Her recent projects have focused on the impact of HVAC monitoring tools to optimize occupant comfort and system performance.
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 […]
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Caroline Hazard
Caroline Hazard is the Principal at CHH Consulting. She has over 20 years of experience in researching, designing, and implementing sustainable energy programs and practices. Her recent projects have focused on the impact of HVAC monitoring tools to optimize occupant comfort and system performance.
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