Connecting more than one wire on or under a single lug or connection point is called “double lugging,” and it is ONLY allowed in line voltage wiring under one condition, according to NEC 110.14: If the terminal, lug, or connector is specifically rated for more than one wire In the case of a conductor splice, […]

DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source. Many things may deter people from working in the HVAC industry. Perhaps surprisingly, exposure to heights could be the deal-breaker. (Not […]

Understanding Heat Pump Defrost Cycles: What Homeowners Need to Know Older Heat pumps may have a bad reputation but newer heat pump technology has been a game-changer for many homeowners, providing efficient heating and cooling throughout the year. But as with any piece of equipment, they have their quirks. One particular aspect that often raises […]