If you don't do a lot of commercial work, you may see a system like the one above and wonder what the heck it is. It is a 100% fresh air unit or a makeup air unit. You will see them more and more as codes start to reflect that balanced ventilation and conditioned outdoor […]

First off, the correct acronym for a GFI (ground fault interrupter) is a GFCI (ground fault circuit interrupter). The purpose is to act as a safety device to protect from electrical shock. GFCIs can be built into outlets, circuit breakers, and even extension cords and are generally used for safety in wet environments like bathrooms, […]

Capacitors are traditionally tested with a capacitance meter (commonly found as a function within a multimeter), with the component taken entirely out of the circuit. “Bench testing,” as this method is referred to, is hands-down the safest method of checking capacitance in microfarads. All other methods require the capacitor to be wired into the circuit […]