The digital voltmeter is the best basic tool for electrical troubleshooting, because it's calibrated and exact. But remember, the digital voltmeter can't detect a high-resistance fault if the circuit ...

In Part 1 of this two-part series, we presented a 3-phase, 480VAC motor circuit with its associated controls (Figure). We stepped through a logical, systematic approach to troubleshoot the main power ...

Because the wiring and the inputs and outputs (I/Os) are the most vulnerable elements in a system, be sure to locate and identify these elements in the problem circuit. Sometimes, the only way to test ...

The SureTrace™ Circuit Tracer Pro redefines what a circuit tracer can do. With numerical voltage readings, continuity testing, AC amperage readings, contactless tracing, and receptacle testing, it's ...

Anyone who has used electrical or electronic products knows that electromechanical components such as cables and connectors are often a source of problems ranging from obvious to intermittent to ...

In "Electrical Fundamentals For HVAC/R Technicians, A Practical Approach To Electrical Troubleshooting & Servicing Comfort Cooling Systems" well-known HVAC industry trainer Jim Johnson takes the ...

Circuit breakers are at the heart of every modern power system. To ensure the systems are properly protected, it’s essential the breakers should operate correctly when called upon to do so. This means ...