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How Non-Contact Tools Increase Electrical Safety

How Non-Contact Tools Increase Electrical Safety

It’s the foundation of any electrical safety program: limiting the exposure of workers to the electrical hazards of shock and arc flash. Using test leads and clamps to probe inside a live panel when trouble-shooting and performing routine maintenance always exposes workers to danger. Electrical personal protective equipment (PPE) is a last line of defense […]

Hermetic Motors, Part 1

Hermetic Motors, Part 1

Hermetic motors are used in air-conditioning and refrigeration equipment. What makes them “hermetic” is the fact that the motor itself is immersed in the refrigerant and the case is sealed tight. This arrangement means there are different cooling and other characteristics for these motors compared to non-hermetic motors. Because of those characteristics, the NEC provides […]

Profiting from Project Conclusion, Part 4

Profiting from Project Conclusion, Part 4

When you finish a job, does knowledge gained carry over to future jobs? If mistakes were made on this job, view the cost as tuition; make sure you learn from those mistakes so you don’t pay the cost again. The same applies to problems that arose from causes other than mistakes. Some tips: Identify problems […]

Commonly Made Mistakes in Lightning Protection Projects

Commonly Made Mistakes in Lightning Protection Projects

Before going into common mistakes, let’s quickly go address ones that are less common but still bad: Installing an “active protection” system. In theory, these don’t work and we have proof they don’t work in practice either. Using unlisted parts. There are good reasons these aren’t listed for lightning protection. Using the standards as mere […]

Grounding Motors

Grounding Motors

Article 430, Part VIII is titled, “Grounding—All Voltages.” Is it really talking about grounding? When we ground something, we connect it to the earth [Article 100]. On the load side, this serves no electrical purpose. It won’t create an equipotential plane and it won’t provide a low impedance path back to the source (for undesired […]