EGC – JADE Learning

NEC Article 230, Services

Let’s take a closer look at Article 230 and the NEC 2020 Code changes, which covers service conductors and equipment for control and protection of services.

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2020 NEC | Article 590, Temporary Installations

Because temporary electrical installations present a special set of hazards, they have their own Article in the NEC code. Read more to learn about how to safely reinstall previously used services, parts, or components in a temporary installation.

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Recruiting Water and Wastewater Operators: Tips for Future Employees

This article discusses why wastewater is a good career choice, what skills and knowledge an operator needs, and how to find your first job in the water/wastewater field. 

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Developing Troubleshooting Skills for HVAC Technicians

Troubleshooting of HVACR systems and equipment can often become a time-consuming, frustrating process. Here are some fundamental concepts that can help anyone become a more proficient troubleshooter.

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The Rebirth of Analog Video Surveillance

We’re currently experiencing a resurgence of analog surveillance systems. Here’s where analog systems can work better than internet protocol (IP) ones!

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NEC 70, Article 250, Section 250.121(B), Metal Frame of Building or Structure

Article 250 is arguably the most important article in NEC 70, and much of its content is devoted to the proper sizing and installation of equipment grounding conductors. First, let us consider the purpose of an equipment grounding conductor (EGC). We know that EGC’s provide a low impedance path from the equipment to the overcurrent protective device (or ground detector for high-impedance grounded systems) so that a fault condition can be quickly cleared. Hence, EGC’s are a critically important safeguard to persons and equipment.

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Sizing Equipment Grounding Conductors (EGC) Table 250.122: What’s New in the 2020 NEC?

If you turn to Section 250.122 in your NEC, you find information that has assisted electricians sizing equipment grounding conductors (EGC) for longer than most electricians have even been twisting wire.If you were on the job in 1968, you would have turned to Table 250.95 in your NEC for this information instead of Table 250.122, but the information was essentially the same.In 1968 you also would have found that an ungrounded (hot) branch circuit conductor protected by a 6000-amp overcurrent device required no less than a 1200 kcmil aluminum equipment grounding conductor… assuming you were using an aluminum equipment grounding conductor. That information remained unchanged for 50 years. But as the saying goes, “All good things must come to an end.”

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The Isolated Ground

The Isolated Ground (IG) is a type of equipment ground that, in theory, reduces interference experienced by electronics and instrumentation from radio frequency (RF) noise, by connecting that equipment directly to the grounding terminal of the service equipment, without ever making contact with another metal component or grounded surface, that could potentially be serving as an antenna for airborne RF noise.

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What is a Main-Bonding-Jumper? Why Do We Need it?

For our typical AC electrical system, the purpose of the “Main Bonding Jumper” is to connect the equipment grounding conductors (E.G.C.) contained in each branch-circuit and the metal (conductive) service-disconnect enclosure to the Neutral Conductor of the electrical service. The reason for this is: a driven or buried earth ground […]

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NEC Article 230, Services

Most Recent

2020 NEC | Article 590, Temporary Installations

Recruiting Water and Wastewater Operators: Tips for Future Employees

Developing Troubleshooting Skills for HVAC Technicians

The Rebirth of Analog Video Surveillance

Recently in

NEC 70, Article 250, Section 250.121(B), Metal Frame of Building or Structure

Sizing Equipment Grounding Conductors (EGC) Table 250.122: What’s New in the 2020 NEC?

The Isolated Ground

What is a Main-Bonding-Jumper? Why Do We Need it?

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