Tag: "electrodes"

Photo 1. Vertically positioned concrete-encased electrodes, such as this pier, are now recognized by NEC-2008 if all of the conditions of 250.52(A)(3) are met.

Concrete-Encased Electrodes – Let’s Go Vertical!

The year was 2005. It was a typical spring afternoon in this typical Midwest town of Anywhere, USA. The skies were a cloudy gun-barrel gray as the light rain fell and the thunder rolled in the distant background. Suddenly, without warning, the rain intensifies and the skies turn darker and darker. That distant thunder is [...]

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Photo 1. With a flame resistant (FR) rating of 8 cal/cm2, NFPA 70E-2004 Hazard Risk Category 2* requires full face and neck protection which is provided in this case by a wraparound face shield rated for a minimum of 8 calories per square centimeter. Phot

Concrete-Encased Electrodes Required

[ 0 ] By Joseph Weigel | May 12, 2007 | IAEI May-June 2007

Electrical arc-flash and shock hazards have been recognized as particularly dangerous and fairly frequent occurrences that put the lives and health of electrical workers at significant risk. Statistics indicate that five to ten arc-flash accidents that involve a fatality or serious injury to an employee occur every day in the United States. Those incidents most [...]

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Photo 1. Vapor barriers create isolation between the concrete and the earth. These are not suitable for use as concrete-encased grounding electrodes. (Photo courtesy of Robert Jones, IEC)

Concrete-Encased Electrodes Required

[ 0 ] By Michael Johnston | September 18, 2005 | IAEI September-October 2005

Part III of Article 250 provides the important concept of a grounding electrode system, where all grounding electrodes are required to be bonded together and function as a system as indicated in Section 250.50. Rather than reliance on a single grounding electrode to perform its function over the life of the electrical installation, the NEC [...]

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Concrete-encased Electrodes and the Grounding Electrode System

[ 0 ] By Michael Johnston | July 15, 2001 | IAEI July-August 2001

Most buildings or structures employ a structural design that includes a concrete footing or foundation, which connects the structure to the earth. For the building to be structurally sound and stable, a substantial foundation must be established to bring the structure out of the ground. Footings and foundations are typically constructed using concrete and reinforcing [...]

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Photo 1. In the early days, many housings were made of porcelain glazed ceramic.

Electrode Receptacles and Enclosures

[ 0 ] By Paul R. Davis | January 18, 2000 | IAEI January-February 2000

There are other factors that complicate the situation. Some components are UL Recognized Components while others are UL Listed. UL recognized components are suitable for use only in an overall listed end use product. These recognized components are not suitable for use as field-installed units. Other products may carry a CSA Certification which may differ [...]

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