Grounding

In prior iP articles we have discussed effective methods of applying personal protective grounding to both overhead and underground electric utility systems. Proper application of the equipotential grounding method will ensure worker protection during an accidental re-energization or backfeed of the electric utility system. But what does your personal protective grounding practice do to reduce the hazards of induction? Is it possible your personal protective grounding practice is actually increasing the effects of induction? Let’s look at what we call induction, or what electrical engineers refer to as electric field induction and magnetic field induction.

This article is a continuation of the discussion published in the August 2011 issue of Incident Prevention, which covered personal protective grounding of overhead distribution and transmission systems. As with overhead grounding, there are three industry-accepted work methods that allow qualified employees to work with de-energized underground distribution cables and equipment. They are:
• Insulation
• Isolation
• Personal protective grounding, also known as equipotential grounding or EPZ

Personal protective grounding of overhead distribution and transmission lines and equipment is one of three industry-accepted work methods that allow qualified employees to work with de-energized lines and equipment. The other two methods are insulation and isolation. Following are descriptions of all three.

Looking for an alternative to ground-to-ground and cradle-to-cradle? The method suggested here could be your answer.

Georgia Power Company (GPC) has developed the 4 Cover-up Rules philosophy to train employees rather than requiring a ground-to-ground or cradle-to-cradle glove and/or sleeve rule.

The pros and cons of single-point equipotential grounding, as opposed to working between your grounds or bracket grounding, has generated a lot of discussion. As found in IEEE-1048 Guide for Protective Grounding of Power Lines, single-point equipotential grounding is becoming more simply and accurately referred to as worksite grounding.