This article was posted 08/13/2007 and is most likely outdated.

The Confusion Surrounding “Stray Voltage”
 

 

Topic - Grounding and Bonding
Subject - The Confusion Surrounding “Stray Voltage”

August 13, 2007
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The Confusion Surrounding “Stray Voltage”


 

ImageWhile “stray voltage” has been a concern for farm livestock for many years, it is only within the past few years that the term has been associated with human fatalities. The industry has seen an expansion of the term’s usage to describe events that some engineers feel is incorrect. This situation has resulted in costs to utilities exceeding many millions of dollars that has a questionable impact on customers increased safety.

 

The purpose of this paper is to discuss the confusion that now exists in the area of “stray voltage”. The paper will discuss the traditional definition of the term “stray voltage”, as well as the recent usage of the phrase to describe more dangerous conditions such as step-and-touch voltages, temporary overvoltages, contact voltages, etc. Finally, the paper will address the status of the industries response to this issue. It will discuss the measures taken by some utilities as well as the IEEE to establish some sort of industry guidelines to address these issues.

 

Click here to review this paper written by Jim Burke, InfraSource Inc., Fellow, IEEE

 

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Comments
  • I have watched this forum with intrest. I have been in this business for 33 years and I have never been ceased to be amazed at the level of paranioa and ignorance when it comes to this issue. I work for an electric cooperative where we value our member owners as partners in this electric business endeavor. Any member I speak with has the potential to be on the board of dirctors guiding the direction of the cooperative. Each member is my boss. We work very closely with our farm members when it comes to this issue. I can say with expeience that the vast majority of problems found are due to the wiring practices found on typical farms. We also have the priveledge of having a very experinced person at the local ag extension office who possesses great knowledge about stray voltage. The farmers typically call him first, when I recieve a call from him I know that we have a legitamate issue on our system. He will find all of the typical issues on the farm which contribute to stary voltage. Lack of grounding, unbalance loads, pinched and open wiring, outlet boxes filled with dust and debris (we measured 17 volts off of the whitewash on a barn beam due to this) wire laying on the floors with nicks and cuts and more. Our goal is to find the problem no matter where it is. We inspect our lines for neutral and ground connections and adjacent homes (bad water heater elements). We inspect phone and coax grounds. His involvement also is helpful in finding true stray voltage issues or if there are farm management problems. We have had many farmers spend tens of thousands of dollars on systems that "mitigate" stray voltage and still have production problems. When we have worked side by side with the farmer, ag extension office and qualified electricians, and still are not able to eliminate the problem, we install a neutral isolator as last resort. I resent being painted with the same paintbrush as some have done in this forum to say that utilities are evil and are not responsive to this issue. All of the other utility personell I am familiar with take this issue seriously and perform due diligence to abate this problem. The problem arises when some people think that all of these problems are due wholly to the utility and refuse to take responsbility for their part in finding and resolving the issue. As far as frequencies other than 60 Hz being discussed here I am at a loss as to how thiese are the responsibility of any utility. As I said before, there is a lot of ignorance surrounding this issue.

    Bob Joslin

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