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A Cable Too Long

Q: I am currently reviewing a URD circuit with a cable segment that is 6,200′ per our one-line and GIS. It is our regular #2 db [direct buried] cable. I am considering the installation of pull-boxes to break up the many long segments prior to attempting injection. What is the practical limit to TDR [time-domain reflectometer] testing? What is the practical injection limit? I assume in the best case that there at least a construction splice every 2000 feet, but there may be more that have to be replaced.

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Merry Masters

Merry Masters Q: It was a pleasure corresponding with you this year, toward a better understanding of cable rejuvenation. I also appreciate all the material you provided regarding cable testing. I wanted to take this opportunity to personally wish you and your adoptive family a Merry Christmas and a healthy and happy New Year.  …

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Wet, Wetter and Wettest

Wet, Wetter and Wettest Q: I have two areas under consideration for rejuvenation next year. The first is a sub-division with 40 year-old cable that is in relatively dry sandy soil. The second sub-division has 15-20 year-old cable that is in very wet, swampy soil. All other things being equal, which area would enjoy the…

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Flash Point Matters

Q: Why is the flash point of a rejuvenation fluid relevant? The temperature of an electrical arc is 35,000°F. And everything is flammable from the utility standpoint, just as nothing is unbreakable from a lineman’s viewpoint.

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Galvanic Corrosion of Neutrals

Galvanic Corrosion of Neutrals Q: My copper neutrals look green. Could our practice of bonding neutrals to the rebar in our vault structures lead to neutral corrosion?   A: Yes, copper carbonate does have a bluish-green hue, but copper carbonate is your friend. The copper carbonate patina protects the native copper underneath from corrosion. It’s…

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Methanol

Q: In Section 16 of the material safety data sheet (MSDS) for Cablecure iXL fluid it states that methanol is listed as a Hazardous Air Pollutant (HAP). Given your green credentials it is hard to believe that you would create any significant air pollution.

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Dielectric IV

Dielectric IV In Dielectric I, I provided the first part of a four-part answer to a query—the summary question: To what extent does the introduction of injection equipment into energized devices impact the safe operation of medium-voltage circuits? We learned that there are great differences in the extent of this risk depending upon the injection…

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Dielectric III

Dielectric III In Dielectric I, I provided the first part of a four-part answer to eight questions. The eight questions can be summarized: To what extent does the introduction of injection equipment into energized devices impact the safe operation of medium voltage circuits? We learned in the first installment that there are great differences in…

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Dielectric II

Dielectric II In Dielectric I, I provided the first part of a four-part answer to a query—the summary question: To what extent does the introduction of injection equipment into energized devices impact the safe operation of medium-voltage circuits? We learned that there are great differences in the extent of this risk depending upon the injection…

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