Understanding Classes and Types of Rubber Insulating Blankets

Posted by Joseph Cardona on May 26, 2020 8:00:00 AM

Insulating rubber blankets for energized line maintenance come in a variety of sizes, classes and types. Each Class of insulating blankets has its own maximum use and testing voltages, as described in ASTM D1048 (see Table 1). The higher the class rating, the higher maximum the voltage rating is for the insulating blanket. 

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Topics: Lineman Grade Tools, CHANCE Products

CHANCE® Lineman Grade Tools™ Additional Cleaning to Help Prevent the Spread of COVID-19

Posted by Jeff Kopp on Apr 6, 2020 9:19:47 AM

During this time of heightened concern for cleanliness, here are some guidelines for additional cleaning of your CHANCE tools, without compromising the integrity of the equipment. It is recommended that you continue to follow safe working practices, increased hygiene, and proper distancing as indicated by the Centers for Disease Control and Prevention (CDC), OSHA, federal, state and local health departments, and your company’s work practices and procedures. 

Enhanced Cleaning Instructions*
Fiberglass Hotsticks, Instruments, Meters, Rubber and Plastic Cover-Up, Rubber Blankets, and Cable Jacket:

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Topics: Hot Line Tools, Lineman Grade Tools, Safety

Why Use “H” Rated Clamps for Temporary Grounding

Posted by Billy Webber on Feb 28, 2020 10:42:09 AM

Prior to 2009, ASTM F855, Standard Specifications for Temporary Protective Grounds to Be Used on De-energized Electric Power Lines and Equipment only included one table indicating the specifics to which ground set designs were to be tested. This “Table 1” was based on a near symmetrical current, limiting the circuit inductive reactance to resistance (X/R) ratio to a maximum of approximately 1.8 (20% asymmetry).

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Topics: Lineman Grade Tools, Safety, Temporary Grounding

5 Steps Toward Keeping Cover-Up Like New

Posted by Joseph Cardona on Jul 2, 2019 2:45:33 PM

Download the Cover-up Care Guide

Here are five ways linemen can ensure their temporary protective cover-up equipment continues to function safely and for as long as possible:

  1. Take a close look every day

Don’t assume a cover is ready to use. Cover up may look fine at a glance, but it’s worth looking a little closer. Stretch out your rubber covers with a rolling or peeling action and look for cracks, scratches, moisture, or other defects. If you find something concerning, remove it from service and tag it to be tested or discarded.  Check the inside and outside surfaces as some defects may be hiding inside.

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Topics: Lineman Grade Tools

13 Steps to Replace an Insulator on a Tangent Structure

Posted by John Delsman on Jan 14, 2019 10:48:00 AM

The safety procedures described below are the basic steps and necessary equipment linemen will employ when replacing an insulator from an aerial lift truck on a tangent structure with rubber gloves.

  1. A hold-off is recommended on the line to ensure the line is locked out after an automatic protection operation.
  2. A tailboard briefing is held with all workers before the work starts to ensure all procedures are understood.  Proper safety precautions should be observed. Each person should know specifically what they are required to do. All workers should 
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Topics: Lineman Grade Tools

Cleaning & Inspecting Your Gloves in the Field

Posted by Joseph Cardona on Oct 24, 2018 3:26:00 PM

Properly inspecting and storing your rubber insulating gloves could save your life. Rubber insulating gloves are the first line of defense against electric shock. ASTM F496 requires that rubber insulating gloves be inspected and electrically tested at a maximum interval of every six months, whereas field inspection is necessary prior to each use. The date code on the rubber insulating gloves should be checked to verify the most recent testing of gloves is still valid.

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Topics: Lineman Grade Tools, rubber gloves

The Life Expectancy of a Hotstick

Posted by Jason Dettmar on Oct 9, 2018 2:35:00 PM

Linemen often ask about the life expectancy of a hotstick. While there is no exact answer to this question, it can range anywhere from hours or days for a hotstick that is abused and damaged, to years or decades for a hot stick that is well cared for and maintained. While the hours or days is hopefully the exception, on occasion a hotstick does come back to the factory with tire tread marks on it or with damage that clearly indicates it was dropped from some height, probably around the height of the primary on a wood pole.  While an “accident” can cut the life of a hot stick short, there are a number of steps in the care and maintenance of a hot stick that can result in many years or even decades of service and protection for the linemen using them. 

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Topics: Lineman Grade Tools

When Milliohms Matter – Temporary Protective Grounding

Posted by Jason Dettmar on Aug 13, 2018 11:02:00 AM

In the event of a fault current, milliohms can make the difference between a lineman going home for the day or being seriously injured or killed.  With fault currents in the tens of thousands of amps or more, the parallel path to the lineman needs a resistance so low that milliohms do make a difference. 

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Topics: Lineman Grade Tools, Temporary Grounding

Protection from Hazardous Step and Touch Potentials

Posted by Billy Webber on Jul 18, 2018 3:48:20 PM

When overhead electrical line workers employ proper personal protective grounding practices they are usually protected from electrical hazards that might arise from working on de-energized lines and equipment. But, what about workers at ground level? How are they protected, and from what kinds of situations are they protecting? The answer is from hazardous differences in step and touch potentials.

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Topics: Lineman Grade Tools, Temporary Grounding

Understanding Aqueous Dipping for Rubber Insulating Gloves

Posted by Joseph Cardona on Jun 5, 2018 11:12:00 AM

There are different methods to produce rubber insulating gloves. Hubbell Power Systems’ CHANCE® Lineman Grade™ gloves are produced using an environmentally responsible aqueous dipping process. 

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Topics: Lineman Grade Tools, rubber gloves