In many cases, a line worker is faced with several daily tasks which require them to use a single-point-of-contact voltage detector. With a variety of options on the market, knowing which type to use for a project can be challenging. Hubbell Power Systems' CHANCE® Tools brand offers a wide variety of voltage detectors. When using a voltage detector, it is critical to always use a proper length hotstick that complies with company and OSHA-mandated minimum approach distances (MAD). Rubber insulating gloves should never be used as the only form of PPE when using a voltage detector.
What is Step and Touch Potential?
While performing energized or de-energized line work, there are many opportunities for a line worker to encounter differences in electrical potential. Opportunities could include working near bucket trucks, underground gear, overhead switches, or in substations. When a difference in potential occurs across a worker’s body, current begins to flow. This current flow can be very hazardous as it only takes 50 to 60mA to become possibly lethal. These differences in potential can be categorized as step and touch potential. Step potential is defined as a difference in electrical potential between a worker’s feet and touch potential can be between a worker’s hands or hands and feet.
Hard Plastic vs. Rubber Cover-Up Equipment
Deciding which cover-up equipment is best for the job depends on several factors, including the system voltage, types of energized equipment, and work methods (rubber gloving vs. hotsticking).
A common cause of power quality issues in underground systems is the improper torquing of underground separable connectors. During the installation of these products, achieving proper connections is one of the most important yet overlooked step in the installation process.
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:
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).
Distribution lines can face harsh conditions. If standard products aren’t doing the job and you need more protection for your standoff brackets and guy strains, look no further. Here are four reasons to switch to silicone-coated fiberglass construction products:
It’s a bittersweet moment to look back on an event like the 36th Annual International Lineman’s Rodeo & Expo and to realize that for all the preparation and hard work, the event is done. The best linemen in the world brought their best to compete, and, for the rest of us, we watched and admired their skill, speed, and strength.
CHANCE® meters are used to detect line voltage, determine approximate phase-to-phase-voltage, check DC resistance in protective grounding sets, determine in-or-out of phase relationships, monitor leakage currents, and advise the operating condition of CHANCE hot sticks. Calibration of these meters is important in confirming their accuracy in the field and ultimately in helping to protect line personnel.
Incorrect meter readings could result in undetected or misread voltages that could be harmful to equipment and personnel.
Fiberglass Guy Strains may be installed anywhere along the guy wire to help protect against stray current that may be on the guy caused by lightning strikes or other sources. These fiberglass units serve as a replacement for porcelain insulators or johnny balls, and they extend the insulation length. They offer numerous advantages, including:
- variable lengths
- easy terminations
- resistance to fracture caused by brittleness