In the electric power distribution industry, a hot stick is an insulated pole, usually made of fiberglass. When engaged for live-line working it is used by electric utility workers to protect them from electric shock on energized high-voltage electric power lines.[1] Depending on the tool attached to the end of the hot stick, it is possible to test for voltage, tighten nuts and bolts, and apply tie wires.[2] These tie wires (twisted lengths of ductile wire that fasten the running cable to its supporting insulators), open and close switches, replace fuses, lay insulating sleeves on wires, and perform various other tasks while limiting exposure to electric shock to the crew.[3] By allowing workers to perform tasks from a distance, hot sticks reduce the need for direct contact with energized components, significantly lowing the risk of electrical injuries or fatalities. Their insulating material prevents the flow of electricity through the tool, creating a protective barrier between the worker and the high-voltage source.
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Hot sticks are made in different lengths, from simple 3-foot (1 m) sticks to 30-foot (9 m) telescoping models. Because the fiberglass provides electrical insulation, the hot stick allows utility workers to perform operations on power lines safely without de-energizing them or while the state of the power line is not yet known. This is essential because certain operations (such as opening or closing combination fuse/switches) must occasionally be performed on an energized line. A Fuse cutout is a crucial protective device that is used in electrical distribution system (overhead power lines). This cutout is to interrupt power flow when a fault has occurred, In order to use these fuse cutout the hot stick is used to safely open or close these.[4] Additionally, after a fault occurs, the exact state of a line may not be certain; in this case, for reasons of crew safety, the utility workers must treat the line as though it were energized until it can be proven that it is not and safety ground cables can be applied to the line (so that the line is guaranteed to remain grounded/earthed while maintenance is performed upon it). If power tools are fitted to the end of the hot stick, they are usually powered hydraulically rather than electrically because, like the fiberglass of the hot stick, the hydraulic fluid is also a good insulator. The hydraulic power is commonly supplied from the bucket truck (cherry picker or aerial work platform) supporting the workers.
The hot stick not only electrically insulates the worker from the energized conductor, it also provides physical separation from the device being operated, to reduce the chances of burns which might result from electrical arcing if there is a malfunction of the device being operated.[5]
Many other countries outside of the United States also use hot sticks, wherever live-line maintenance is practiced on high voltage systems. The concept remains the same keeping the utility workers safe while working on the energized lines.[6] Canada most closely uses hot sticks with the exception of following CSA (Canadian Standards Association) which mirrors OSHA and ASTM standards. In Australia and New Zealand, hot sticks are essential for maintaining power lines across vast and remote areas, with strong safety protocols in place.[7] European countries use hot sticks primarily for transmission level work or emergencies, as much of the distribution level work is done on de-energized lines. In Japan, hot sticks are used alongside advanced technologies like robotic arms and drones to further minimize human risk.[8] In developing countries and parts of Africa, the availability and usage of hot sticks vary, but they remain an important safety tool where live-line work is practiced. Overall, hot sticks are a critical part of global electrical safety practices, adapted to meet the unique needs and infrastructure of each region.
In the United States, ASTM Standard F 711 specifies the stringent requirements for hot sticks, and U.S. OSHA standards require that they be inspected and electrically tested every two years.[3] The ASTM F 711 stands as a pivotal standard crucial for defining the rigorous criteria governing the design, materials, and performance specifications of electrically insulating hot sticks. This standard plays a vital role in guaranteeing uniform levels of electrical insulation, mechanical robustness, and resilience against environmental stressors. Such factors encompass moisture ingress, fluctuating temperatures, and the physical wear and tear endured during field operations. By adhering to ASTM F 711, manufacturers ensure that hot sticks consistently meet these stringent requirements, thereby enhancing both safety and operational reliability in diverse industrial settings.[9]
In in Atlanta, Georgia, a tool that was known as an "electrical hook" was introduced. "This was essentially a spring-type clamp for tapping energized circuits. The electrical hook necessitated a hot stick for installation purposes, and its use suggested additional tools which were soon developed for grounding and jumper service, applying parallel groove clamps, handling conductors, pulling cotter pins, and manipulating tie wires. There soon followed a hack saw, a hotline come-along, and saddles which could be attached to poles for supporting certain tools".[10] The first accepted hot line tools were rated for 34 kV but many linemen were hesitant to use the hot stick in such operations with this high voltage. With fear from workers hot line maintenance was restricted to 22 kV, and less. Linemen later began to realize that using hotline tools kept them at a safe distance from lines that were energized and slowly began to lose their fear of hotline work. Years later "restrictions were gradually relaxed until when several companies began permitting hotline operations to be performed on 66 kV lines. This soon rose to 110 kV until in the late Thirties the astonishing news was circulated that a West Coastline of 220 kV had been successfully worked "hot".[10]
In March a milestone was passed "when O.G. Anderson and M.R. Parkin, Hot Line Tool Specialists of the A.B. Chance Company, changed suspension insulators on the 287 kV Hoover Dam, Los Angeles Line, using tools specially designed for the job. The A.B. Chance Company is now () building tools that will successfully handle the 345 kv lines, presently under construction. At the present time, there are few jobs that cannot be performed hot, and about the only limitation to this type of work results from the type of construction employed."[10]
Early hot sticks were made from wood and needed to be lightweight to prevent fatigue on linemen. Sitka spruce is the most popular wood used in the construction of hot sticks due to its light weight, strength, and excellent electrical properties. Picea sitchensis is the scientific name for the tree that the Sitka spruce came from. Mostly in Northwestern North America this type of wood was used for hot sticks due to is outstanding stiffness to weight ratio.[11] Hot sticks are now generally made from high-strength plastics with an aluminum alloy head. This makes for an even lighter hot stick. "Insulation characteristics and strength of the tools are of major importance, as the linemen's safety depends upon these things. The ease with which the tool handles, the relief from fatigue, the manner in which it operates when engaging a tie wire, strain clamp insulator, or conductor are also important considerations."[10]
At Burlington Safety Laboratory, we’re committed to safety and thoroughly testing equipment so it offers the best possible degree of protection. Peter Senin, Burlington’s late president, helped lead the charge in creating safety guidelines used by the National Association of Independent Laboratories for Protective Equipment Testing (NAIL for PET), and we’ve been creating testing procedures that uphold the same mission for over 40 years.
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Our testing processes meet or exceed the standards of ASTM, ANSI, OSHA, and NIST, and we test a wide range of safety equipment to ensure compliance. Learn more about the role of high-voltage hot sticks in maintaining a safe work environment.
Line technicians use hot sticks while near energized equipment and power lines to avoid making contact with or going too near to live electricity sources. High-voltage electricity sources are extremely hazardous for operators and repair technicians. Not only can direct contact be dangerous or even fatal, but the electricity can cause arc flashes: transfers of electricity through the air toward the ground, endangering people within range.
The sticks themselves are fiberglass rods at least four feet long with fixtures at the end that can press switches and manipulate parts. Technicians hold the handle of the stick to reach and maneuver parts on the other end. Because fiberglass does not conduct electricity, these tools keep workers safe from electricity. The four-foot length also ensures enough clearance to mitigate the risk of arcing and shock by keeping workers and their hands out of the arc zone.
Manufacturers produce a wide range of hot sticks of different lengths, materials, and attachments to help line technicians complete repairs and maintenance on high-voltage equipment or systems. They fit into two broad categories: telescoping hot sticks and shotgun hot sticks.
Telescoping hot sticks are extendable tools. They feature several hollow tubes of successively larger diameters so they fit neatly inside each other and then extend the total length of the hot stick. Technicians can extend one, several, or all of the sections based on the distance between themselves and the surface that needs to be reached. This versatile design allows technicians to reach electrical equipment at different heights without having to use a large collection of separate tools.
Shotgun hot sticks help line technicians easily reach, remove, and install components. Rather than having separate sections that operators extend manually, shotgun hot sticks have a sliding mechanism to increase the length of the stick. Operators can attach the far end of the stick to a disconnect ring, pull the trigger at the other end, and elongate the stick. Once the stick is the right length, the operator can disengage the trigger and use the stick.
Operators and technicians should use a hot stick whenever working on or near live electricity. By using the sticks instead of directly touching the equipment, workers stay isolated against the risk of electrical shocks. Because the hot sticks are long, they also isolate workers by keeping them out of the arc zone. Hot sticks should be used whenever there is a risk of electric shock, blasts, and arcing; specific circumstances include:
Technicians can use these sticks to directly manipulate cables, fuses, and other components. For example, line technicians can use a hot stick to hook terminated cable ends inside a transformer to “unplug” the cable or temporarily disconnect it. Then they can use the tool to reconnect it after completing repairs. Line technicians can also use hot sticks to position a fuse back into place after an outage.
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