The torque-to-capacity relationship for helical anchors and piles is an empirical method originally developed by the A. B. CHANCE Company beginning in the late 1950s. Today, the relationship is well recognized in the deep foundation industry. It is commonly referred to as torque correlation.
With the recent and upcoming revisions of IEEE C62.11 and IEC 60099-4 surge arrester standards, writing a technical specification for arresters can be challenging for both new and experienced engineers. Most arrester manufacturers have a dedicated team of engineers who are familiar with the evolving standards and can support the revision and/or creation of arrester specifications.
Not sure what the proper bushing replacements are for your in-service bushings? Hubbell | PCORE® Electric can provide a custom cross-reference guide to help!
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.
Predicting the holding capacity of an anchor can be difficult due to soil variations at different depths and different structure sites. It is critical to understand anchor capacity to ensure the integrity of your guyed structures.
The reliability of our overhead power and communication lines is as important today as ever before. The integrity of overhead construction often relies on guy anchor systems that can be trusted when put to the test during high wind loading situations and when tree branches come into contact with the lines. If an anchor pulls even the slightest amount, it causes the top of the pole to lean. This can cause improper line sag resulting in clearance issues.
Repairing a bushing is less expensive than purchasing a new bushing and you are able to maintain all of the original dimensions.
A typical bushing repair is a regasket of the bushing or a recore and regasket of the bushing. When a bushing leaks; however, tests well, a regasket will be performed in which the sealing components are replaced. When a bushing tests poor, a recore and regasket will be performed. During the recore of a bushing the bushing core will be replaced with a new PCORE® POC type core. Repaired bushings ship with the same warranty as a new bushing.
Looking at recent data from California utilities, about one in ten ignition causes can be traced back to animals either directly or indirectly. That amounts to a significant number of wildfires caused by animal contact alone.
Here are five ways wildlife can cause fires near power lines.
Utilities recognize that wooden poles are vulnerable to fire. However, replacing millions of wooden poles with metal or composite ones isn’t realistic from a cost and labor perspective. Reinforcing wooden poles with passive fire protection options is a promising alternative. To maintain the benefits of wood poles, utilities are choosing to deploy passive fire protection solutions in high risk fire areas, controlled burn zones, and active fire paths. This can reduce the duration and cost associated with power outages after a fire. There are two leading options for protecting wooden poles from wildfires: coatings and wraps. These products offer different benefits in terms of serviceability, ease of installation and removal, and breathability.
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.