No more squinting to read the voltage from the end of the hot stick – or relaying information to the crew on the ground. The new CHANCE® Transmission Multi-Range Voltage Indicator® (TMRVI), lets your entire team accurately monitor transmission voltages on a mobile device or Apple Watch using the free MRVI app with an easy-to-read interface.
Topics: Lineman Grade Tools
There are three distribution arrester types commonly used to protect overhead distribution equipment from the damaging effects of overvoltage. IEEE C62.11 defines Normal Duty (ND) and Heavy Duty (HD) classes by their ability to withstand certain current impulse levels. The third, Heavy Duty Riser is a type, or variation, of the HD classification and utilizes a larger diameter Metal Oxide Varistor (MOV) disc.
- Once all safety concerns have been addressed, attach the Kelly bar adapter and installing tool assembly to the Kelly bar on the installing truck.
As with most mechanical devices, CHANCE® anchor-installing tools periodically require maintenance checks to ensure peak performance.
When comparing different arrester designs, it is important to understand how the arrester was built to correctly evaluate the amount of protection it will provide. The IEEE C62.11 standard covers two types of Metal Oxide Varistor (MOV) distribution arresters that are available today, internally gapped and gapless. These arresters might look identical from the outside, but the different internal module design affects how the arrester protects voltage sensitive equipment.
- Choose anchor site carefully. Rock anchors will only perform effectively in solid competent rock (Class 0 Soil).
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.
Topics: Lineman Grade Tools
When considering an underground enclosure specifics matters. It is important to take load ratings into consideration. For confidence in selecting the right load ratings it is recommended to choose out of the two verified ratings, the ANSI/SCTE77 or the AASHTO H20. When determining the best load rating consider the enclosures intended use.
The ANSI rating is best for non-deliberate traffic areas. These enclosures are placed where direct wheel impact is not likely or anywhere that traffic is not intended. The area may include grassy areas, sidewalks, highway berms, light pole bases, highway median strips and parking lots. These enclosures are designed to handle only occasional, non-intentional traffic.
This load rating is intended for direct traffic areas, such as highway or roadway lanes, intersections and parking lots. These enclosures are situated directly in a wheel path and are designed for anywhere that traffic will directly impact the enclosure.
If you have questions about ANSI-SCTE or any other applications for enclosures, please call your Hubbell representative. We'd be happy to work with you in specifying your underground enclosure applications.
KNOWING THE DIFFERENCE
It pays to know the difference between the two enclosure ratings. AASHTO H20 rated enclosures come with a heftier price tag due to their heavy duty design. AASHTO enclosure covers are made from unique material, such as cast iron, in order to handle continuous heavy loading. It is advantageous to know the specific rating needed for your job in order to avoid unneeded substantially high prices and to ensure enclosure longevity.