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.
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.
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.