Which method is valid for testing if a line is dead before installing protective grounds?

Using a rated and calibrated high voltage volt meter is a valid method for testing if a line is dead before installing protective grounds. This type of equipment is specifically designed to measure high voltage levels and can provide accurate readings of whether there is electrical current present in the line. By ensuring that the equipment is properly calibrated, linemen can trust the results, thereby enhancing safety protocols before proceeding with any work on the line.

In contrast, while a low voltage meter may be useful for lower voltage applications, it is not suitable for testing high voltage lines where significant danger is present. Visual inspections alone do not provide definitive proof that a line is de-energized, as they cannot detect hidden electrical voltage or current. The fuzzing method, which involves lightly touching the line with an insulated tool to feel for vibrations or disturbances, also lacks reliability and can put workers at risk. Therefore, using a rated and calibrated high voltage volt meter ensures a safer and more accurate assessment of the line’s electrical state.