Why should the test leads of a megger never be touched while in use?

The reason the test leads of a megger should never be touched while in use relates to safety concerns associated with the generator voltage present on the test leads. Meggers, or insulation resistance testers, operate by applying a high-voltage test to the insulation of electrical systems to determine their integrity. When the megger is active, it generates a significant voltage that is output through the test leads to the insulation being tested.

Touching these leads while the megger is in operation could result in electrical shock, as the voltage on the leads poses a direct risk to anyone who comes in contact with them. This potential for serious injury is the primary concern, highlighting the importance of maintaining a safe distance while the device is performing its tests.

Understanding this principle reinforces the importance of proper safety protocols and handling procedures for high-voltage testing equipment. While it is also important to consider factors such as potential heat generated by the leads or the validity of the test when leads are disturbed, it is the presence of high voltage that poses the most immediate danger.