Before & After Grounding
A simple demonstration using a multimeter can show how grounding connects the body to the Earth.
When measuring body voltage indoors before grounding, the meter may show a small voltage reading. This occurs because modern homes contain many electrical devices and wiring that create electric fields.
When the grounding mat is connected, and the person touches it, the measured voltage typically drops significantly.
This demonstration shows how grounding connects the body to the Earth through the grounding system of the home.