Because a human body can conduct electricity, if there is a difference in the potential voltage of elements near the pool and the water, the electricity could pass through the human, causing a lethal shock. In order to safeguard this from happening, a grid of rebar and connective bonding jumpers bond the elements together. If these components are correctly bonded, there is no difference in the potential voltage of the various components, so there is no impetus for the electricity to travel through a conductor, such as a human body. Without taking these steps, elements like the metal housing around a pool light can prove a lethal addition to a pool instead of an amenity.