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Equipotential Bonding in and Around Swimming Pools, Article 680 NEC®
http://necconnect.org/wp-content/uploads/sites/2/2014/05/70RR-01-PDF.pdf
A person who is immersed in a pool or who is dripping wet has a large amount of exposed skin, and if lying or walking on a concrete deck or other conductive perimeter surface, is extremely vulnerable to any differences in electrical potential that might be present in the pool area. Creating an electrically safe environment in and around permanently installed swimming pools requires the installation of a bonding system with the sole function of establishing equal electrical potential (voltage) in the vicinity of the swimming pool.