1) Electrical System grounding: Electrical systems that are grounded shall be connected to earrth in a manner that will limit the voltage imposed by lightning, line surges, or iunintentional contact with higher voltage lines and that will stabilize the voltage to earth during normal operation.
FPN: An important consideration for limiting the imposed voltage is the routing of bonding and grounding connectors so that they are not any longer than necessary to complete the connection without disturbing the permanent parts of the installation and so that unnecessary bends and loops are avoided.
2) Grounding of Electrical Equipment: Normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected to earth so as to limit the voltage to ground on these materials.
3) Bonding of electrically Conductive Materials and Other Equipment. Normally non-current-carrying electrically conductive materials that are likely to become energized shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.
(5) Effective Ground- Fault Current Path. Electrical equipment and wiring and other electrically conductive material likely to become energized shall be installed in a manner that creates a low-impedance circuit facilitating the operation of the overccurrent device or ground detector for high-impedance grounded systems. It shall be capable of safely carrying the maximum ground-fault current likley to be imposed on it from any point in the wiring system where a ground fault may occur to the electrical supply source. The earth shall not be considered as an effective ground-fault current path.