ABSTRACT
System grounding is connecting a current-carrying conductor to ground potential at one place in a system. System grounding is done by electrically connecting a current-carrying conductor to earth via bonding neutral to ground in a single place. The grounded conductor is generally colored white for grounded systems. Many old-style stand-alone systems, as well as some more modern stand-alone systems, are solidly grounded. Many dc photovoltaic (PV) systems are also solidly grounded. In any electrical system, more than one point of system grounding is called a ground fault. If there were two points of system grounding, then there would be a parallel pathway for current to flow along the grounding system or through equipment. Grounded metal supports are support structures that PV modules are mounted on that are already connected to ground by any means permitted in Article 250.
