This guide addresses the design@ equipment applicability@ and hardware installation of electrically safe@ stand-alone@ and grid-connected PV power systems operating at less than 50 kW output. It discusses storage batteries and other generating equipment only in brief. This guide is PV-specific and is based on good engineering practices speci?c to the U.S. Purpose The purpose of this guide is to describe PV-specific topics or components relating to the design and installation of PV power systems that affect safety and to suggest good engineering safety practices for PV electrical balance of system design@ equipment selection@ and hardware installation. The areas to be emphasized are those PV-unique electrical power areas that would be of value to a team consisting of a PV engineer working with an electrical contractor@ or a person with significant experience in both areas.