Photovoltaic power system designers and installers have a wide range of utility-grade, industrial, commercial, and special purpose cables, over-current devices, disconnects, power conditionners, modules, and other optional equipment to choose from in the design and installation of electrically safe systems. The selection and application of the available equipment is not generally covered in existing standards. This guide will suggest good engineering safety practices for PV system design, equipment selection, and hardware installation.