The intent of this guide is to provide guidance and information pertinent to the grounding practices in WPP collector system for personal safety. The specific purpose of this guide is as follows: — Identify differences between substation grounding (covered under IEEE Std 80™) and WPP collector system grounding. — Establish, as a basis for design, safety limits of potential differences that can exist in a WPP collection system under fault conditions between points that can be contacted by the human body. — Review WPP grounding practices with reference to safety criteria for the design, and provide a procedure for the design of practical grounding systems based on these criteria. — Develop analytical methods as an aid in the understanding and solution of typical voltage gradient problems within a WPP. This guide is primarily concerned with grounding practices within WPPs for 50 Hz or 60 Hz systems. DC systems are beyond the scope of this guide. A grounding system designed as described herein does, nonetheless, provide some degree of protection against steep wave front surges (such as lightning) entering the wind turbine generator (WTG) and passing to earth through its grounding system electrodes