Can any one tell me when we need to be concerned with the resistance to ground (earth) of a grounding electrode system in an industrial or commercial installation with system(s) operating less than 600 volts? It appears that the NEC is not concerned with it, however, it requires to connect the electrical system to ground with a specified grounding electrode conductor size as appropriate for the electrical service. The NEC goes on to say that you connect to earth in order to protect against lightning, line surges or accidental contact with the higher voltage as well as providing equal potential. With that said, the code is not concerned with the earth ground) resistance of the electrical system as it may be the industry as well as IEEE standards (80 and 81) practice for high voltage systems in substations. Any feed back on this topic is appreciated.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
ENGINEERING.com surveyed 364 product development professionals to glean insights into how their teams are performing today, and what technologies are most useful to support their processes. Download Now
3D printing has quickly expanded beyond the realm of prototyping and into the world of end part manufacturing. Desktop 3D printers need not be used for making parts themselves, but as a secondary process for producing tools. Download Now
Creating tooling for injection molding is an expensive and complex proposition. Until recently, the only way to avoid tooling defects causing air traps, voids, shrinkage and the like was to employ a time-consuming and tedious physical prototyping process. Download Now