Attach a ground wire from one of the threaded studs (A) at the bottom of the housing, to the mounting plate (B). The ground resistance between all system parts shall be <. This Guide designates the practices that should be followed by the member firms of the Infrastructure Health & Safety Association (IHSA) when involved in de-energizing isolated electrical circuits or apparatus. This Guide is not designed as a training manual, but contains information, best. There are several factors that make substation grounding absolutely necessary. The NEC requires that where any or all of these electrodes occur on the jobsite, they m st all be bonded. Whether you're a seasoned pro or just starting out, this comprehensive guide will give you practical insights into proper grounding techniques, with a special focus on how selecting quality materials from a reliable building material supplier impacts your entire system's safety and longevity. Next, we describe directional elements suitable to provide ground fault protection in solidly- and low-impedance grounded distribution systems. We then analyze the behavior of ungrounded systems under ground fault conditions and introduce a new ground directional element for these systems. Each DISTRIBUTION BOX and controller must be grounded.
