148 (Grounding Conductor): Requires metallic junction boxes—and by extension, cabinet doors—to bond to ground using a designated grounding screw or clip. Your boss might insist on it, while your. First, panels must have a way to ground all metal components that could be contacted by a person (pretty much all of them). Any loose wire or faulty connection could cause an energized conductor to touch the box, and it must be able to trip the breaker under such circumstances (14. 4 states the general requirements for grounding and bonding of electrical systems for both grounded and ungrounded systems. For grounded systems, the NEC requires you to perform all of the following: electrical system grounding, electrical equipment grounding, electrical equipment. The distribution box should be installed in an area close to the power supply to reduce power loss and ensure safety. Avoid installing in a humid and corrosive environment to prevent equipment damage. Select a well-ventilated and dry place to avoid poor heat dissipation causing equipment. Does the National Electrical Code (NEC) require a 480-volt (V), three-phase, 3-wire, delta-connected system to be grounded? No, it is optional.
