![]() Establishes a stable voltage to ground during operation, including short circuits.Bonds electrical equipment together to establish a low impedance path (effective ground-fault current path) from the fault location back to supply source to facilitate the operation of overcurrent devices.Limits unintended voltage on the electrical system imposed by lightning, line surges or unintentional contact with higher-voltage lines.Keeps equipment enclosures and other normal metal parts stable and therefore, safe to touch.These practices perform the following functions: Grounding and bonding practices are important and required per NEC because when done properly, it will protect personnel from electrical shock hazards and ensure electrical system operation. The intent of this article is to discuss the requirements of solidly grounded, alternating current electrical systems less than 1,000 volts.įigure 1: The illustration of grounding systems shows connection from utility to load. Grounding and bonding requirementsĪrticle 250 is a complex portion of the NEC and covers many different types of systems: grounded systems (less than 50 volts, 50 to 1,000 volts and greater than 1,000 volts), ungrounded systems, systems greater than 1,000 volts, impedance grounded neutral systems, direct current systems, separately derived systems and grounding of instrument and meters/relays. Some terms and requirements discussed may be true for the European standards, however, the intent of this article is to clarify grounding and bonding design seen in the United States. NFPA 70: National Electrical Code Article 250 covers the minimum requirements for grounding and bonding and, although the NEC lists requirements to abide by, it should not be taken as a design manual. There are two main reasons for understanding grounding and applying the correct design for grounding and bonding: safety and correct operation of sensitive electronic equipment. Prevent common grounding and bonding design and construction errors.Įlectrical grounding and bonding is one of the many misunderstood topics of discussion in the design and construction industry.Understand National Electrical Code grounding and bonding requirements for solidly grounded alternating current low-voltage systems (below 1,000 volts). ![]() ![]() Learn the proper electrical grounding terminologies.Understanding correct grounding and bonding design and construction is crucial for proper electrical system operation and personnel safety ![]()
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