2023 NEC Grounding & Bonding Course | Article 250 Explained

Unit 1. General Objectives After studying this unit, the reader will be able to explain the “performance requirements” of Article 250. explain how the “performance requirements” in NEC 250.4 relate to the “prescriptive requirements” in the remainder of Article 250. explain the meaning of objectionable current over grounding conductors. explain proper connections of grounding and bonding equipment. explain the importance of providing clean surfaces for grounding and bonding connections.

After studying this unit, the reader will be able to identify systems that are required to be grounded, those that are permitted but not required to be grounded, and those circuits that are not permitted to be grounded. summarize grounding requirements for grounded systems. explain how to size and install grounded service and separately derived ac system grounded conductors. identify separately derived ac system conductors that are required to be grounded. explain the function and sizing of main and system bonding jumpers. summarize grounding requirements for separately derived systems. explain requirements for grounding two or more buildings supplied by a feeder or branch circuit. summarize requirements for grounding portable and vehicle-mounted generators. summarize requirements for impedance-grounded systems.

UNIT 3. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR

After studying this unit, the reader will be able to summarize grounding and bonding requirements for service raceways and enclosures. summarize grounding and bonding requirements for other conductor enclosures and raceways.

After studying this unit, the reader will be able to summarize general requirements for bonding. explain bonding requirements for services. detail bonding requirements for other enclosures. explain bonding requirements for equipment if the voltage at the equipment is over 250 volts. summarize requirements for bonding loosely jointed metal raceways. explain bonding in hazardous locations. summarize material for, attachment of, and sizing equipment bonding jumpers. explain bonding of metal piping systems and exposed structural steel. determine bonding of lightning protection systems.

After studying this unit, the reader will be able to explain requirements for equipment fastened-in-place or connected by permanent wiring methods that is required to be connected to an equipment grounding conductor. identify equipment that is connected by cord-and-plug that is required to be grounded. identify types of acceptable equipment grounding conductors. understand identification requirements for equipment grounding conductors. summarize installation requirements for equipment grounding conductors. explain the minimum size of equipment grounding conductors. summarize the rules for continuity of equipment grounding conductors. explain the means of identification of wiring device terminals.

After studying this unit, the reader will be able to explain equipment grounding conductor connections. explain methods permitted for non-grounding receptacle replacement and branch-circuit extensions. explain rules for equipment fastened-in-place or connected by permanent wiring methods. explain methods for grounding frames of ranges, dryers, and associated equipment. explain use of grounded circuit conductor for grounding equipment. explain methods for connecting receptacle grounding terminals. explain bonding of general-use snap switches. explain methods for achieving continuity and attachment of equipment grounding conductors to boxes.

After studying this unit, the reader will be able to explain requirements for grounding and bonding in hazardous (classified) locations. summarize grounding and bonding requirements in patient care spaces of health care facilities. explain wiring methods permitted in patient care spaces and the mechanical protection requirements for patient care spaces of health care facilities. summarize grounding requirements for agricultural buildings and structures supplied overhead and underground from a site-isolation device. explain requirements for an equipotential plane and for GFCI protection in agricultural buildings or structures. summarize grounding and bonding requirements for services and feeders for mobile homes and manufactured homes. explain grounding and bonding requirements for services and feeders for recreational vehicle parks and sites. summarize grounding requirements for marinas, floating buildings, boatyards, as well as commercial and noncommercial docking facilities.