Course Content
Article 200 – Use and Identifications of Grounded Conductors
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Article 210 Branch Circuits
Article 210 of the National Electrical Code (NEC) covers the requirements for branch circuits, which are the circuits that supply power to the outlets, lighting fixtures, and other loads in a building. In this lesson, we will discuss the key requirements of Article 210.
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Article 215 Feeders
Article 215 of the National Electrical Code (NEC) covers the requirements for feeders, which are the circuits that supply power from the service equipment to the branch circuits in a building. In this lesson, we will discuss the key requirements of Article 215.
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Article 230 Services
In summary, Article 230 provides specific requirements for the installation of service conductors and equipment to ensure safe and reliable delivery of electrical power to buildings and structures.
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Article 242: Overvoltage Protection
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NEC Chapter 2 Wiring and Protection
About Lesson

Article 250 of the National Electrical Code (NEC) covers grounding and bonding requirements for electrical systems. In this lesson, we will focus on the general requirements of Article 250.

General Requirements:

  1. Equipment Grounding Conductors (EGCs): All electrical equipment that is not part of the electrical supply system, such as panels, disconnect switches, and motor controllers, must be connected to a grounding conductor. The size of the grounding conductor must be based on the size of the circuit conductors, as specified in Table 250.122.

  2. Grounding Electrode System: The grounding electrode system is a conductive path that connects the electrical system to the earth. The system must be installed in a manner that ensures the grounding electrode has a low impedance to the earth. A grounding electrode conductor must be installed to connect the grounding electrode system to the service equipment or source of a separately derived system.

  3. Bonding: Bonding is the process of connecting all metal parts of a building or structure together to ensure they are at the same electrical potential. This is done to reduce the risk of electrical shock or damage caused by lightning. Bonding jumpers must be installed to connect metal parts such as conduits, raceways, enclosures, and equipment.

  4. Grounding of Electrical Services and Separately Derived Systems: The grounding of electrical services and separately derived systems is essential to ensure the safety of personnel and equipment. The grounding electrode conductor must be connected to the grounded conductor of the service or separately derived system and the equipment grounding conductor.

  5. Grounding of Portable and Vehicle-Mounted Generators: Portable and vehicle-mounted generators must be grounded to prevent electrical shock hazards. The grounding electrode conductor must be connected to the generator frame and the equipment grounding conductor.

Summary: Article 250 of the NEC outlines the general requirements for grounding and bonding. These requirements include the installation of equipment grounding conductors, grounding electrode systems, bonding, grounding of electrical services and separately derived systems, and grounding of portable and vehicle-mounted generators. Adhering to these requirements ensures the safety of personnel and equipment.

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