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 installations. When it comes to direct current (DC) systems, there are some additional considerations that must be taken into account. This lesson will provide an overview of the specific requirements outlined in Article 250 for DC systems.

Direct current systems typically use negative or positive grounding, depending on the application. Negative grounding means that the negative side of the power source is grounded, while positive grounding means that the positive side of the power source is grounded. The grounding method used in a DC system will depend on the equipment and its intended use.

In accordance with Article 250, DC systems must comply with the following grounding and bonding requirements:

  1. Grounding Electrode System
  • The grounding electrode system for a DC system must comply with the requirements of Article 250, Part III, including the use of at least one grounding electrode, such as a rod or plate, to provide a path to ground.
  • The grounding electrode conductor must be sized in accordance with Table 250.66, based on the largest ungrounded conductor in the circuit.
  1. Equipment Grounding Conductor
  • DC systems must have an equipment grounding conductor sized in accordance with Table 250.122, based on the maximum overcurrent protection device (OCPD) size for the circuit.
  • The equipment grounding conductor must be connected to the grounding electrode system and to any metal equipment enclosures or raceways in the system.
  1. Bonding
  • Metal parts of the DC system, including raceways, enclosures, and equipment, must be bonded together to ensure electrical continuity and prevent the buildup of hazardous voltages.
  • Bonding jumpers must be installed around any non-current-carrying metal parts that are likely to become energized in the event of a fault or other abnormal condition.
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