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

Table 240.92 of the National Electrical Code (NEC) provides minimum conductor sizes for ground wires based on the size and type of overcurrent protection device (OCPD) used. It helps to ensure that the ground wire can handle the fault current that may occur in the event of a short circuit or ground fault.

To use Table 240.92, you will need to know the rating of the OCPD that you plan to use and the type of conductor you are using. Here are the steps to follow:

  1. Determine the ampere rating of the OCPD: Look at the label on the circuit breaker or fuse to determine the ampere rating of the OCPD that you plan to use.

  2. Determine the type of conductor: The type of conductor used will depend on the installation location and the application. For example, in wet locations, you may need to use a different type of conductor than in a dry location.

  3. Locate the appropriate row and column in Table 240.92: Find the column that corresponds to the ampere rating of the OCPD and the row that corresponds to the type of conductor being used.

  4. Determine the minimum size of the grounding conductor: The minimum size of the grounding conductor is listed in the cell where the row and column intersect.

Example: If you are using a 50-ampere OCPD and a copper conductor in a dry location, you would locate the 50-ampere column and the copper row in Table 240.92. The minimum size for the grounding conductor would be #10.

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