Some of you have completed our Online Continuing Education Courses which include video instruction. For the rest of you we are sending a weekly series of newsletters featuring an instructional page complete with videos.

To view the videos you will need to download the free Real Player Download Real Player plugin for your browser - if you don't already have it. After installing Real Player, you can view the videos by clicking on one of these icons:

  • Click on this icon Hi Res - Cable/DSL [5622Kb] if you have a cable or DSL connection.
  • Click on this iconLow Res - Modem [1695Kb] if you have a Dial-up connection.

Below is the full course page which includes these videos:



Article 240 Low Res - Modem [1695Kb] Hi Res - Cable/DSL [5622Kb]        Page 2 of 8

Overcurrent Protection

240.2 Definitions

The following definitions were added for Article 240:

Current-Limiting Overcurrent Protective Device. A current-limiting overcurrent protective device that will reduce the fault current to a magnitude substantially less than that obtainable in the same circuit if the current-limiting device were replaced with a conductor.

Author’s Comment: This definition is needed in the application of the requirements for disconnecting means for fuses [240.40] and noninterchangeable of cartridge fuseholders [240.60(B)]. This definition was located in Section 240-11 in the 1999 NEC.

Tap Conductors. As used in this article, a tap conductor is defined as a conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply, that exceeds the value permitted for similar conductors that are protected as described elsewhere in this section. Figure 240–1

Author’s Comment: This definition is needed in the application of the requirements for Branch Circuit Taps [210.19(D) and ‘Feeder Tap Conductors [240.21(B)]. The text was slightly revised to clarify that service conductors are not to be considered tap conductors. This definition was located in Section 240-3(e) in the 1999 NEC.

Intent: The purpose of adding a section for definitions was to make it easier to apply the requirements contained in Article 240.


Figure 240-1
(Click on Image to Enlarge)

Copyright © 2003 Mike Holt Enterprises,Inc.
1-888-NEC-CODE (1-888-632-2633)