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Keeping up with the requirements of the Code should be the goal of
everyone involved in electrical safety. The following is what I feel is an
important rule in the 2020 NEC®, complete with
graphics and a video. I encourage you to use it as a training resource for
your organization, and share it with your colleagues.
| Service Disconnecting Means [230.71] |
The content below is extracted from Mike Holt's Changes to the National Electrical Code textbook, based on the 2020 NEC. Be sure to download the PDF to follow as you watch the video.
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Click here or on the thumbnail to the left to view or download the PDF of this rule. (2 pages, 246 KB)
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Click on the image above to watch the video
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Changes and revisions are made to the National Electrical Code every three years. Many changes are editorial, but every once in a while, a change is made that is significant. This is the case with the changes made to 230.71, Maximum Number of Disconnects, particularly the changes made in 230.71(B)—Two to Six Service Disconnecting Means.
You may already be familiar with the “six disconnect (or movements of the hand) rule” where no “Main Disconnect” is required for six or less service disconnecting means grouped together, but you may not know that the 2020 NEC requires each of those disconnects to have “Separate enclosures with a main service disconnecting means in each enclosure” [230.71(B)(1)]. This change is significant for a variety of reasons such as:
- It allows the installer to operate a single disconnect to de-energize all conductors and circuit parts in the enclosure.
- It enhances safety by reducing the likelihood of an incident with energized conductors or circuit parts in service equipment.
This change impacts the meter stacks that we are accustomed to using. Read the attached text and take the time to watch the video where Mike and a panel of Code experts discuss this revision to the 2020 NEC.
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We'd
love to hear from you about this series, and the ways you're using it.
Send us your comments and feedback by clicking on "Post a Comment"
below. Look out for the next part in this series a month from now, and
please share with your colleagues. |
This content is extracted from Mike Holt's Changes to the National Electrical Code, based on the
2020 NEC Program.
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