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February 7, 2008 A Penton Media Publication Vol. VI No. 3

430.22 Single Motor -- Conductor Size

What's Wrong Here?

Code Q&A

Code Quiz

Don't Miss The Upcoming Electric West Show!

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    Top 50 NEC Rules

    430.22 Single Motor -- Conductor Size

    By Mike Holt
    Conductors to a single motor must be sized not smaller than 125% of the motor FLC rating as listed in:
    • Table 430.247 Direct Current Motors
    • Table 430.248 Single-Phase Motors
    • Table 430.250 Three-Phase Motors

    Editor's note: This information was extracted from Mike Holt's textbook, Understanding the National Electrical Code

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    Code Challenge
    What's Wrong Here?
    By Joe Tedesco
    Think you know how this installation violates the NEC? Visit EC&M's Web site to see the answer.

    Hint: Christmas in February.

    Code Q&A
    By Mike Holt
    Q. What are the Code requirements for bonding bushings on 277V or 480V branch and feeder and circuits?

    Visit EC&M's Web site to see the answer.

    Code Quiz
    By Steven Owen
    Q. On a 3-phase, 4-wire, 480/277V service, a question has arisen as to the required rating of the service disconnect. The calculated load is 780A. The fusible disconnecting means is rated at 1,000A, based on the maximum fuse size that can be installed. What is the minimum rating of the service disconnect permitted for this application?

    1. 800A
    2. 900A
    3. 1,000A
    4. All of the above

    Visit EC&M's Web site for the answer and explanation.

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    For more detailed information and to register online, visit

    Eliminate Red Tags

    It takes more than the UL Mark on a product to satisfy code requirements. Before your next installation, use UL's Code Compliance Database to identify the correlation between model codes and UL Certified products, as well as find manufacturers of certified products.

    Click here today to find up-to-date UL Listed products at the UL Code Correlation Database.

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