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January 24, 2008 A Penton Media Publication Vol. VI No. 2

422.31 Permanently Connected Appliance Disconnect

What's Wrong Here?

Code Q&A

Code Quiz

Code Committee Call-Up

Electric West

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    Top 50 NEC Rules

    422.31 Permanently Connected Appliance Disconnect

    By Mike Holt
    Appliance Rated at Not Over 300VA or 1/8 Horsepower
    The branch-circuit overcurrent device, such as a plug fuse or circuit breaker, can serve as the appliance disconnect.

    Appliance Rated Over 300VA or 1/8 Horsepower
    A switch or circuit breaker located within sight from the appliance can serve as the appliance disconnecting means. If the switch or circuit breaker is capable of being locked in the open position, it does not need to be within sight if the provision for locking or adding a lock is on the disconnecting means. "Within sight" is visible and not more than 50 feet from one to the other [Art. 100].

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

    The Fluke 1735 Power Logger is the ideal electrician or technician's power meter for conducting energy studies and basic power quality logging. Set the Power Logger up in seconds with the included flexible current probes and color display. The power quality meter measures most electrical power parameters, harmonics, and captures voltage events.

    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: Think horizontal.

    Code Q&A
    By Mike Holt
    Q. When PVC conduit is used, does the Code require an equipment grounding conductor between the meter enclosure and the service disconnect?

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

    Code Quiz
    By Steven Owen
    Q. In accordance with the 2008 NEC, excluding exceptions, arc-fault circuit-interrupter protection is required in which of the following dwelling unit locations?

    1. All 15- and 20-ampere, 120-volt, single-phase branch circuits in dwelling units
    2. Bedrooms only, omitting the smoke detector branch circuit
    3. Bedrooms only, including the smoke detector branch circuit
    4. Family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sun rooms, recreation rooms, closets, hallways, or similar rooms or areas

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

    Need help defining the parameters of your facility's next Arc Flash Hazard Evaluation? ESA's electrical engineers have written a detailed specification to help you determine what you need for your study. This Arc Flash tool is provided in a Word document that can be easily customized to include your facility's unique requirements. Request your Free Arc Flash Study Specification: Click here.

    Code News Update
    Code Committee Call-Up
    Got some extra time on your hands? Looking to put some of your vast knowledge of the electrical field to use? NFPA is looking for new members for several of its committees, including the following:
    • Committee on Electrical Systems Maintenance (seeking members in all categories, except special experts). This committee is responsible for NFPA 73, Electrical Inspection Code for Existing Dwellings.
    • National Electrical Code Panel 4 (seeking members in all categories). This panel is responsible for Articles 225, 230, 690, 692, and 705.
    • National Electrical Code Panel 13 (seeking members in all categories). This panel is responsible for Articles 445, 455, 480, 695, 700, 701, 702, and 708.
    Anyone interested in serving can download the application form at NFPA's Web site.

    Cool Electronic Cabinets
    EXAIR's low cost Cabinet Coolers stop electronic control downtime due to heat, dirt and moisture. UL Listed Cabinet Coolers produce 20 degree Fahrenheit air from an ordinary supply of compressed air to cool electrical controls. Thermostat control minimizes air usage. Maintains the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web site offers detailed information, downloadable drawings and PDF literature.

    Shows and Events

    Electric West

    Year after year, electrical contractors, consultants, engineers, plant managers, and other electrical professionals make it their business to stay on top of the latest industry developments by attending the Electric West Conference program, scheduled for Las Vegas from Feb. 27-29. It provides the tools you need to become more efficient, work faster, more profitably and stay ahead of the competition. Categories include:
    • Code Changes & Standards

    • Safety

    • Lighting

    • Residential Applications

    • Industrial Applications

    • Business Practices

    • Home Automation

    For 2008, the Power Quality segment will be expanded into its own separate conference. For more information and to register, visit the Electric West Web site.

    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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