November 8, 2005 A PRIMEDIA Property Vol. III No. 21



CONTENTS
Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
725.61 Applications of Class 2 and Class 3 Cables

Miss Authorization

What's Wrong Here?

Code Q&A

Code Quiz

Grounding vs Bonding Seminar


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    Top 2005 Code Changes
    Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
    725.61 Applications of Class 2 and Class 3 Cables

    By Mike Holt
    New sentence identifies the type of nonmetallic raceway containing Class 2 or Class 3 cables that is permitted in "other spaces used for environmental air." (Note: Code text has been paraphrased.)

    What the Code says:
    Class 2, Class 3, and PLTC cables must comply with the requirements of (A) through (H).
    A) Ducts, Plenums and Other Space Used for Environmental Air. Class 2 or Class 3 cables cannot be run in ducts or plenums, even if plenum rated [725.3(B)], but plenum-rated Class 2 or Class 3 cables can be installed above a suspended ceiling or below a raised floor that is used for environmental air. Listed plenum raceways can be installed above a suspended ceiling or below a raised floor used for environmental air [300.22(C)], but only if the cables contained in these raceways are plenum-rated Type CL2P, or CL3P.
    (Text new to the Code is underlined.)

    Behind the change: Nonplenum-rated Class 2 and Class 3 cables within electrical metallic tubing, as permitted by 300.22(C), can be installed above a suspended ceiling or below a raised floor that is used for environmental air.


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    Nightmare Installations
    Miss Authorization
    When called to install a dedicated circuit for a new bathroom spa/tub, I gave a fair bid and was awarded the job by the lady who owned the home. As I neared completion, a gentleman who had accompanied the woman earlier in the day asked me to also do a "few other items" concerning the bath's lighting circuits and outlets. I found these requests within the broad scope of the job and completed them as asked. When the lady returned at the completion of the job she refused to pay for the "extra" work, stating the gentleman was merely a friend and had no authority to authorize any work at all. Since I had no contract and no verbal agreement with the owner, I had no recourse to recover my lost services. This was a lesson learned at some cost.
    Mike Huwe
    Manhattan Beach, Calif.

    Send your 200-word story to us and it may appear in a future issue of CodeWatch. Authors of stories chosen will receive $25.


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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: Which one of these covers meets the Code?










    Code Q&A
    By Mike Holt
    Q. A fellow electrician told me if I were to wire an aboveground storable pool pump motor for 240V operation, the receptacle outlet would need to be located 10 feet from the pool. I thought five feet was the minimum. Who's right?

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


    Code Quiz
    By Steven Owen
    Q. What is the minimum cable tray width required for an installation that consists of six sets of 1,000 kcmil conductors (rated 600V) bundled in six sets of three-each conductors in an uncovered ladder type tray? The bundles are configured in the form of a triangle -- two side-by-side on the bottom with the third sitting on top of the two. The cable tray is not listed for grounding and will not be used as the equipment grounding conductor. As such, there are a total of 19 conductors in the tray. The outer diameter of all 19 conductors is 1.44 inches. Do you know the proper name of this 19th conductor?

    A) 17.28 inches minimum / equipment bonding conductor
    B) 18.72 inches minimum / equipment grounding conductor
    C) 25.92 inches minimum / grounded conductor
    D) 27.36 inches minimum / grounding electrode conductor

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


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    Shows and Events
    Grounding vs Bonding Seminar
    Time is running out! You only have two more chances this year to attend one of Mike Holt's grounding versus bonding seminars. Grounding and bonding of electrical systems, sensitive electronic, and communications equipment is the most important and least understood activity in the electrical, data processing, and communications industry. At this two-day seminar, Code expert Mike Holt will explain the basics as well as the advance concepts necessary to understand the practical grounding and bonding rules in the NEC for systems not over 600V.

    Download the conference brochure for specific dates and locations.



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