June 23, 2005 A PRIMEDIA Property Vol. III No. 12


CONTENTS
Article 353 -- High-Density Polyethylene

Black, White, and Red All Over

What's Wrong Here?

Code Q&A

Code Quiz

NFPA Solicits Proposals for 2005 NEC

Defining Defense

Grounding vs Bonding Seminar

NFPA Issues Call for Presentations


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    Top 2005 Code Changes
    Article 353 -- High-Density Polyethylene
    By Mike Holt
    This new article covers use, installation, and construction specifications for high-density polyethylene (HDPE) conduit and associated fittings. This type of conduit has been in use in the United Kingdom for a long time. It's lightweight and durable. It resists decomposition, oxidation, and hostile elements that cause damage to other materials. It's mechanically and chemically resistant to a host of environmental conditions. Uses include communication, data, cable television, and general-purpose raceways.

    Behind the change: HDPE can be used in continuous lengths in almost all outside underground locations. However, this product has different properties than rigid nonmetallic conduit, therefore it has its own article.


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    Nightmare Installations
    Black, White, and Red All Over
    A customer of mine who owns rental property recently had one of his properties inspected and was instructed to fix some receptacles in the kitchen. When I tested a receptacle at the end of the counter next to a window with my plug-in tester, all three lights on the tester lit up. This combination of lights wasn't on the list, so I checked the outlet with my multi-tester and found 125V from hot to neutral, which was fine, but then I measured 125V from neutral to ground and 250V from hot to ground. We deduced that someone had replaced a 250V receptacle (black and red on hot terminals, white on ground terminal) for a window A/C unit with a 125V receptacle and put black (hot) on the hot terminal, white (grounded) on the neutral terminal, and red (hot) on the ground terminal. Further investigation revealed that the wire was tapped into a dryer receptacle directly below it in the wall. Luckily, no one had been injured by this installation.
    Bruce Boma
    Champaign, Ill.


    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
    How does this installation violate the NEC?

    Hint: The copper GEC is enclosed in a rigid ferrous metal conduit.

    Code Q&A
    By Mike Holt
    Q. Must receptacles be installed so they can be removed without interrupting the power to any downstream receptacles?
    See the answer.

    Code Quiz
    By Steven Owen
    What's the allowable ampacity of each of the current-carrying conductors of a 4-conductor, 2 AWG, type SO cord that's rated 75°C by the manufacturer and connected to a 3-phase, 4-wire piece of equipment (no neutral load)? The conductors are installed in an area where the ambient temperature has been determined to be 50°C by a documented engineering study.

    1. 56A
    2. 71.25A
    3. 72.80A
    4. 86.45A

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


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    Code News Updates
    NFPA Solicits Proposals for 2005 NEC
    Seems like just yesterday that you received your copy of the 2005 NEC, doesn't it...so what better time than now to start thinking about making changes? Code-making panels are soliciting change proposals for the 2008 NEC, so now's your chance to voice your concerns about that requirement that's been bugging you. Proposals are due by 5 p.m. ET on Nov. 4. A copy of the proposal form is available in the back of the 2005 NEC or at NFPA's Web site.


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    Speak Out
    Defining Defense
    The word "grounding" is often used when "bonding" should be, and vice versa. Although each process plays an important role in the protection of electrical systems, confusion still remains as to what each means. Does the Code make an adequate distinction between the two concepts? Visit EC&M's Web site to tell us.

    CodeWatch readers confirm that the NEC isn't the only standard they monitor. In particular, more than two-thirds (69%) use NFPA 72 National Fire Alarm Code on a regular basis.

    Shows and Events
    Grounding vs Bonding Seminar
    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 four two-day seminars, 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.

    NFPA Issues Call for Presentations
    Got something important to say? NFPA has announced it's now accepting proposals for presentations at its World Safety Conference & Expo in Orlando, Fla., June 4-9, 2006. Proposals are due Aug. 1, 2005, and will be judged based on quality, relevance, focus, practical application, timeliness, and on the presenter's experience and credentials. Visit the NFPA 2006 WSC&E site to submit your proposal online, or download the form.

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