Consulting-Specifying Engineer - November 2007 - (Page 50)

Dance lessons Codes & Standards Current waveform showing arc fault Normal Current Waveform Current (amps) 20 10 0 -10 -20 Arc Fault 16mS 32mS 48mS 64mS 80mS 96mS Figure 2 AFCIs monitor wave form. When they detect a pattern similar to the blue one, AFCIs recognize this signature as being an arc fault. Arc faults take time An arc fault can begin with the smallest of damage to conductor insulation. At first, an imperceptible current flows through that weak link from one conductor to another. Over time, further damage develops as the insulation is heated by the arc beyond its tolerance. Eventually, the damage becomes significant enough to allow a more intense arc and to ultimately cause a fire. The intent of this article is not to scare anyone. The fact of the matter is electrical wiring, when installed cor- rectly, results in relatively few fires— let alone fatalities. The fact remains that AFCI circuit breakers can make projects safer ones. They are about 10 times more expensive than a regular breaker ($35 vs. $3.50), but the labor to install them is the same. It strikes me as a small price to pay. Regardless, as it looks right now, if you’re building residential construction in 2008 and beyond, you will not have a choice. And occupants of the building where you design electrical systems can rest easy that new wiring will be free of arc fault. Statement of Ownership, Management and Circulation Statement of Ownership, Management, and Circulation (Required by Title 39 United States Code 3685) of Consulting-Specifying Engineer (ISSN# 0892-5046), published monthly at Highlands Ranch, CO 80129-2345 for November 1, 2007. Annual Subscription Prices: $105.99 USA; 143.99 CAN; $143.99 MEX; $261.99 International. 1. Complete Mailing Address of Known Ofﬁce of Publication: Reed Business Information, 8878 South Barrons Blvd., Highlands Ranch, CO 80129-2345. 2. Complete Mailing Address of Headquarters or General Business Ofﬁce of Publisher: Reed Business Information, Division of Reed Elsevier Inc., 360 Park Avenue South, New York, NY 10010 3. Full Names and Complete Mailing Addresses of Publisher, Editor, and Managing Editor: Publisher, Jim Langhenry; Editor, Michael Ivanovich; and Senior Editor, Scott Siddens, Reed Business Information, 2000 Clearwater Drive, Oak Brook, IL 60523 4. The owner is Reed Business Information, a Division of Reed Elsevier, Inc., 360 PArk Avenue South, New York, NY 10010. 5. Extent and Nature of Circulation Average No. Copies Each Issue No. Copies of Single Issue During Preceding 12 Months Published Nearest to Filing Date A. Total Number of Copies (Net Press Run) 41,481 40,401 B. Paid and/or Requested Distribution (1) Paid/Requested Outside-County Mail Subscriptions 39,674 38,804 (2) Paid In-County Subscriptions (3) Sales Through Dealers and Carriers, 0 0 and Other Non-USPS Paid Distribution 32 27 (4) Other Classes Mailed Through USPS 0 0 C. Total Paid and/or Requested Circulation (Sum of 5B (1), (2), (3) and (4)) 39,706 38,831 D. Free Distribution by Mail (Samples, complimentary and other free) (1) Outside-County 914 932 (2) In-County 0 0 (3) Other Classes Mailed Through the USPS 67 0 E. Free Distribution Outside the Mail (Carriers or other means) 981 932 F. Total Distribution (Sum of 5C and 5E) 40,687 39,763 G. Copies not distributed 794 638 H. Total (Sum of 5F and 5G) 41,481 40,401 I. Percent Paid and/or Requested Circulation (5C divided by 5F times 100) 97.59% 97.66% 6. This statement of ownership will be printed in the November issue of this publication. 7. I certify that all information furnished on this form is true and complete. I understand that anyone who furnishes false or misleading information on this form or who omits material or information requested on the form may be subject to criminal sanctions (including ﬁnes and imprisonment) and/or civil sanctions (including civil penalties). Simon Young (signed), Group Audience Marketing Director. Metraloop® expansion joints let your pipe move without thrust loads. Use it for thermal expansion and seismic movement. Boogie over to our web site for CAD downloads, case histories and more. ©2007 The Metraflex Company Seismic movement Thermal movement Fire sprinkler systems www.metraflex.com Input #233 at csemag.com/quickResponse http://www.metraflex.com http://csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - November 2007

Consulting-Specifying Engineer Contents Editor's Viewpoint Letters In The News M/E Roundtable Emergency Power for Healthcare 2007 Products of the Year Industrial-strength Lighting Hazardous HVAC Codes and Standards Management Report Jobs/Classifieds Specifier's Notebook On-Peak Performance Contents Best Battery Selector in Engine Starting Applications NEC 708: Practical Impact on Backup Power Systems Protecting Power: Specifying Outdoor Generator Enclosures Investing in Backup Power Systems Coes, Consultants, Manufacturers, and Standby Power Systems

Consulting-Specifying Engineer - November 2007

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