Archives 2008
Issue No. 322
Issue No. 323
Issue No. 324
Issue No. 325
Issue No. 326
Issue No. 327
Issue No. 328
Issue No. 329
Issue No. 330
Issue No. 331
Issue No. 332
Issue No. 333
Issue No. 334
Issue No. 335
Issue No. 336
Issue No. 337
Issue No. 338
Issue No. 339
Issue No. 340
Issue No. 341
Issue No. 342
Issue No. 343
Issue No. 344
Issue No. 345
Issue No. 346
Issue No. 347
Issue No. 348
Issue No. 349
Issue No. 350
Issue No. 351
Issue No. 352
Issue No. 353
Issue No. 354
Issue No. 355
Issue No. 356
Issue No. 357
Issue No. 358
Issue No. 359
Issue No. 360
Issue No. 361
Issue No. 362
Issue No. 363
Issue No. 364
Issue No. 365
Issue No. 366
Issue No. 367
Issue No. 368
Issue No. 369
Issue No. 370

  Log In

 

November 2, 2008

                             []< ET NEWS                               
====================================================================== 
    NEWS AND INFORMATION FOR THE FIRE PROTECTION ENGINEERING TEAM      
---------------------------------------------------------------------- 
 Issue No. 363  ISSN 1554-074X      http://www.etnews.org   11-2-2008  
====================================================================== 
 
Contents 
-------- 
- News 
- Journal 
- Employment 
- Seminar Schedule 
- Comments & Acknowledgements 
 
====================================================================== 
NEWS 
====================================================================== 
 
IAFF Says Don't Just Change Your Batteries -- Change Your Smoke ...
MarketWatch - USA
WASHINGTON, Oct 29, 2008 (BUSINESS WIRE) -- The International 
Association of Fire Fighters (IAFF) is urging households to change 
more than just smoke alarm ... 
http://www.marketwatch.com/news/story/IAFF-Says-Dont-Just-Change/story
.aspx?guid=%7BFBE17BB8-A553-4665-AC18-6576CD668A6E%7D 
 
---------------------------------------------------------------------- 
 
Nov. 17-18 Symposium Explores Fire Safety in the Next 25 Years
Occupational Health Safety - Dallas,TX,USA
... and representatives of NIST, Marriott Corp., Underwriters 
Laboratories, the National Fire Sprinkler Association, GE Fire and 
Security, FM Global, ...  
http://ohsonline.com/Articles/2008/10/30-Symposium-Explores-Fire-
Safety-in-the-Next-25-Years.aspx 
 
---------------------------------------------------------------------- 
 
WTC Investigation Leads to Code Changes for Safer Buildings in US
AJP Online - Gravesend,England,UK
The changes, adopted at recent ICC hearings, will be incorporated into 
the 2009 edition of the ICC I-Codes, specifically the International 
Building Code ... 
http://www.ajponline.co.uk/ViewArticle_1641.aspx 
 
---------------------------------------------------------------------- 
 
This week I'll see you in Los Angeles. 
http://www.afaa.org/pdf/BasFA_PR_101_LosAngeles_Nov2008.pdf 
 
Have fun! 
 
- Mike 
mailto:mike@etnews.org 
 
DL-115,615 AS-20,781 HA-2,602 CO-1,000 F9-650 UA-500 
 
====================================================================== 
                            ADVERTISEMENT                              
====================================================================== 
 CENTRAL STATION MONITORING                   UL(r) listed monitoring  
 All major formats plus AES, SafeCom, ScanAlert, & Video Verification  
  *** 2008 New Dealer Special - 1 YEAR FREE ADDITIONAL SERVICES ***    
 Free Web Access                         mailto://begeord@cuaccess.net 
 503-630-8961 voice || 503-630-8944 fax  http://www.csmul.com          
====================================================================== 
ET NEWS JOURNAL                                                        
====================================================================== 
 
IONIZATION VS. PHOTOELECTRIC.  WHICH IS BEST? 
--------------------------------------------- 

The short answer is yes.  Both are effective at providing early 
warning.  However, they respond differently to different types of 
fires.  NFPA 72 includes mostly good information regarding their 
principles of operation: 
 
NFPA 72-2007 3.3.181.2* Ionization Smoke Detection. 
The principle of using a small amount of radioactive material to 
ionize the air between two differentially charged electrodes to sense 
the presence of smoke particles. Smoke particles entering the 
ionization volume decrease the conductance of the air by reducing ion 
mobility. The reduced conductance signal is processed and used to 
convey an alarm condition when it meets preset criteria. (SIG-IDS) 
 
NFPA 72-2007 A.3.3.181.2 Ionization Smoke Detection. 
Ionization smoke detection is more responsive to invisible particles 
(smaller than 1 micron in size) produced by most flaming fires. It is 
somewhat less responsive to the larger particles typical of most 
smoldering fires. Smoke detectors that use the ionization principle 
are usually of the spot type. 
 
I disagree with this annex material.  It's misleading.  It suggests 
that ionization smoke detectors are more responsive to the invisible 
particles of combustion resulting from flaming fires as if the size of 
the particle is key to its success.  While flaming fires produce small 
particles of combustion, the ionization smoke detector is responding 
to the particle's electric charge - another feature of flaming fires, 
which are violent chemical reactions that rip electrons out of orbit 
resulting in charged particles. 
 
NFPA 72-2007 3.3.181.4* Photoelectric Light-Scattering Smoke Detection. 
The principle of using a light source and a photosensitive sensor 
arranged so that the rays from the light source do not normally fall 
onto the photosensitive sensor. When smoke particles enter the light 
path, some of the light is scattered by reflection and refraction onto 
the sensor. The light signal is processed and used to convey an alarm 
condition when it meets preset criteria. (SIG-IDS) 
 
NFPA 72-2007 A.3.3.181.4 Photoelectric Light-Scattering Smoke Detection. 
Photoelectric light-scattering smoke detection is more responsive to 
the visible particles (larger than 1 micron in size) produced by most 
smoldering fires. It is somewhat less responsive to the smaller 
particles typical of most flaming fires. It is also less responsive to 
black smoke than to lighter colored smoke. Smoke detectors that use 
the light-scattering principle are usually of the spot type. 
 
This annex material is right on.  Photoelectric light-scattering spot-
type smoke detector response is a function of particle size, which 
must be large enough to scatter light. The stated visibility/
invisibility threshold of 1 micron is not precise.  The actual 
threshold is a function of the light source wavelength. 
 
The best choice of spot-type detector is dependent upon the type of 
fire expected.  Ionization is more responsive to flaming fires while 
photoelectric is more responsive to smoldering fires.  Without knowing 
which type of fire to respond to, maybe the best choice is to use both.
It's not pretty but it's effective. 

- Mike 
 
This response should not be considered a formal interpretation but 
rather the author's opinion.
 
====================================================================== 
                            ADVERTISEMENT                              
====================================================================== 
LIGHT ENGINEERED DISPLAYS, INC.       UL, CSFM and MEA Listed Products 
Graphic and Directory Annunciators    Firefighter Smoke Control Panels 
AquaALERT Water Leak Detection   ARA Systems, Protective Device Covers 
       Complete catalog and specifications available on request        
800-251-2512     -       FAX 800-251-9878       -       www.ledinc.com 
====================================================================== 
JOB OPPORTUNITIES
====================================================================== 
 
JOB OPPORTUNITY and SEEKING EMPLOYMENT announcements are provided as a
service.  ET News provides a venue for direct contact between job 
seekers and employers.  ET News is not a placement agency and does not
endorse either job seekers or employers. 
 
Post your announcement at http://www.etnews.org/index.php?s=257 
 
====================================================================== 
SEMINAR SCHEDULE
====================================================================== 
 
---------------
IMPORTANT NOTE:
--------------- 
We have scheduled seminars for approximately 1/2 of the available 
dates in 2009.  If you would like to sponsor seminars in the new year, 
please contact me. 
mailto:mikebaker@afaa.org 
 
------------------ 
November 4-6, 2008 Los Angeles, CA 
------------------ 
Basic Fire Alarm Seminar 
Fire Alarm Plan Review 
Understanding Life Safety Code Fire Alarm Requirements 
http://www.afaa.org/pdf/BasFA_PR_101_LosAngeles_Nov2008.pdf 
 
------------------ 
November 10-14, 2008 Edmond, OK  
------------------ 
Basic Fire Alarm Seminar 
Intermediate Fire Alarm Seminar (NICET I & II) 
Advanced Fire Alarm Seminar (NICET III & IV) 
http://www.afaa.org/pdf/AdvFA_IntFA_Edmond_Nov2008.pdf 
 
------------------ 
November 20, 2008 East Hanover, NJ 
------------------ 
Understanding IBC Fire Alarm Requirements  
http://www.afaa.org/pdf/IBC_AFAA-NJ_Nov2008.pdf 
 
------------------ 
December 1-3, 2008 Los Angeles, CA 
------------------ 
Fire Alarm System Testing and Inspection 
Intermediate Fire Alarm Seminar (NICET I & II) 
http://www.afaa.org/pdf/TI_IntFA_LosAngeles_Dec2008.pdf 
 
------------------ 
December 9-11, 2008 Tulsa, OK 
------------------ 
Understanding Life Safety Code Fire Alarm Requirements 
Understanding IBC Fire Alarm Requirements  
Fire Alarm Plan Review 
Fire Alarm System Testing & Inspections 
http://www.afaa.org/pdf/101_IBC_PR_TI_Tulsa_Dec2008.pdf 
 
------------------ 
January 12-14, 2009 Honolulu, HI 
------------------ 
Fire Alarm System Testing & Inspections 
Advanced Fire Alarm Seminar (NICET III & IV) 
http://www.afaa.org/pdf/TI_AdvFA_Honolulu_Jan2009.pdf 
 
------------------ 
January 27-29, 2009 Dallas, TX 
------------------ 
Fire Alarm System Testing & Inspections 
Intermediate Fire Alarm (NICET I & II)
More info to follow ... 
 
------------------ 
February 17-19, 2009 Burbank, CA 
------------------ 
Fire Alarm System Testing & Inspections 
Advanced Fire Alarm (NICET III & IV)
http://www.afaa.org/pdf/TI_AdvFA_Burbank_Feb2009.pdf 
 
------------------ 
February 26-27, 2009 Las Vegas, NV Educode  
------------------ 
Intermediate Fire Alarm (NICET I & II)
http://www.iccsafe.org/training/EduCode/ 
 
====================================================================== 
COMMENTS AND ACKNOWLEDGEMENTS 
====================================================================== 
 
ET News is written nearly every week and almost always sent on Sunday. 
 
Doug Hockinson built ETNews.org using PHP/MySQL-> http://www.phpvs.com 
 
Purchase new & used codes & standards on line http://tinyurl.com/36zzk 
 
---------------------------------------------------------------------- 
Some information may be found in this message and etnews.org that is   
reprinted with permission from one or more of the following; NFPA 70   
National Electrical Code(r), NFPA 72(r) National Fire Alarm Code(r),   
NFPA 101(r) Life Safety Code(r), Copyright(c) NFPA, Quincy, MA 02269   
This reprinted material is not the complete and official position of   
the NFPA on the referenced subject, which is represented only by the   
standard in its entirety.                                              
====================================================================== 
+--------------------------------------------------------------------+ 
|                   Michael Baker & Associates Inc                   | 
| (800) 734-3902 || PO Box 737, Gladstone OR 97027 || mba@etnews.org | 
+--------------------------------------------------------------------+ 
ET News(SM) Copyright(c) 2008 by Michael B. Baker. All rights reserved 
1,653 subscribers
Send a link to a friend        
 

 

Home - Clients - Book Store - NICET Level I - NICET Level II - NICET Level III - NICET Level IV - Glossary - External Links - Licensing - Photographs - Employment - Disney Crud(SM) - Archives 2001 - Archives 2002 - Archives 2003 - Archives 2004 - Archives 2005 - Archives 2006 - Archives 2007 - Archives 2008 - Archives 2009 - Archives 2010 - Archives 2011 - Archives 2012 - Archives 2013 - Misc

ET NewsSM content copyright © 2017
by Michael B. Baker. All rights reserved.
ISSN 1554-074X

RSS Content
Some information may be found within this web site that is reprinted with permission from one or more of the following: NFPA 70 National Electrical Code®,NFPA 72® National Fire Alarm Code®, & NFPA 101® Life Safety Code®, Copyright© NFPA, Quincy, MA 02269.

This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.