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June 27, 2004

                               ET NEWS                                
======================================================================
             NEWS AND INFORMATION FOR THE ENGINEERING TEAM           
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Issue No. 157   http://etnews.org   mailto:mike@etnews.org   6-27-2004
======================================================================

Contents
--------
- News
- ET News Journal
- Job Opportunities
- Fire Alarm Class Schedule
- Comments & Acknowledgements

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NEWS 
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LOOP fire panel ends probe with call for high-rise sprinklers
Chicago Sun Times - Chicago,IL,USA
... also recommended the city update its building code to adopt ... Murphy said
she was unaware of the state code. ... to comply with national and international
safety has ...
http://www.suntimes.com/output/news/cst-nws-fire25.html

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NEW Certificate Program for Fire Sprinkler Technicians BuildingOnline
- Dana Point,CA,USA
... During the program, the participant will be completely prepared and
qualified to sit for the NICET Level 2 exam. By the end of the ...
http://www.buildingonline.com/news/viewnews.pl?id=3232&subcategory=18

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DON'T take fire safety lightly
Toronto Star - Toronto,Ontario,Canada
... the speed with which a fire can spread and how quickly carbon monoxide can
lead ... of the prime weapons in fighting fire deaths, of course, is the smoke
detector. ...
http://www.thestar.com/NASApp/cs/ContentServer?pagename=thestar/Layout/Article_
Type1&c=Article&cid=1087729264313&call_pageid=991479973472&col=991929131147

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I'll see you in Happyrock this week.

Have fun!

Mike
mailto:mike@etnews.org

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ET NEWS JOURNAL 
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WIRING METHODS AND MATERIALS
----------------------------

Today most fire alarm systems are installed using power-limited wiring methods
and materials. When doing so many people think that they have but one method
available when in fact they have 3 methods to choose from
(references are from NFPA 70-2002).

760.52 Wiring Methods and Materials on Load Side of the PLFA Power Source.
Fire alarm circuits on the load side of the power source shall be permitted to
be installed using wiring methods and materials in accordance with either
760.52(A) or (B).

(A) NPLFA Wiring Methods and Materials. Installation shall be in accordance with
760.25, and conductors shall be solid or stranded copper.
Exception No. 1:  The derating factors given in 310.15(B)(2)(a) shall not apply.
Exception No. 2:  Conductors and multiconductor cables described in and
installed in accordance with 760.27 and 760.30 shall be permitted.
Exception No. 3:  Power-limited circuits shall be permitted to be reclassified
and installed as nonpower-limited circuits if the power-limited fire alarm
circuit markings required by 760.42 are eliminated and the entire circuit is
installed using the wiring methods and materials in accordance with Part II,
NonPower-Limited Fire Alarm Circuits.
FPN: Power-limited circuits reclassified and installed as nonpower-limited
circuits are no longer power-limited circuits, regardless of the continued
connection to a power-limited source. 

(B) PLFA Wiring Methods and Materials. Power-limited fire alarm conductors and
cables described in 760.71 shall be installed as detailed in  760.52(B)(1), (2),
or (3) of this section. Devices shall be installed in accordance with 110.3(B),
300.11(A), and 300.15.

What does this alphabet soup of articles mean? It means that when installing
power-limited fire alarm components you have 3 choices:

1) Meet the requirements found in 760.52(A), which points to 760.25 for non-
power limited wiring methods and materials.
For example using 3/4" EMT with THHN 600V copper conductor 14AWG or larger wire
installed in accordance with appropriate articles of Chapter 3 Wiring Methods
and Materials. While you may use 16AWG and 18AWG, using 14AWG or larger allows
more choices in jacket insulation material.

2) Meet the requirements found within article 760.52(B) for non- power limited
wiring methods and materials
For example using NPLF, overall jacketed, 600V copper multiconductor 18AWG or
larger wire fished or concealed, supported at 18" intervals, and protected by
raceway, building construction, or a solid guard within 7' of the floor.

3) Meet the requirements found within article 760.25 for power-limited wiring
methods and materials
For example using FPL, overall jacketed, 300V copper multiconductor 26AWG or
larger wire fished or concealed, supported at 18" intervals, and protected by
raceway, building construction, or a solid guard within 7' of the floor.

In any event you'll see that you must also comply with certain other articles:

110.3(B) Read the instructions
310.11(A) Securely fasten conductors to the structure not the ceiling
300.15 Use a box and a bushing where required

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JOB OPPORTUNITIES 
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Place your "job opportunity" or "seeking employment" ad here. 
mailto:jobs@etnews.org

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FIRE ALARM CLASS SCHEDULE 
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------------------
July 6-8, 2004 Seattle, WA
------------------
Fire Alarm System Testing and Inspection Seminar
Intermediate Fire Alarm Seminar (NICET I/II) 
http://www.afaa.org/afaa/PDF/TI_IntFA_Seattle_Jul2004.pdf

------------------
July 13-15, 2004 Chicago, IL
------------------
Fire Alarm System Testing and Inspection Seminar
Advanced Fire Alarm Seminar (NICET III/IV) 
http://www.afaa.org/afaa/PDF/TI_AdvFA_Chicago_Jul2004.pdf

------------------
July 20-22, 2004 Salt Lake City, UT
------------------
Fire Alarm System Testing and Inspection Seminar
Intermediate Fire Alarm Seminar (NICET I/II) 
http://www.afaa.org/afaa/PDF/TI_IntFA_SaltLakeCity_Jul2004.pdf

------------------
August 17-19, 2004 Cincinnati, OH
------------------
Basic Fire Alarm Seminar
Fire Alarm System Testing & Inspections Seminar
Fire Alarm Plan Review Seminar
http://www.afaa.org/afaa/PDF/BasFA_TI_PR_Cincinnati_Aug2004.pdf

------------------
August 24-26, 2004 Indianapolis, IN
------------------
Fire Alarm Plan Review Seminar
Intermediate Fire Alarm Seminar (NICET I & II)
http://www.afaa.org/afaa/PDF/PR_UCR-IBC_Indy_Aug2004.pdf

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COMMENTS AND ACKNOWLEDGEMENTS 
======================================================================

ET News is written nearly every week and almost always sent on Sunday.

Doug Hockinson built the PHP/MySQL ET News website -> http://phpvs.com

Purchase NICET Element Review Handbook online http://tinyurl.com/28ldd

Purchase NFPA, ICC, and more on line: http://www.etnews.org/index.php?s=461

Purchase new & used codes & standards on eBay http://tinyurl.com/36zzk

----------------------------------------------------------------------
Some information may be found within this email message 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. 
======================================================================
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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.