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October 12, 2003

                             ET NEWS 
================================================================
        NEWS AND INFORMATION FOR ENGINEERING TECHNICIANS
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Issue No. 120         http://www.etnews.org           10-12-2003
================================================================

Contents
--------
- News
- ET Journal
- NICET Test Dates
- AFAA Class Schedule
- Comments & Acknowledgements

================================================================
NEWS 
================================================================

Is the National Electrical Code in Public Domain? 
Copyright - Durand & Associates
http://www.electric-find.com/nfpa.htm

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CITY holding workshop on fire alarm ordinance today Palatka Daily
 News, FL
Palatka residents and businesses have a chance to discuss a
proposed city alarm ordinance today that would assess fines for
false alarms from security systems. ...
http://www.palatkadailynews.com/pages/10092003/city.html

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FIRE alarm system gave Industronics its big break The Edge Daily,
Malaysia
... Its big break came in 1975 when the Fire Department made it
mandatory for buildings above four storeys to have fire alarm
systems. ...
http://www.theedgedaily.com/article.cfm?id=25491

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IMPROVING fire codes one goal of Fire Prevention Month
Elizabethton Star, TN
... To enhance the safety of the building, a complete fire alarm
system was installed, as well as hard-wired smoke detectors, fire
escapes and pull station fire ...
http://www.starhq.com/html/localnews/1003/100703fire.html

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WITH recent, tragic loss of lives at a nursing home, companies
such as National HealthCare Corp. are taking additional action. ...
http://www6.lexisnexis.com/wpublisher/EndUser?Action=UserDispla
yFullDocument&orgId=63&docId=l:53751463&topicId=13721&start=1&to
pics=single

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NOKIA Investigating Reported Cell Phone Explosions from the
pants-on-fire dept. posted by CowboyNeal on Thursday October 09,
@23:08 (pilot)
http://slashdot.org/article.pl?sid=03/10/10/0054230

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NFPA Installing Free Smoke Alarms. A year after a deadly home
fire killed six children in Holmes County, Miss., national
organizations and local leaders are working together to prevent 
...
http://www.securitysales.com/t_ci_newsView.cfm?nid=1231

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As sprinklers fail, so will new building code ...
http://www.njo.com/opinion/ledger/perspective/index.ssf?/base/n
ews-0/1063345401315921.xml

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I'll see you in Boston this week 
http://www.afaa.org/afaa/PDF/IntFA_NewEngland_Oct2003.pdf.

Have fun!

Mike
mailto:mbbaker@etnews.org

================================================================
ET JOURNAL 
===============================================================

In 2004, testing requirements of notification appliances will
change in UL 1971 SIGNALING DEVICES FOR THE HEARING IMPAIRED and
UL 464 AUDIBLE SIGNAL APPLIANCES. Effective May 1, 2004 the 80%-
110% of nameplate data will be replaced with a standard operating
voltage range; 16-33 volts for 24 volt devices and 8-17.5 volts
for 12 volt devices. This should make voltage-drop calculations
more consistent.

Along the same lines, what follows are some relevant references
to ponder.

NFPA 70 suggests limiting volt-drop in branch circuits to 3%:

NFPA 70-2002 210.19 Conductors — Minimum Ampacity and Size.
(A) Branch Circuits Not More Than 600 Volts.
(1) General.
---8<--- snip ---8<---
FPN No. 4: Conductors for branch circuits as defined in Article
100, sized to prevent a voltage drop exceeding 3 percent at the
farthest outlet of power, heating, and lighting loads, or
combinations of such loads, and where the maximum total voltage
drop on both feeders and branch circuits to the farthest outlet
does not exceed 5 percent, provide reasonable efficiency of
operation. See 215.2 for voltage drop on feeder conductors.

How would the 3% rule affect fire alarm circuits?
EXAMPLE: Assume load current is 1.5A and the distance from the
power source to the load is 500'

E = IR

E = maximum voltage drop allowed
I = load current
R = resistance of the conductors

3% of 20.4v = (1.5A)(R)
.612v/1.5A = R
.408ohm = R

No more than .408 ohm per 1000' of copper conductors
(500' distance). NFPA 70 Table 8 lists #4 AWG 7-strand uncoated
copper with .308 ohm per 1000'. Will #4 fit under the screw
terminal of your favorite horn or horn-strobe?

Rather than prosecuting the 3% rule, inspectors use ...
NFPA 70-2002 110.3 Examination, Identification, Installation,
and Use of Equipment.
---8<--- snip ---8<---
(B) Installation and Use. Listed or labeled equipment shall be
installed and used in accordance with any instructions included
in the listing or labeling.

NFPA 72-2002 4.4.4 Performance and Limitations.
4.4.4.1 Voltage, Temperature, and Humidity Variation. Equipment
shall be designed so that it is capable of performing its
intended functions under the following conditions: 
(1)* At 85 percent and at 110 percent of the nameplate primary
(main) and secondary (standby) input voltage(s)
---8<--- snip ---8<---

NFPA 72-2002 7.3.2 Nameplates.
7.3.2.1  Notification appliances shall include on their
nameplates reference to electrical requirements and rated audible
or visible performance, or both, as defined by the listing
authority.

... Which means that we can use the following method to determine
wire size:

V(load) = V(terminals) - (I(load) X R(conductors))

V(load) = Minimum operating voltage of appliance
V(terminals) = 20.4 volts (UL 864: 80% of 24 volts)
I(load) = Total current draw of connected appliances
R(conductors) = Total conductor resistance

16v = 20.4v - (1.5A X R)
1.5A X R = 20.4v - 16v
R = 4.4v/1.5A
R = 2.9ohm / 1000'

NFPA 70 Table 8 lists #12AWG 7-strand uncoated copper conductor
with 1.93 ohm per 1000'.

Both of these examples use the most conservative approach by
assuming that the entire load is at the end of the circuit. The
other methods include load-centering and point-to-point.

================================================================
NICET TEST DATES 
================================================================

OREGON
------
OR1 PCC Sylvania, Portland;
Test 11/15/03. Postmark deadline 9/27/03.
Test ??/??/04. Postmark deadline 12/1/03.

OR2 Clackamas Community College, Oregon City;
Test 11/15/03. Postmark deadline 9/27/03.
Test ??/??/04. Postmark deadline 12/1/03.

"It is anticipated that the 2004 schedule will be very similar to
the 2003 schedule. The dates for the first test cycle of 2004
will be January 24, February 22 and March 22. The first
application postmark deadline will be December 1, 2003. This
postmark deadline must be used by all examinees testing in the
first test cycle of 2004 until such time as the schedule for your
preferred sessions is established." 
http://63.70.211.210/cfdocs/nicetschedule1.cfm

For a complete list of all test centers and test dates, visit: 
http://63.70.211.210/cfdocs/nicetschedule.cfm

================================================================
AFAA CLASS SCHEDULE 
================================================================

------------------
October 15-17, 2003 Boston, MA - Sponsored by New England AFAA
------------------
Intermediate Fire Alarm Seminar 
http://www.afaa.org/afaa/PDF/IntFA_NewEngland_Oct2003.pdf

------------------
October 21-23, 2003 Anchorage, AK
------------------
Intermediate Fire Alarm Seminar 
http://www.afaa.org/afaa/PDF/IntFA_Anchorage_Oct2003.pdf

------------------
November 3-6, 2003 Anaheim, CA - Sponsored by CAFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW*
Advanced Fire Alarm Seminar 
http://www.afaa.org/afaa/PDF/PR_ADV_CAFAA_ANAHEIM_NOV2003.pdf

------------------
November 4-7, 2003 Boston, MA - Sponsored by New England AFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW*
*NEW* -> Understanding Code Requirements for Fire Alarm Systems 
More information will be available soon.

------------------
November 21, 2003 Reno, NV
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
http://www.afaa.org/afaa/PDF/PR_Reno_Nov2003.pdf

------------------
December 2-4, 2003 Phoenix, AZ - Co-sponsored by AZ AFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
*NEW* -> Advanced Fire Alarm Seminar (NICET III/IV)  <- *NEW* 
http://www.afaa.org/afaa/PDF/PR_ADV_Phoenix_Dec2003.pdf

------------------
December 9-11, 2003 San Antonio, TX - Co-sponsored by TX AFAA
------------------
Advanced Fire Alarm Seminar 
http://www.afaa.org/afaa/PDF/IntFA_SanAntonio_Dec2003.pdf

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

Engineering Technician info http://www.bls.gov/oco/ocos112.htm

ET News is published weekly and if possible, delivered on Sunday

ET News php/MySQL web site by: Doug Hockinson http://phpvs.com

The NICET acronym found herein refers to http://www.nicet.org 
NATIONAL INSTITUTE FOR CERTIFICATION IN ENGINEERING TECHNOLOGIES

The AFAA acronym found herein refers to http://www.afaa.org 
AUTOMATIC FIRE ALARM ASSOCIATION "celebrating 50 years!"
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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 National Fire Alarm
Code(r), and 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
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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.