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November 25, 2001

                   Northwest NICET Newsletter 
================================================================
Volume 1 Issue 22                                     11-25-2001
================================================================

        News for Fire Protection Engineering Technicians
        ------------------------------------------------

Contents:
---------
- News
- Tech Crud
- Test Dates
- Class Schedule
- Administrivia

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

My family and I had a wonderful Thanksgiving dinner together (except for
one wandering son in NJ). I hope you all had a happy Thanksgiving as
well!

----------------------------------------------------------------

From the NICET test schedule page:

It is anticipated that the 2002 schedule will be very similar to the
2001 schedule. The dates for the first test cycle of 2002 will be
January 19, February 23, and March 23. The first application postmark
deadline will be December 1, 2001. This postmark deadline must be used
by all examinees testing in the first test cycle of 2002 until such time
as the entire 2002 schedule is established.

Source: http://www.nicet.org/tests.shtml

================================================================
TECH CRUD
================================================================

Volt-drop calculation solution
------------------------------

What is the minimum 7-strand, uncoated copper wire size in AWG permitted
by NFPA 70-1999 in the following example:

    |<---------------- 2000' ---------------->|

+---+      .-.  .-.    .-.  .-.    .-.  .-.   +-------+
| + +--.  /   /     /   /     /   /   `--+ +++++ |
|   |   /    /    /    /    /    /      | +++++ |
| - +---'   /     /   /     /   /     .-+ +++++ |
+---+     `-'    `-'  `-'    `-'  `-'    `-'  +-------+
NAC Power Supply                              (1) Horn
Class 2 Power Limited                         .050A
24Vdc nominal                                 21-28Vdc

Average ambient temperature = 75 degrees centigrade.


Step 1)
-------
The minimum wire size is dependent upon the maximum permitted voltage
drop.

The manufacturer specifies that the horn will operate properly at a
minimum of 21Vdc and at a maximum of 28Vdc. Comparing the NAC power
supply voltage (24Vdc) with the minimum voltage at which the horn will
operate (21Vdc), we can determine the maximum voltage-drop permitted.

24Vdc - 21Vdc = 3Vdc = Ed (Maximum Volt-drop)

The manufacturer also specifies a current requirement of .05A.

I = .05A


Step 2)
-------

Using Ohm's Law to solve for R, which is the resistance represented by
the circuit:

R=Ed/I
R=(24v-21v)/.05A
R=3v/.05
R=60ohm

Another way to look at this answer is;

The maximum amount of resistance permitted by the circuit conductors is
60ohm.

The example is a 2000' 2-conductor circuit or;

a 4000' 1-conductor or;

The maximum amount of resistance permitted by the 4000' round-trip
circuit is 60ohm or;

15ohm/1000'


Step 3)
-------
NFPA 70-1999 Chapter 9, Table 8, page 567, Conductor Properties, is
where we find the smallest conductor size permitted, which will not
exceed 15ohm per 1000', which turns out to be 20AWG; 10.49ohm per 1000'.


================================================================
TEST DATES 
================================================================

Oregon
------
PCC Sylvania, Portland;
Test TBA/02. Postmark deadline 12/1/01.

Clackamas Community College, Oregon City;
Test 1/26/02. Postmark deadline 12/1/01.

Washington
----------
Bates Technical College, Tacoma;
Test TBA/02. Postmark deadline 12/1/01.

Walla Walla Community College;
Test 12/14/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Spokane Community College;
Test TBA/02. Postmark deadline 12/1/01.

Idaho
-----
Boise State University;
Test TBA/02. Postmark deadline 12/1/01.

Ricks College, Rexburg;
Test 12/15/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Montana
-------
Rocky Mountain College, Billings;
Test TBA/02. Postmark deadline 12/1/01.

Montana Tech, University of Montana, Butte;
Test TBA/02. Postmark deadline 12/1/01.

MT State University, Bozeman;
Test 12/15/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Flathead Valley Community College, Kalispell;
Test TBA/02. Postmark deadline 12/1/01.

For a complete list of all test centers and test dates, point your
favorite http client to -->http://www.nicet.org/tests.shtml

================================================================
CLASS SCHEDULE 
================================================================

Clackamas Community College is sponsoring a 16-hour Saturday
Seminar(r)in January 2002:

--> 1-12-2002 8am - 5pm NICET Certification application process and Fire
Alarm Systems Level I Element Review.

--> 1-19-2002 8am - 5pm Fire Alarm Systems Level II Element Review.

Visit the *Limited Energy Resource Center website to register -->
http://www.lerc.org or call Grant Angell at 503-657-0967.

================================================================
ADMINISTRIVIA 
================================================================

*Limited Energy Resource Center (LERC) is owned and operated by Grant
Angell. LERC arranges to provide seminars for individuals and groups.
LERC's list of available seminars include the NICET test preparation
seminars that I created and provide to trade associations, AHJ's, LERC,
and others. Grant does a great job promoting and scheduling seminars in
addition to coordinating the efforts of the many vendors required to
publish the NICET Handbooks that I write. He also maintains electrical
license CEU approval for these seminars from Oregon and Washington. I am
not an employee of LERC and I do not work for Grant Angell.

Send your contributions, suggestions, comments, and questions to -->
mailto:TheBakerGroup@home.com

To unsubscribe, click the reply button and type 'unsubscribe' in the
subject line.

Have fun!

Mike  http://go.to./baker

================================================================
Copyright (c) 2001 Michael B. Baker all rights reserved.
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ISSN 1554-074X

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