[TowerTalk] New Tower Standard Update
donovanf at starpower.net
Sat Nov 19 11:11:26 EST 2005
For those who missed this last month, copies of TIA-222-G can
be purchased from TIA, but they are exceptionally expensive.
However... there is a pdf presentation on the web that contains
many of the key differences in TIA-222-G, including the new
wind and ice zone maps.
One of the changes is in the wind zones. TIA-222-G contains
over a hundred pages of wind and ice zone information for
every county in the US.
TIA-222-G has changed the way that windspeed is specified,
from the traditional "mile of wind" approach to a three second
maximum gust specification. The TIA-222-G minimum wind
speed requirement (applies to most counties in the US) is now
90 MPH three second gust, which is equivalent to a 75
MPH "mile of wind", 65 MPH sustained wind for 10 minutes or 62
MPH sustained wind for one hour.
Another aspect of TIA-222-G that could impact hams in the
future is the new requirement to evaluate the risk to human life
of new tower installations. When there is a risk to human life
(for example, if a tower could topple on a residence or a
populated area), the requirements become much more severe
than current standards. For a new tower in a location where
human life is not at risk, EIA-222-G is very similar to current
---- Original message ----
>Date: Sat, 19 Nov 2005 06:55:53 -0500
>From: Pete Smith <n4zr at contesting.com>
>Subject: [TowerTalk] Fwd: New Tower Standard Update
>To: towertalk at contesting.com
>Please pardon the forward, but I thought this was probably of
>>If you're involved in the purchase, design or installation of
communications structures you'll want to read this article to
stay abreast of the status of TIA/EIA-222-G. If you're not, or
know of other individuals that will benefit from this information,
please forward this email.
>>To G or not to G: that is the question
>>Revision G standard set for January introduction, but
acceptance may take up to three or more years
>>November 10, 2005 -- TIA/EIA-222-G will take effect
January 1, 2006, but building departments may be years away
from enforcing the long-awaited revision of the structural
standard for antenna supporting structures and antennas.
>>The short answer for the lengthy delay: TIA/EIA-222-G is a
voluntary standard and has no legal bearing. It only gains
formidable strength if it's referenced by the International
Building Code (IBC) or any other code, and the code is adopted
by a permitting jurisdiction.
>>But the code referencing and adoption process is a long,
sometimes arduous procedure that can oftentimes take years.
For additional information, please see:
>73, Pete N4ZR
>The World HF Contest Station Database
>was updated on 23 October 2005
>Over 3000 contest stations at
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