[TenTec] ufer ground?

[GARY HUBER]

The significant requirement is that the rebar sections are bonded together 
using using an exothermic process (welded). If the rebar (cage in tower 
base) is just tied together (with wire) there may be enough resistance 
between rebar sections when dissipating a lightning strike to cause heating 
and bursting of concrete. If you do NOT know if the rebar is welded you may 
want to reconsider your grounding options.

My previous work place used a Ufer ground mat (basement floor rebar of all 
buildings of the complex) bonded to building steel (and pilings) with copper 
grounding bars bonded to them. An external ground ring with ground rods was 
bonded to each vertical building steel member, with air terminals (on each 
building roof) bonded to building steel. Copper grounding bars in 14th story 
equipment room were connected to the ground mat with a 250 foot run of a 
pair of 400 MCM cables. The electrical service neutral and mechanical ground 
were also referenced to the ground mat.  When you have radio antennas at 
1027 feet AMSL,  (197 feet AGL) and main frame computers in the same 
complex,  you don't want a strike to take everything off line.

YMMV


73 ES DX,
Gary -- AB9M

-----Original Message----- 
From: denton sprague
Sent: Monday, August 12, 2013 8:20 AM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] ufer ground?

I know this is kinda beating a dead horse to death, but ran across this 
today….
http://www.comm-omni.com/polyweb/ufertower.htm

first time I have ever heard of a ufer ground….a recent post by KI6CFW on 
eham also says this…

A ufer is a length of rebar (minimum of 20-25' or so long) embedded in the 
building's concrete footer.  One end of the rebar is bent up and extends out 
from the concrete (usually near the electric service panel).  The ground 
from the electric service panel is attached to the piece of rebar.


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