[Top] [All Lists]

[Towertalk] Grounding the mast

To: <>
Subject: [Towertalk] Grounding the mast
From: (
Date: Thu, 08 Aug 2002 15:34:40 +0000
Most experts (?) agree that one should run a ground 
jumper wire from the mast to a tower leg before the 
rotator so that strike energy does not go through the 
rotator and possibly welding the bearings to the bearing 
race.  Personally I used #4 welding cable which had many 
small wires for low impedance path and high current 
carrying capability. (Some experts suggest ground braid 
whilst others warn against it due to corrosion between 
the exposed braid wires causing increased impedance 
and/or diode effects.)  I connected it from the top bolt 
on the rotator's mast clamp to a predrilled hole in the 
nearby tower leg.  I wrapped the welding cable's rubber 
jacket with electrical tape to protect against UV 
degradation.  Phil  KB9CRY
> Typical installations place a mast above the tower, mounted to a rotator 
> and in a bearing at the top of the tower.  These connections to the 
> tower are through bearings, which puts the bearings at some risk if the 
> mast takes a lightning stroke.  Transmission lines from any antennae on 
> the mast provide parallel conductive paths to the tower and to the 
> ground system.
> Is this a problem?
> What are some additional ways to ground the mast?  What if the mast and 
> tower are both aluminum?
> 73 de WO0W
> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site: 
> Call 888-333-9041 to place your order, mention you saw this ad and take an 
> additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list

<Prev in Thread] Current Thread [Next in Thread>