OT: Ground rods and concrete

[JOE-2]

Well, in my cellular experience of watching many tower and monopole
installations, tower grounds going thru concrete was generally not
allowed.  Several reasons that I have been told are moisture in the
concrete can turn to steam during a direct lightning hit, damaging the
concrete base material.  Ground conductors can be damaged by chemical
reaction from contact with the concrete and moisture.  Lastly, you
cannot do routine inspections on ground conductors that pass thru the
tower base.

Tower grounding specifications are detailed in Motorola R56 Standards
and Guidelines Manual.  This shows the ground conductors outside the
concrete tower base.

Joe

On 4/18/2017 8:05 AM, [hidden email] wrote:

> Message: 3
> Date: Mon, 17 Apr 2017 21:32:02 -0600
> From: "Doug Renwick"<[hidden email]>
> To: "'Elecraft Reflector'"<[hidden email]>
> Subject: Re: [Elecraft] OT: Ground rods and concrete
> Message-ID: <191B5755E4654B65951378A9EF28A8F1@DOUG8PC>
> Content-Type: text/plain; charset="us-ascii"
>
> That myth refuses to die. I have 5 concrete tower bases with ground rods
> partially encased and never a worry about an exploding base.
>
> Doug

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[Rick Dettinger-3]

The Electric Utility Industry spends a lot of money bypassing steel reinforced concrete tower legs with copper conductor to a ground system for lightening protection.

73, Rick  K7MW

 

> On Apr 18, 2017, at 7:16 AM, JOE <[hidden email]> wrote:
>
> Well, in my cellular experience of watching many tower and monopole installations, tower grounds going thru concrete was generally not allowed.  Several reasons that I have been told are moisture in the concrete can turn to steam during a direct lightning hit, damaging the concrete base material.  Ground conductors can be damaged by chemical reaction from contact with the concrete and moisture.  Lastly, you cannot do routine inspections on ground conductors that pass thru the tower base.
>
> Tower grounding specifications are detailed in Motorola R56 Standards and Guidelines Manual.  This shows the ground conductors outside the concrete tower base.
>
> Joe
>
> On 4/18/2017 8:05 AM, [hidden email] wrote:
>> Message: 3
>> Date: Mon, 17 Apr 2017 21:32:02 -0600
>> From: "Doug Renwick"<[hidden email]>
>> To: "'Elecraft Reflector'"<[hidden email]>
>> Subject: Re: [Elecraft] OT: Ground rods and concrete
>> Message-ID: <191B5755E4654B65951378A9EF28A8F1@DOUG8PC>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> That myth refuses to die. I have 5 concrete tower bases with ground rods
>> partially encased and never a worry about an exploding base.
>>
>> Doug
>
>
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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