[TowerTalk] [Bulk] Re: [Bulk] Re: RF Ground is a Myth

[Grant Saviers]

Again, it depends.  Works for your slab integrated with footings. 
However, my slab has a thermal break to the footing since the slab has 
the radiant heating in it, plus a vapor barrier and 2" of foam.

Grant KZ1W


On 1/20/2015 7:39 AM, Jim Lux wrote:
> On 1/20/15 7:13 AM, Grant Saviers wrote:
>> If your house slab was installed correctly with a vapor barrier and/or
>> foam insulation, then it is insulated electrically from earth.
>
> In the middle, yes.. so it forms a big capacitor plate.
>
> But, around the edges, your slab is still in contact with the soil.  
> My house slab is about 50 feet long and 30 feet wide, so I've got 260 
> running feet of contact, with at least 1 foot of concrete exposed.
>
> I can't remember exactly how deep the footing edges go, but it's about 
> 12-18" and at least 8" wide, then it pops back up to the 4" thick post 
> tension slab in the middle.  Only the 4" slab part has the vapor barrier.
>
>
>
>
>
>> Tower bases make good Ufers as do perimeter foundations, so my towers
>> and shop both had the rebar set as Ufers when constructed.
>> I also noticed that a new service transformer I had installed is set on
>> a concrete vault that has a ground stub cast into the side.  The power
>> company used it, no ground rods.  I'd estimate its surface area in
>> contact with earth as more than 16 sq ft.  Compare that to less than 2
>> sq feet for a 10' 3/4" ground rod.
>>
>
>
>
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