[TowerTalk] Fwd: grounding (again)

jimlux jimlux at earthlink.net
Mon Apr 23 15:01:58 EDT 2018

On 4/23/18 11:13 AM, Patrick Greenlee wrote:
> Aluminum flashing is wide (low inductance) and can easily be cut to a 
> custom width if required.

The problem with flashing and rectangular bars, of all materials, is 
that it's convenient for some kinds of connections (flat bolted), but 
not particularly convenient for routing.

 From a "I have to bond this flat plate with a bunch of connectors" 
standpoint, I think a standard crimp lug on stranded wire is probably 
easiest *if you have the tools*.  Ditto for stacking on a antenna tower 
bolt, etc.

If you don't have the right crimping tool, then it's a bit more tough - 
so it might be worth finding someone in your area that can do the crimps 
for you.  (Welding suppliers? Solar Panel installers? A local 
electrician? I don't know..)

The cost difference between aluminum and copper is substantial on a per 
pound (or volume) basis, but how many pounds is a typical amateur 
installation doing.

Copper AWG2 insulated wire from Home Depot costs $1.22/ft in small 
lengths. Aluminum is $0.43/ft.

But, with aluminum, you do have all the corrosion, dissimilar metal 
things... If you're running 50 ft, you're looking at a cost difference 
of $40.

Another, more subtle aspect is that your friendly local inspector will 
be familiar with "wire", not with "strap".  Bolted connections, crimped 
lugs, #2 wire is something they see every day.

> Patrick        NJ5G
> On 4/23/2018 5:38 AM, Hans Hammarquist via TowerTalk wrote:
>>   Hi Tom,
>> I am using aluminum straps for my grounding runs. I found 6" wide 
>> traps in the garden department (don't remember what department store 
>> it was. Probably Walmart). The strips are use as edging around flower 
>> bads. They were on sale as it was the end of the season if i remember 
>> right. They came in rolls of 10 feet and have some means to be 
>> connected together in longer runs (although I don't think that 
>> connection is of any value from an electrical point).

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