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-   -   Faraday Cage (http://www.firearmstalk.com/forums/f51/faraday-cage-73208/)

12fretter 09-26-2012 02:19 PM

Faraday Cage
 
Since grounding is a big issue with a Faraday Cage, I was wondering if you could wire up a custom AC power cord that only has the third green wire hooked up, connect it with a big ol' ring terminal to the cage, and plug it into any outlet in the house. Is that a reasonable solution?

scottmac 09-27-2012 01:02 PM

Quote:

Originally Posted by 12fretter
Since grounding is a big issue with a Faraday Cage, I was wondering if you could wire up a custom AC power cord that only has the third green wire hooked up, connect it with a big ol' ring terminal to the cage, and plug it into any outlet in the house. Is that a reasonable solution?

Grounding is not necessary for a Faraday cage; the metal is a better path than air and guides the field around the contents.

ellis36 09-27-2012 02:04 PM

Quote:

Originally Posted by scottmac (Post 956248)
Grounding is not necessary for a Faraday cage; the metal is a better path than air and guides the field around the contents.

I'm not sure about that. Check out
http://www.endtimesreport.com/faraday_cages.html

As for the question…it would depend on the integrity of the ground wires from the outlet back through the main breaker box out to the power company ground. Some unknowns there but a possible solution. The thing is, shielding for RF is an iffy thing. Because of the short wavelength a ground wire can actually act as an antenna under the right conditions. The ground needs to be as large, as short and as direct as possible.
Google 'Faraday Cages.' There is lots of info there about this subject.

JTJ 09-27-2012 05:19 PM

Your best bet is an independent ground rod if you have good mineral content in the soil. I have had to dig a trench and run a bare ground cable when I could not get a sufficient ground with a rod. Sand can be iffy.

WebleyFosbery38 09-27-2012 08:28 PM

Quote:

Originally Posted by JTJ (Post 956560)
Your best bet is an independent ground rod if you have good mineral content in the soil. I have had to dig a trench and run a bare ground cable when I could not get a sufficient ground with a rod. Sand can be iffy.

Ive built these for our scientists in our BIO labs, they have dedicated Grounding systems in the labs so its not an issue. The ground lug in your outlets isnt a great place to grab ground, they are often noisy and in older homes, very unreliable. The impedance is just as important as the pathway.

The reference to the Grounding is a very important factor in the use of a Faraday cage, I agree a well placed (Damp, minerals, deep) ground rod with a dedicated strap is best. Also, the perforations, mesh in the cage should be as small as possible to minimize penetration of Higher Frequencies. I use copper cloth, its expensive and easy to solder directly too but is nearly impenetrable.

12fretter 09-28-2012 04:56 PM

Quote:

Originally Posted by WebleyFosbery38 (Post 956747)
its expensive and easy to solder directly too but is nearly impenetrable.

Did you mean it's INexpensive?

WebleyFosbery38 09-28-2012 09:13 PM

Quote:

Originally Posted by 12fretter (Post 957685)
Did you mean it's INexpensive?

Unfortunately its not cheap to buy woven copper fabric but it is pretty much impervious unlike most other materials that cross conduction isn't so guaranteed. We use smaller versions for monitoring brain waves, Signals so small that any stray RF in the room would register.

bkt 09-28-2012 10:30 PM

Short answer: yeah, it'll work OK if your ground on your outlet actually goes to ground. Grounding usually isn't difficult. If you're in an apartment, that might be a different deal. Buy an outlet tester and confirm ground really goes to ground. If it does, modify an extension cord and you should be OK.

clr8ter 09-29-2012 12:19 AM

If it were me, I'd put the cage in the basement, drill a hole thru the concrete floor the size of a grounding rod, pound it into the ground under your house, and attach a big cable directly to it.

bkt 09-29-2012 11:50 AM

Quote:

Originally Posted by clr8ter (Post 958145)
If it were me, I'd put the cage in the basement, drill a hole thru the concrete floor the size of a grounding rod, pound it into the ground under your house, and attach a big cable directly to it.

Right, me too. But if you're living in a 5th floor apartment you might be limited doing something like that.


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