Re: Faraday Cage Painted (fwd)

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---------- Forwarded message ----------
Date: Fri, 18 May 2007 04:21:29 -0400
From: Dave Pierson <davep@xxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Faraday Cage Painted (fwd)


>Subject: RE: Faraday Cage Painted (fwd)
>
>Also with respect:
>
>I was under the impression, due to the
>message text, that what was in question
>was the definition of continuous ground
>bonding.  In such case the NEC does indeed
>become the final word.
    Its the word 'conticuous'.  For RF it means, roughly,
    edges of walls bonded at less than 1/10 wavelength interval.
    For NEX it means (roughly) 'continuous conductive path'.
 
>Although RF does indeed act differently,
>(no doubt about it), it is also covered
>by sections of the NEC, as I have been
>forced to find out on so many code tests.
>(its not all about power distribution wiring)
>
>If some erratic neighborhood kid runs wildly
>into a streamer the second your head is turned,
>the resulting investigation isn't going to be
>questioning if your safety system was set up
>to be "coiler's code" legal... they'll be
>looking to see if it was NFPA/NEC legal.
>--
>Christopher 'CajunCoiler' Mayeux, MsEE
>Panama City, FL
    Another complication, perhaps, is purpose of Faraday cage.
      If to keep bolts/discharges inside, then NEC style bonding
      likely OK.
      If to keep harmonics (higher freq strays in), then linear
      (continuous) bonding of edges likely indicated.
    Similarly NEC bonding can be achieved with 'lengths' of wire.
    Same lengths of wire, at some (higher) freqs become ineffective
    conductors, thus, not RF 'bonds'.

    best
     dwp