Re: [Elecraft] Elecraft Digest, Vol 69, Issue 40

[tom kenville]

Folks,

It is best not to rely on water pipes for any type of grounding.

Many homes have various combinations of steel, copper, plastic, etc. piping.
These are electrically discontinuous, often with purposefully inserted
"galvanic isolators".

The best ground is a proven, direct ground.
Bonding of all electrical grounds to the common feed-point ground is required.

You risk too much with the chance of holding a mike and touching
another piece of non-ham equipment.

tom -- w6tjk

From: David Christ <[hidden email]>

> Subject: Re: [Elecraft] Grounding negative side of power supply?
> To: [hidden email]
> Cc: [hidden email]
> Message-ID: <p0624080fc77e08e1b6ae@[10.0.1.3]>
> Content-Type: text/plain; charset="us-ascii" ; format="flowed"
>
> Another commonly used ground is the water system.  Check your water
> meter.  If there is a heavy jumper around it, chances are the
> grounding wire from the service entrance connects to the cold water
> system.
>
> David K0LUM
>
> At 7:17 AM -0500 1/21/10, Jim Miller wrote:
>>In many US homes the utility ground is found inside the home as it is a
>>ground rod embedded in the poured concrete foundation immediately below the
>>power panel.
>>
>>73
>>
>>jim ab3cv
>
>

thanks and 73's
Tom Kenville  --  W6TJK
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[Jim Brown-10]

On Thu, 21 Jan 2010 20:35:02 -0800, tom kenville wrote:

>It is best not to rely on water pipes for any type of grounding.

RIGHT! And that has NEVER been acceptable practice. NEC and other
electrical codes REQUIRE that there be at least one driven rod
for the electrical system ground, and a second if the impedance
to earth of that rod is greater than 25 ohms. In most locations,
that means two rods. In addition, NEC and other electrical codes
require that the rod(s) be augmented by bonding the electrical
system ground to all metallic plumbing, all building structure,
and all other grounded objects.

73,

Jim K9YC


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