ground resistance [RE-wrenches]

[Bill Brooks]

Jay,

I'm sure you could use a power supply, set the current output at 15 amps,
then test the voltage drop from the frame to the grounding electrode system.
R = V/I --that would seem how UL would do it. I forget what their resistance
limit is to be called "effectively grounded", but I believe it is somewhere
around 100 milliohms. Try it and let us know what you find.

Bill.

-----Original Message-----
From: Jay Peltz, Peltz Power [mailto:jay at asis.com]
Sent: Wednesday, April 23, 2003 4:28 PM
To: RE-wrenches at topica.com
Subject: Re: ground resistance [RE-wrenches]


Hi Bill,

Theres got to be some easy way.  Maybe not the best way, but what about
using a power supply or some way to attempt to induce current?

jay
----- Original Message -----
From: "Bill Brooks" <billb at endecon.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, April 23, 2003 12:42 PM
Subject: RE: ground resistance [RE-wrenches]


> Jay,
>
> Grounding system tests are not often done in the field (frame to ground
> resistance). The only way a reading has any validity is if the resistance
> measurement is made at full ground current. Continuity or resistance
checks
> at zero current is almost meaningless. As soon as current flows,
resistance
> of all connections change--particularly simple metal-to-annodized aluminum
> contact.
>
> Bill.
>
>
> -----Original Message-----
> From: Jay Peltz, Peltz Power [mailto:jay at asis.com]
> Sent: Wednesday, April 23, 2003 8:11 AM
> To: RE-wrenches at topica.com
> Subject: ground resistance [RE-wrenches]
>
>
> HI Bill and John,
>
> In checking exsisting systems for ground bonding to mounting frames, what
> readings should I be looking for.  IE whats too high?
>
> Thanks,
>
> jay
>
> Peltz Power
>
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