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Suggest you also get a copy of IEEE Std 80, IEEE Guide for Safety in AC Substation Grounding. Make you get the latest edition, just published.

The &quot;required&quot; resistance depends upon the type of installation. For anything following the NEC, 25 ohms is a target but not a requirement. If one electrode is over 25 ohms, add another and the resulting resistance can be anything. <br> When it comes to electronic installations...

These are IEEE standards <br> 802.3 (1998) is IEEE Standard for Informtion technology<br> <br> 802.5 (1998) is IEEE Standard for Information Technology<br> <br> These are available from IEEE at 1-800-678-4333<br> or <A HREF="http://standards.ieee.org/catalog/olis"...