John Gilmer wrote:
Before you complete the bonding connection, check the resistance between
your "proper" ground and your re-bar. If you have time on your hands,
drive a second "proper" ground rod (two "proper" grounds rods will meet NEC
requirements) and measure the various resistances. You may find that the
re-bar is a better ground than the "proper" ground.

Measure the (AC) voltage difference before you measure the resistance. If it's
not zero, don't measure the resistance. Two ground rods some distance apart typically
have a voltage difference between them even if not attached to anything, but especially
if one is in use and the other isn't.
--
Ron Hardin


On the internet, nobody knows you're a jerk.