As I have read in previous posts, ground rods must be installed so that there is less than 25 ohms resistance. What I want to know is less than 25 ohms between what two points? I know I'm missing something here, and this may have already been covered, but where do you measure the resistance?
Disclaimer: I'm not an EC, handy man, etc. I'm not even an EE... yet. It's not homework, and I'm not attempting to use this information to install anything. I'm ust a very curious person who has trouble googling things, and figured this is the best place to ask. :-)
