I know variations of this question have been asked (the closest I could find is here), but I'm still confused.
@Tester101 explained if the existing feed to the subpanel is 3 wire with a grounded neutral and two hots and is not electrically connected to your main panel, your sub should have a bonded ground/neutral.
Is this an acceptable way to ground the sub panel? My sub panel is not at all connected to the main except by the 3 service conductors and has the neutral and ground bus separate. The ground bus is grounded to the earth (2 rods), gas, and water. Now I've read that this is very dangerous as the earth is not a low enough resistance for grounding (makes sense).
I read the code that Tester101 linked to in the post above but didn't see where it said to bond the ground to neutral in the sub
I guess what I'm most interested in is a good explanation about why it would be okay to bond the neutral and ground within the sub panel in this type of situation when every other time it's a big no no.
I live in Oregon for the record.