We recently did a service panel upgrade, added a breaker that goes to the subpanel in the garage, installed two ground rods, connected the ground rod to a cold water pipe, bonded the cold-hot-gas pipes at the water heater.
Is there a way for me to test that this is all done correctly...i.e. there's a continuous path to the grounding rods.
Do I use a multimeter and test for continuity? Do I measure potential? If I were to do the above, at what points would I do it in the path/circuit?
How do I test that the subpanel in the garage is grounded correctly?