Now have run 3 wire and ground to a detached garage (PVC) and wondering what the correct method is for bonding the panel to earth (ground rod or water pipes)? Is there a standard fitting for exiting the service panel/exterior wall with the ground wire to the ground rod? Instead of using a ground rod can I bond to the water pipes? Is this also to be done outside the dwelling? Water pipes are a fair distance from the house where the wiring to the garage originates.