I have a main service panel with two breakers: the main service breaker and a single large breaker to another subpanel in the same structure.
All other circuits are serviced from the subpanel.
My understanding of NEC is that each panel requires two grounding rods at least 6 feet apart.
My home uses PEX but there is a copper main coming in on the opposite side of the crawlspace.
Do I need two full ground rods per panel? So four, total, rods?