Grounding a NEMA 3R House Panel in a Condo Complex

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jt700

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Waltham,MA
I need to replace a 100amp 240 Volt NEMA 3R house panel and meter.

This 100 amp service (House panel) is attached to the exterior side of a condo unit which has its own 200 amp service. It appears that the grounding conductor for the house panel enters the adjacent condo unit and hits the water pipe of the condo unit for its ground. Currently, this is the only grounding means for the house panel.


I was going to drive new ground rods when I replace the house panel service, but do I have to hit that water pipe in the condo unit again? The existing grounding conductor will be to short to reconnect, I wasn't sure if I even had to run a new one. Is it even code compliant to hit that condo unit's water pipe?
 
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