I usually run GEC to one of the service disconnects (the one that requires the largest GEC if there are those kind of diffferences).I then run tap conductors from each other service disconnect to the GEC.If you have multiple electrodes you must have unspliced GEC to one of the electrodes, but the others can be connected via bonding jumpers.
• I usually run GEC to one of the service disconnects (the one that requires the largest GEC if there are those kind of diffferences).
250.64 ( C ) (2) could be interpreted as such -- or run to a buss bar with the continuous EC & then individually to each disconnect is the most common ( the max 6 switch service is grouped)
• 250.64 ( C ) (2) could be interpreted as such
With multiple disconnects ( service) can the grounding electrode IE cold water ,ground rod ,bldg Steel be Daisy chained from 1 disconnect to the next then to the electrode?
No.
and why would you want to involve all the unaffected equipment in the chain as the current path to the grounding electrode (s)
250.64 Grounding Electrode Conductor Installation.
• shall be installed as specified in 250.64(A) through (F).
(D) Service with Multiple Disconnecting Means Enclosures. Where a service consists of more than a single enclosure as permitted in 230.71(A), grounding electrode connections
• shall be made in accordance with (D)(1), (D)(2), or (D)(3).
Keep 250.24 in mind as well:
250.24 Grounding Service-Supplied Alternating-Current Systems.
(4) Main Bonding Jumper as Wire or Busbar. Where the main bonding jumper specified in 250.28 is a wire or busbar and is installed from the grounded conductor terminal bar or bus to the equipment grounding terminal bar or bus in the service equipment, the grounding electrode conductor shall be permitted to be connected to the equipment grounding terminal, bar, or bus to which the main bonding jumper is connected.
• Where the main bonding jumper specified in 250.28 is a wire
• Where the main bonding jumper specified in 250.28 is a busbar
Before you land your grounding electrode to the service equipment metal enclosure with a lug.
Or land your grounding electrode to the equipment ground buss that uses the metal enclosure as a current path to the service grounded conductor.
The green screw you commonly see bonding the Neutral to the metal enclosure and the metal enclosure as the current path to the equipment ground buss is not the allowed path for the grounding electrode conductors current back to the grounded conductor.