When installing grounding electrode conductor taps to each service disconnecting means enclosure, the minimum size required is based on what?

The minimum size required for grounding electrode conductor taps to each service disconnecting means enclosure is based on the size of the largest ungrounded service conductor. This is crucial because the grounding electrode conductor must be adequate to safely carry fault current that could occur during a fault condition in the electrical system.

When determining the size, using the largest ungrounded service conductor ensures that the grounding system is capable of handling potential overloads and providing the necessary protection against electrical faults. This sizing approach aligns with established electrical codes and standards, which are designed to ensure safety and reliability in electrical installations. By basing the minimum size on the largest ungrounded service conductor, the installation can effectively mitigate risks associated with electrical faults throughout the system.