For load connections with a 150-A circuit breaker and 1 AWG conductors, the minimum size grounding conductor installed between the panel and the pull box is?

The minimum size grounding conductor required between the panel and the pull box for a 150-A circuit breaker with 1 AWG conductors is based on the National Electrical Code (NEC) guidelines. According to these guidelines, the size of the equipment grounding conductor is determined by the rating of the overcurrent protection device, which in this case is the 150-A circuit breaker.

For a 150-A circuit breaker, the NEC specifies that the minimum size grounding conductor should be at least 4 AWG copper or 2 AWG aluminum based on the provided tables. This ensures that the grounding conductor is adequate to safely carry any fault current that may occur, providing proper protection against electric shock and fire hazards.

The correct choice reflects the necessary conductor size needed to meet safety and regulatory standards, ensuring a reliable and safe electrical installation.