Where in the code book does it require 2 ground rods ?

250.56

Two rods are not required, but they are typically done to avoid having to test for resistance, or if the required resistance is not met.

A State Electrical Inspector may require more than one rod as a rule in that state.

Depends what city/state you're in. Here usually they just put one ground rod and run the ground wire to the cold water pipe and the ground rod.

Los Angeles Electrician

Quote:

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Originally Posted by Branover

Depends what city/state you're in. Here usually they just put one ground rod and run the ground wire to the cold water pipe and the ground rod.

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This may be true for your area, but he asked where it was in the code book.