Concrete-encased electrodes must have how many conductive rebar or rods minimally?

The requirement for concrete-encased electrodes is that they must have at least one conductive rebar or rod. This is established to ensure that the concrete-encased electrode is effectively grounded and provides a low-resistance path to earth. The presence of a single rebar or rod is sufficient for achieving the necessary grounding performance in a concrete installation, as the conductive material can make direct contact with the concrete, which enhances the electrode's effectiveness.

Having only one conductive rebar or rod minimizes material and installation costs while still meeting grounding and bonding standards. Additional rebar or rods can be beneficial in some installations for enhanced conductivity but are not a requirement for a functioning concrete-encased electrode. Thus, the standard is fulfilled with the presence of just one conductive element.