What type of ground rods are hydrant outlets grounded to in the type 2 piping system?

In a type 2 piping system, hydrant outlets are grounded to galvanized or stainless steel ground rods. This choice is correct because these materials are resistant to corrosion and capable of maintaining their conductive properties over time, which is critical for effective grounding. The grounding system is essential for safe operation, as it helps to dissipate any electrical surges and reduce the risk of electrical hazards at the hydrant outlets.

Galvanized steel, which is coated with a layer of zinc, provides an additional layer of protection against rust and environmental factors that can degrade grounding effectiveness. Stainless steel, being inherently resistant to corrosion, also serves the same purpose. In settings where safety and reliability are paramount, using these materials ensures that the grounding system remains functional for an extended period.

Other materials like tin, cast steel, and black iron may not have the same level of corrosion resistance or electrical conductivity required for effective grounding in a moisture-saturated environment, which is common around hydrants, making them less suitable for this application.