Practice question

What type of ground rod is typically required for traffic signal grounding per NEC requirements?

  1. Aluminum rod, 6 feet long, 1/2 inch diameter
  2. Copper-clad steel rod, 8 feet long, minimum 5/8 inch diameter
  3. Galvanized steel rod, 4 feet long, 3/4 inch diameter
  4. Stainless steel rod, 10 feet long, 1/2 inch diameter

Answer: B — Copper-clad steel rod, 8 feet long, minimum 5/8 inch diameter

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