Question
Which of the following is required for lightning protection ground rods?
Answer Options
- A) They must be bonded to all buried water and gas lines
- B) Bends in ground wires must be made as close as possible to a right angle
- C) Lightning grounds must be connected to all ungrounded wiring
- D) They must be bonded together with all other grounds
Correct Answer: D
Explanation
For effective lightning protection, all ground systems (including AC electrical ground, antenna grounds, and station safety grounds) must be interconnected. Lightning energy will travel the path of least impedance, and disparate ground systems can create dangerous voltage differences.
The requirement for lightning protection ground rods is that They must be bonded together with all other grounds using short, heavy conductors. This creates a single point of entry to the earth, minimizing the potential for side flashes or dangerous voltage differentials between different metal systems.
This is a requirement of National Electrical Code (NEC) 810.21, which may be supplemented by state and/or local requirements. More resources:
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