Electrician Red Seal · Question
A utility pole carrying 14.4 kV primary distribution lines has multiple ground rods driven at its base. What is the maximum permissible resistance to ground for the grounding electrode system at this location, according to Canadian Electrical Code (CEC) Rule 10-100?
CEC Rule 10-100(1) specifies that a grounding electrode system for supply circuits operating at more than 750 V (such as 14.4 kV) shall have a resistance to gro
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Question: A utility pole carrying 14.4 kV primary distribution lines has multiple ground rods driven at its base. What is the maximum permissible resistance to ground for the grounding electrode system at this location, according to Canadian Electrical Code (CEC) Rule 10-100?
Answer options: ✅ 5 Ohms
- 10 Ohms
- 25 Ohms
- Depends on soil resistivity, no fixed maximum
Correct answer: 5 Ohms
Explanation: CEC Rule 10-100(1) specifies that a grounding electrode system for supply circuits operating at more than 750 V (such as 14.4 kV) shall have a resistance to ground not exceeding 5 Ohms. This lower resistance provides a more effective path for high-voltage fault currents.
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