Services, Grounding & BondingCâu 53 / 120
What is the minimum clearance above a residential driveway for overhead service conductors limited to 150 volts to ground?
a.18 feet
b.10 feet
c.12 feet
d.15 feet
Giải thích
Residential driveways and commercial areas not subject to truck traffic require 12 feet of clearance. The 10-foot clearance applies only above finished grade, sidewalks and platforms accessible to pedestrians, and 18 feet is required over public streets, alleys and roads.
Trích dẫn luật: 2023 NEC §230.24(B)Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- When a metal underground water pipe is used as a grounding electrode, what else is required?
- What is the maximum number of service disconnecting means permitted for a single set of service-entrance conductors?
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- Overhead service conductors must maintain what minimum clearance from a window that is designed to be opened?
- Ground-fault protection of equipment is required for a solidly grounded wye service with more than 150 volts to ground when the disconnect is rated at least what value?
- How must a panelboard be protected against overcurrent?
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