Services, Grounding & BondingCâu 51 / 120
What is the maximum number of service disconnecting means permitted for a single set of service-entrance conductors?
a.Eight
b.Two
c.Four
d.Six
Giải thích
Up to six service disconnects are permitted, but current code requires them to be in separate enclosures or in a listed assembly with individual disconnects, each marked as a service disconnect. Two and four are below the ceiling but are not the code maximum, and eight exceeds the limit.
Trích dẫn luật: 2023 NEC §230.71Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A metal underground water pipe qualifies as a grounding electrode only if it is in direct contact with the earth for at least what length?
- A concrete-encased electrode may be formed by at least 20 feet of which of the following?
- When a metal underground water pipe is used as a grounding electrode, what else is required?
- What is the minimum service disconnecting means rating for a one-family dwelling?
- What is the minimum clearance above a residential driveway for overhead service conductors limited to 150 volts to ground?
- Overhead service conductors must maintain what minimum clearance from a window that is designed to be opened?
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