Dịch vụ & Phân phốiCâu 55 / 521
As a general rule, how many sets of service-entrance conductors may supply each service drop or lateral?
a.Up to six sets
b.One set (with listed exceptions)
c.Two sets always
d.Unlimited sets
Giải thích
Per 230.40, each service drop/lateral generally supplies only one set of service-entrance conductors, with specific exceptions (e.g., multiple-occupancy buildings). 'Two always,' 'up to six,' and 'unlimited' misstate the general rule.
Trích dẫn luật: 2023 NEC §230.40Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- As a general rule, how must a panelboard be protected against overcurrent?
- What is the minimum depth of working space in front of a 120/240 V panelboard (Condition 1, exposed live parts on one side)?
- Service-entrance conductors must have an ampacity not less than which of the following?
- Overhead service-drop conductors passing above a residential roof that is not readily accessible generally must maintain what minimum vertical clearance above the roof?
- Under the 10-ft feeder tap rule, the tap conductors must have an ampacity not less than what value relative to the load and the device they supply?
- Where service-entrance conductors are run in parallel in separate raceways, how is the supply-side bonding jumper sized in each raceway?
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