Dịch vụ & Phân phốiCâu 81 / 521
Which type of surge-protective device is permitted to be connected on the line side of the service overcurrent device (service disconnect)?
a.Type 3
b.Type 4
c.Type 1
d.Type 2
Giải thích
Per Article 242, a Type 1 SPD is permitted to be connected on the line side of the service disconnect overcurrent device. Type 2 devices are connected on the load side of the service disconnect, and Type 3 are point-of-utilization devices installed near equipment.
Trích dẫn luật: 2023 NEC §242.14Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Each panelboard must be protected by an overcurrent device having a rating:
- Under the 2023 NEC, the maximum number of overcurrent devices permitted in a lighting and appliance branch-circuit panelboard is:
- Under the 2023 NEC, the service supplying a dwelling unit must be provided with a:
- A concrete-encased electrode (Ufer) must consist of at least 20 ft (6.0 m) of:
- A single made rod electrode is measured at 40 ohms resistance to earth. The code requires that it be:
- Overhead service conductors (service drop) over a residential driveway with no truck traffic must maintain a minimum vertical clearance above grade of:
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra