Dịch vụ & Phân phốiCâu 69 / 521
The main bonding jumper in service equipment serves to:
a.Connect the grounded conductor to the service equipment enclosure
b.Connect two grounding electrodes together
c.Bond the metal water pipe to the gas pipe
d.Provide overcurrent protection for the neutral
Giải thích
Per 250.28, the main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and metal enclosure at the service, establishing the fault-return path. It is not a jumper between electrodes, a piping bond, or any form of overcurrent protection.
Trích dẫn luật: 2023 NEC §250.28Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A feeder overcurrent device protecting a feeder that supplies continuous loads must have a rating not less than:
- A service is supplied with 3/0 AWG copper service-entrance conductors. Using Table 250.66, the minimum size copper grounding electrode conductor is:
- At a grounded AC service, the grounded (neutral) conductor run to the service disconnecting means must be sized:
- A feeder is protected by a 100 A overcurrent device. Using Table 250.122, the minimum size copper equipment grounding conductor is:
- At other than dwelling units, service equipment must be legibly field-marked with:
- The interrupting rating of an overcurrent device must be:
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