Dịch vụ & Phân phốiCâu 109 / 521
A detached garage is supplied by a feeder from the main dwelling. At the garage, the code generally requires:
a.No grounding electrode because the feeder has an equipment grounding conductor
b.The neutral must be bonded to the enclosure like at a service
c.A grounding electrode (or electrode system) to be installed and connected to the building disconnect, with the equipment grounding conductor run with the feeder
d.Only a single ground rod with the neutral used as the ground
Giải thích
Per 250.32, a building or structure supplied by a feeder must have a grounding electrode connected to the equipment grounding terminal at the disconnect, and an equipment grounding conductor must be run with the feeder while the neutral remains isolated. Re-bonding the neutral downstream (the old exception) is no longer generally permitted.
Trích dẫn luật: 2023 NEC §250.32Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A panelboard must have a rating (busbar ampacity) not less than:
- Service-entrance conductors installed in a raceway in a wet location (such as underground or exposed to weather) must be:
- A separately derived system (such as the secondary of a transformer feeding a distribution panel) must have a system bonding jumper connecting:
- On a 4-wire delta system where the midpoint of one phase is grounded, the conductor with the higher voltage to ground (the high leg) must be durably and permanently marked, typically colored:
- A service raceway enters a building from an underground distribution system. To prevent moisture and gases from entering, the raceway must be:
- Where multiple service disconnects are installed under the 2023 NEC, the general requirement (compared to older editions) is that they be:
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