An toànCâu 442 / 521
Which statement about the grounded (neutral) and equipment grounding conductors is correct?
a.They may be bonded together again at every subpanel
b.They are bonded together only at the service (or separately derived source) and kept separate downstream in subpanels
c.The equipment grounding conductor normally carries load current
d.Neutrals and grounds are effectively the same conductor everywhere
Giải thích
The neutral and equipment grounding conductor are bonded only at the service or source; downstream subpanels keep them isolated so normal load current does not flow on grounding conductors and enclosures. Re-bonding at subpanels or treating them as one conductor creates parallel neutral paths and shock hazards.
Trích dẫn luật: 2023 NEC §250.24Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Live parts operating at 50 volts or more must be guarded against accidental contact by:
- An electrical room containing exposed live parts that is accessible only to qualified persons must have:
- The primary safety purpose of equipment grounding (bonding metal enclosures to the equipment grounding conductor) is to:
- A single ground rod electrode that does not achieve a resistance to earth of 25 ohms or less must be:
- The purpose of the main bonding jumper at a service is to:
- An excavation or trench that is how deep generally requires a protective system (sloping, shoring, or shielding) unless it is entirely in stable rock?
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