An toànCâu 444 / 521
The purpose of the main bonding jumper at a service is to:
a.Connect two separate service panels together
b.Bond the neutral bar only to the ground rod
c.Connect the equipment grounding conductor/metal enclosure to the grounded (neutral) conductor at the service
d.Carry the lighting load for the building
Giải thích
The main bonding jumper ties the equipment grounding system and service enclosure to the grounded (neutral) conductor at the service, completing the fault path back to the source. It is not a tie between two panels, not merely a neutral-to-rod link, and it never carries normal load current.
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
- The primary safety purpose of equipment grounding (bonding metal enclosures to the equipment grounding conductor) is to:
- Which statement about the grounded (neutral) and equipment grounding conductors is correct?
- A single ground rod electrode that does not achieve a resistance to earth of 25 ohms or less must be:
- An excavation or trench that is how deep generally requires a protective system (sloping, shoring, or shielding) unless it is entirely in stable rock?
- Who must inspect an excavation for hazards (before each shift and as conditions change) and classify the soil?
- Excavated soil (spoil) and equipment must be kept at least how far back from the edge of a trench?
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