Dịch vụ & Phân phốiCâu 12 / 521
What is the general rule for the metal water piping system inside a building served by an electrical service?
a.It must be left isolated from the grounding system
b.It may only be grounded through a water heater
c.It must be used as the sole grounding electrode
d.It must be bonded, sized per Table 250.102(C)(1)
Giải thích
Per 250.104(A), interior metal water piping must be bonded to the service grounded conductor/enclosure or GEC, with the bonding jumper sized from Table 250.102(C)(1). Isolation is prohibited, and water pipe alone cannot be the sole electrode.
Trích dẫn luật: 2023 NEC §250.104(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Service-entrance conductors are 3/0 AWG copper. Per Table 250.102(C)(1), what is the minimum copper main bonding jumper?
- When the grounded (neutral) service conductor is run to the service disconnect, its minimum size is based on which table?
- Ungrounded conductors are increased in size for voltage drop. What must happen to the equipment grounding conductor?
- What is the function of the main bonding jumper at a service?
- Where two rod electrodes are used to meet the supplemental-electrode rule, what is the minimum spacing between them?
- Using the 75 C column of Table 310.16, what is the allowable ampacity of a 3/0 AWG copper conductor?
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