Thiết bị & Hệ thốngCâu 268 / 521
Under NEC 430.102(B), where must the disconnecting means for a motor generally be located?
a.At the service equipment only
b.At least 50 ft from the motor
c.Anywhere in the building
d.In sight from the motor location and the driven machinery
Giải thích
NEC 430.102(B) requires a disconnecting means in sight from the motor and the driven machinery (with limited exceptions where a lockable disconnect elsewhere is permitted). 'In sight' means visible and not more than 50 ft away. Service-only or remote-only placement does not satisfy the rule.
Trích dẫn luật: 2023 NEC §430.102Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A 45 kVA, three-phase transformer has a 208 V secondary. What is the rated secondary current?
- Why must a motor circuit have both overload protection AND short-circuit/ground-fault protection?
- A 30 HP, 460 V, three-phase motor has an FLC of 40 A. What is the minimum ampere rating of the motor disconnecting means (115% of FLC)?
- Per NEC Table 430.248, what is the full-load current of a 3 HP, single-phase, 115 V motor?
- For the 3 HP, 115 V single-phase motor (FLC 34 A), what minimum branch-circuit conductor ampacity does NEC 430.22 require?
- Using NEC Table 430.250, what is the full-load current of a 50 HP, 460 V, three-phase motor?
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