Thiết bị & Hệ thốngCâu 320 / 521
A generator disconnecting means must be capable of doing what?
a.It is optional for standby units
b.Only opening the neutral conductor
c.Disconnecting the generator and all protective devices and control apparatus, and be lockable in the open position
d.Serving as a plug and receptacle only
Giải thích
Section 445.18 requires a disconnecting means that shuts down the generator, disconnects it and all protective devices and control apparatus from the load, and can be locked in the open position. Opening only the neutral or relying on a cord-and-plug connection does not satisfy the full disconnect and lockout requirement.
Trích dẫn luật: 2023 NEC §445.18Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Transfer equipment used for an emergency system must be what?
- For an optional standby system, what signage does the NEC require?
- On a portable generator, GFCI protection for personnel is generally required on which receptacles?
- How must emergency illumination be arranged with respect to the failure of a single lighting element?
- Which loads are typically served by a legally required standby system?
- Transfer equipment for an optional standby system must do what regarding the normal and standby sources?
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