Thiết bị & Hệ thốngCâu 318 / 521
For an optional standby system, what signage does the NEC require?
a.No signage is required
b.A sign only inside the generator enclosure
c.A sign only if the system is over 600 volts
d.A sign at the service-equipment location indicating the type and location of the on-site optional standby power source
Giải thích
Section 702.7 requires a sign at the service-equipment or grounding-electrode location indicating the type and location of each on-site optional standby power source. This warns anyone working on the service that a second source of supply exists; signage is not limited to high-voltage systems or the generator enclosure.
Trích dẫn luật: 2023 NEC §702.7Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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