Thiết bị & Hệ thốngCâu 323 / 521
Transfer equipment for an optional standby system must do what regarding the normal and standby sources?
a.Allow the generator to backfeed the utility freely
b.Prevent inadvertent interconnection of the normal and standby sources
c.Require no interlock between sources
d.Always be an automatic type
Giải thích
Section 702.5 requires transfer equipment to prevent the inadvertent interconnection of the normal source and any optional standby source, unless the installation is designed for parallel operation per Article 705. Allowing free backfeed to the utility would endanger line workers; optional standby transfer equipment may be manual or automatic.
Trích dẫn luật: 2023 NEC §702.5Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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