Junction boxes used in sensitive electronic equipment systems shall be clearly marked to indicate _____. a) the system frequency b) the system voltage c) the distribution panel d) b and c See answer and applicable Code reference The correct answer is: d) b and c Article 647 covers the installation and wiring of separately derived systems operating at 120V line-to-line and 60V line-to-ground for sensitive electronic equipment. As noted in 647..4(B), "All junction boxes ...

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