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