The markings required on signs and outline lighting systems in 600.4(A) and listing labels are required to be visible after installation, as well as during servicing.
See answer and applicable Code reference
The correct answer is: b) False
Article 600 covers the installation of conductors, equipment, and field wiring for electric signs and outline lighting. As specifically noted in 600.4(C), "The markings required in 600.4(A) and