Working Space Requirements for Electric Sign Equipment

A working space not less than 3 ft high by 3 ft wide by ______ deep is required for each ballast, transformer, electronic power supply, and Class 2 power source where not installed in a sign.

a) 2 ft
b) 3 ft
c) 4 ft
d) 6 ft

See answer and applicable Code reference

The correct answer is: b) 3 ft

Article 600 covers the installation of conductors, equipment, and field wiring for electric signs and outline lighting, regardless of voltage. As per Sec. 600.21(D), "A working space at least 3 ft high x 3 ft wide x 3 ft deep shall be provided at each ballast, transformer, electronic power supply, and Class 2 power source or at its enclosure where not installed in a sign."

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