Under Article 37, which of the following is a stated requirement for fire-fighters' switches for luminous tube signs?

• A. The switches must be located only on the ground floor
• B. They must be installed only by the manufacturer
• C. There must be a cut off switch
• D. The switches must be blue in color

Answer: (C)

Having a cut-off switch is essential because it lets firefighters rapidly disconnect the power to luminous tube signs during an incident. This quick isolation protects them from electric shock and reduces the risk of electrical heat or faults while they operate in smoky or dangerous conditions, helping to prevent the sign from continuing to energize unexpectedly. The standard is focused on ensuring there is a means to shut off power readily, not on where the switch must be located, who installs it, or what color it is. The other possibilities don’t align with the safety purpose of enabling immediate de-energization.