In Group 3 flame effects, which feature is required?

• A. An Automatic Ignition Circuit
• B. A Manually Controlled Fuel Valve Only
• C. Two Fuel Shutoff Valves, One Of Which Is A Safety Shutoff Valve
• D. No Fuel Shutoff Required

Answer: (C)

Redundancy and a fail-safe shutoff are essential when working with Group 3 flame effects. The system must have two fuel shutoff valves, and one of them has to be a safety shutoff valve. This arrangement lets you instantly stop fuel flow in an emergency or if the control system fails, while still providing a separate valve for normal operation and for purge purposes. The safety shutoff is designed to close automatically when power or control signals are lost, preventing continuous fuel flow to the burner. Having both valves gives you a reliable means to isolate and depressurize the fuel line, perform maintenance, and ensure no fuel remains in the line before re-lighting. The other options don’t meet these safety needs: a single automatic ignition circuit doesn’t stop fuel flow, a manual valve alone lacks automatic fail-safe capability, and having no fuel shutoff is unsafe and non-compliant.