Dual fuels need permission from

• A. Fire department
• B. Gas suppliers only
• C. Fire department and both serving gas suppliers
• D. Environmental agency

Answer: (C)

When a system can operate on more than one fuel, it creates additional safety and coordination needs. Dual-fuel installations require careful planning with the authorities having jurisdiction and the fuel suppliers to ensure the correct fuel type, pressures, and shutoff arrangements are in place, and so emergency responders know how the system can be isolated.

The best answer reflects that permission should be obtained from the fire department and from all gas utilities serving the property. The fire department needs to be aware for safe emergency response and to understand how the system can be shut down, while each gas supplier must authorize the use and interconnection of their fuel, especially if more than one supply is present or if transfer between fuels could affect the supply or pressure. This coordination helps prevent backflow, incorrect fuel connections, or other hazardous conditions.