True or False: Detectors and appliances can be mounted using wires behind them.

The statement is false because detectors and appliances should not be mounted using wires behind them. This practice could lead to several issues, such as making the devices difficult to service or replace and potentially creating a safety hazard if the wires were to become damaged over time. Proper installation requires that devices be mounted securely and in a manner that allows for easy access and ensures reliability in operation. Additionally, fire alarm codes and standards typically dictate that wiring should be managed according to specific guidelines to prevent interference, ensure functionality, and support maintenance efforts. This ensures that the fire alarm system operates correctly and maintains safety standards.