Answer:
the ground wire must be grounded.
Step-by-step explanation:
For fire alarm cable to be effective, the ground wire must be grounded. This is because grounding the wire helps to ensure that the fire alarm system is properly connected to the earth, which can help to protect against electrical surges and other issues that could interfere with the proper functioning of the system. Additionally, grounding the wire can help to prevent the build-up of static electricity, which can damage the cable or the fire alarm system itself.