The type of signal wiring used to interconnect ATS's with a fire alarm system can vary depending on the specific requirements and specifications of the project. However, some common types of signal wiring used for this purpose include: #18 AWG stranded copper wire

This is a commonly used wire size for low-voltage signal applications, including fire alarm systems. It provides a good balance of flexibility and current-carrying capacity.

#22 AWG stranded copper wire

This is a smaller wire size that may be used when space is limited or when the signal current is relatively low.*

Fire-rated cable: This type of cable is specifically designed to maintain its integrity and functionality in the event of a fire. It may be used in areas where fire protection is a critical consideration.The specific signal wiring requirements should be clearly outlined in the project specifications or drawings. It is important to follow these specifications carefully to ensure proper operation and compliance with applicable codes and standards. Flag for review