What is the minimum acceptable size of conductors for multi conductor cables?

The minimum acceptable size of conductors for multi-conductor cables is 24 AWG. This wire gauge is commonly used in various electrical and low-voltage applications, including fire alarm systems, because it provides a good balance between resistance to current flow and flexibility for installation purposes.

Using a conductor size that is too small can lead to increased resistance, which may cause voltage drops that can affect the performance of devices within the system. Conductor sizes larger than this typical minimum can support longer runs and reduce the likelihood of issues related to heat generation and signal integrity.

While other gauge sizes like 26 AWG, 28 AWG, and 30 AWG may be used in specialized applications, they do not provide the same level of performance or safety reliability required for fire alarm systems. For fire alarm installations, ensuring the correct sizing of conductors is essential for the reliability and effectiveness of the system, as it impacts both the devices' power requirements and their operational integrity.