Not sure which type of security or alarm cable your facility or system needs? Hopefully, these answers to common questions can help! What cable is used for alarm systems? Security and alarm systems are usually wired with small-gauge wire specifically designed for the purpose. For instance, many security systems are wired with 12 and 18 AWG gauge alarm wire, as these low-voltage applications do not necessarily require larger, heavier wires. However, larger or wire gauges may be required depending on the circumstances. Also, there are some unique requirements for some systems. For instance, fire alarm cables must be made with specific insulation that is heat resistant and which does not produce toxic smoke when burned. What gauge cable do you need for alarm systems? Only your specific system requirements can answer that question, but often large wire gauges (that is, smaller wires) are used as security and alarm cables because of the low-voltage, low-current application. What is ...