What gauge wiring does Macurco recommend for their detectors? It's best to use the wiring sizes recommended by the National Electrical Code.The recommendations are as follows:575 feet - 20 AWG686 feet - 18 AWG1300 feet - 16 AWG2100 feet - 14 AWG3200 feet - 12 AWGRelated Products:Macurco GD-2A Combustible Fixed Gas DetectorMacurco CM-6 Carbon Monoxide Detector