The wiring (not included) from the power source to the positive wire of the power wiring harness must run through a circuit breaker or in-line fuse (not included) as close to the power source as possible. See the ABYC or your local and regional standards for the required fuse or breaker rating. Connecting the device to power without a circuit breaker or in-line fuse may cause a fire if there is a short in the cable, resulting in property damage and/or serious personal injury.