DO EMI & Video Signals Mix? No they do not.

EMI (Electromagnetic Interference) is a disturbance in an electrical circuit.  The source of EMI can be any object that contains rapidly changing electrical currents.  Almost anything that uses electricity to operate is a source of EMI.  The problem with EMI, concerning surveillance, is that it distorts video signal.  When installing a CCTV system, it’s important to run cables away from sources of EMI.  Otherwise, the video feed on the DVR will be extremely fuzzy.  This should definitely be taken into consideration when installing a surveillance system in an industrial environment.  One common source of EMI is fluorescent lighting.  Fluorescent lights are common in industrial areas.   Running cable close to these lights should be avoided at all costs.  If cabling absolutely has to be run close to fluorescent lights, then it should be ran in some type of conduit that is properly insulated and will create a barrier between the video cable and the light.