I am working a project using Fieldbuss cable( 2 pair twisted shield size #18). These cables will be ran in a cable tray for instrumentation cables only ( 120 volts or less). My question is, If there are any cables that have a "Digital" signal on them, will it cause any interference to the Fieldbuss cable? Also, what if any, effect does "Digital" signal have on Fieldbuss cable? Any information that you could send me would be greatly appreciated.