Well im working on a ground up Auto shop and am currenlty installing the slab on grade on site - the engineer is asking for 6" seperation between the power and signal system conduits - in some areas however this seperation cannot be maintained and i just wanted to make sure that once i energized the power it wont interfer with the low voltage system ( telephone, data, speaker, fire alarm, security ) - i know that harmonics sometimes can cause minor problems - i would like to know what type of problems if any may occur and some solutions if that happens. any type of info. would be greatly appreciated.