We have had pretty different development of the
#1) Power
#2) Phone
#3) Data
#1) Historically the power demand has been greater, and the focus in codes has been to security.
#) Phones has worked equal for about 100 years, and the development has been in the last few years to be changing to use data communication and plug and play modules. Safety has been less in focus.
#3) Data has develloped from a transfer system using phone-lines to pretty complex solutions with a mix of fiber-optics and thin twisted copper wires. Personnel safety has not been an issue, but protecting the equipment has solved most of those issues.
By my opinion all working with one of the systems need to know thebasics of the 2 others, and then specilaze. (#2 seems to be a dying field)
dsk
