I have found that customers who want to wire it themselves generally want to save money. This sort of documentation takes enough time that the charge for it to those customers will probably be too much. If they dio not want to pay for two hours of installation, they will not want to pay for one hour of computer time (which could very easily be two or three for a wiring diagram, even of a simple system).

When we sense that price is a prime consideration, we will plan and execute an installation without spending our time (which is money, after all) to create these documents for ourselves. A short verbal descriptions of the way we usually do things, stored in their folder, suffices.

When we and the client are going all out to do things right, we walk onto the job with Visio layout illustrations, but we still do not make connection diagrams.

When I ran a crew of four men building retail audio/video switching systems for a retail chain, one of these men was employed about half-time (hand) making the block diagrams of how all the signals were routed from switching circuit board to circuit board. I would say that 10% to 15% of the project time was spent just making rudimentary wiring diagrams! I guess Visio is faster, but you still have to figure out how and where to draw all the lines so that they are clear...you want them nicely spaced...you want them to be in some order...and all of this takes time because you cannot just sit down and squirt it out of your brain.