Over the years I have learned that my customers who are willing to pay for the labeling want and prefer the wires to be labeled in a common-sense fashion. I try to label so that even a novice with wires can understand it. This is not always easy but once you get a system it becomes easier.
Common sense labeling on a boat means that each label is wired as "TO" or "FROM" and the device, load, panel, charger, panel etc. that corresponds with that wire.
In this photos you can see how easy it is to determine what goes where and what comes from where. If you needed to find the in-line fuse for the Balmar Duo Charger it would take two seconds to find.
For those of you that are marine electrical professionals, this also makes over the phone trouble shooting considerably easier when your customer has an issue in a far and distant location from where you are. These little details go a long way towards your customers overall satisfaction with you and your work, and should turn into referrals. How many boaters know how to read a wiring diagram or even could locate it on the boat..?
I like common sense labeling, where it is appropriate.