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The only rules you should feel free to violate are the rules about having a subject (which is implied), and possibly the trailing period of the sentence. All of the remaining rules should apply. Fo...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/22153 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The only rules you should feel free to violate are the rules about having a subject (which is implied), and possibly the trailing period of the sentence. All of the remaining rules should apply. For example, these three sentences from your examples should be logical enough for the average human. > Do not open while powered on > > Disconnect power before servicing > > Do not clean with water or explosive chemicals Note that in all three cases, there is no subject. The subject is implied by label placement: we can (and usually do) naturally assume that the label is intended for the device it is affixed to. Also, we don't generally say _why_ you shouldn't do something, partly because it's usually obvious (e.g. power is usually shocking, explosive chemicals tend to... explode), and partly because we don't want to have people trying to do risk assessment without proper training. A trained professional _may_ choose to violate the warnings because they know what can go wrong, how to avoid things going wrong, and how to minimize damages when things go wrong.