Well, one can modify it to "don't touch it unless..."

For instance, with a thorough map of which breaker does what and double-checking with the voltmeter, I can remove the danger element long enough to take apart the system I don't understand, safely.

The problem, of course, comes in turning everything back on without fire/sparks/bangs. But I have to have the 'unless' part of the rule, because I'm one of those people who has to actually take it apart and put it back together a few times to really get it.