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That famous line from Casablanca was uttered by a police officer (Captain Renault) who was closing down Rick’s Cafe. Rick asked on what ground. The line ended with, “...to find that gambling is going on in here.” After he says that, one of Rick’s employees hands him his winnings.
The word “ground” came right after “shocked" in the movie. What many electrical workers don’t understand is the fact that these words, but with different meanings, can easily come in that order in real life.
Grounding something does not eliminate the potential of a shock hazard. People who work as though it does can find themselves shocked, shocked, but (unlike Captain Renault) not handed any winnings.
The theory behind “grounding eliminates any chance of shock” is that electricity somehow takes the path of least resistance. This theory directly contradicts Kirchoff’s Law of Parallel Circuits. And if it were true, none of today’s electronic devices would function. At all.
Electricity is always trying to get back to its source. But it doesn’t have the intelligence to test the various paths before it, determine which one has the least resistance (or impedance), and decide to ignore all paths except that one. Electricity takes all paths before it, in inverse proportion to the impedances of the paths. Water flows this same way. Use isolation, not grounding, to prevent shock.
Source: Mark Lamendola | Mindconnection