Originally Posted by Fivealive
Some appliances and electronic devices may be damaged if polarity is reversed
Good. If a source is reputable, the it also said WHY. Without 'why', claims are routinely rejected as only speculation. Claims based only in observation are classic examples of junk science reasoning. Claims based only in obervation mostly come from those who do not even know how electricity works.
Any appliance damaged by reverse polarity is a major design defect. Would not get a UL listing. If someone who knows only from observation and does not also say why, well, that is how urban myths get separated from informed conclusions.
If reversed polarity causes any appliance damage, then also state why. Define the internal part damaged by reverse polarity. Otherwise it is only hearsay. If inspectapedia does not do that, then the source is best considered bogus. It must be true. I read it on the internet.
Example: AC line filter inside all electronics connects AC neutral to safety ground using same parts that also connect AC hot to safety ground. Why? Why would we use parts rated for over 200 volts on neutral to ground when that voltage should only be single digits? Because everything must be designed to operate without damage even on reversed polarity. As was true long before any of us even existed.
Polarity is another technique (another layer) for human safety. Reversed polarity must never harm any properly designed appliance. Other protection layers mean reverse polarity should not cause human injury.