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The interlock on the back of the set it's self is polarized. The plug on the cord should be to if original or correct replacement.
The main advantage of a polarized cord is that the building neutral ( which is grounded) can be always wired to chassis (assuming the electrician that wired your building wired the outlet polarity correctly) making the set safer.
Since the 50's the UL required hot chassis sets to not have any exposed metal cabinet hardware with connection to the chassis so the polarized cord is redundant.
The set does not care about polarity given to it.
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