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95%of the time that a can is covered in cardboard and mounted to phenolic it's can negative terminals are NOT connected to ground but instead tie to a floating negative line at a different potential than the chassis. The can is not a tie point but the negative of the caps and the wires connected to the can are a negative rail.
One other use for the wafer and separate negative from chassis: in some series string sets the chassis is not used as a ground/B- and serves only as a shield with it's only connection to the rest of the circuit being a parallel cap and resistor to couple it to signal ground, but limit chassis shock current.
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