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The resistors he ordered are fine.
Breach of the outer layer to what? The 750 for the Vishay is across the resistor and subject to the same power limits.
Generally speaking for all resistors. 1W can handle 350 volts, 2W, 500 volts, 3W, 750 volts across the resistor. Constrained by power disippation and ambient temperature etc.
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