31-08-2015, 09:23 PM
What formulae was used to calculate this table? A back-calculation from the maximum power? i.e sqrt(rated power * Rvalue)
The maximum continuous working voltage for a resistor is the minimum of that quoted by the manufacturer for the class of resistor (Limiting Element Voltage or LEV) and the back calculation from maximum power above.
I'm not sure how you can have a table of maximum continuous working voltage that holds for all resistors of all types from any manufacturer when the LEV is independent any calculation - you've just used typical LEVs for a given power rating but the actual LEV is that stated by the manufacturer for that series of resistors and may or may not be the "common" value... e.g. tje Welwyn RC55 250mW series have a LEV of 350V, not 250V and when SMDs are considered, all bets are off...
The maximum continuous working voltage for a resistor is the minimum of that quoted by the manufacturer for the class of resistor (Limiting Element Voltage or LEV) and the back calculation from maximum power above.
I'm not sure how you can have a table of maximum continuous working voltage that holds for all resistors of all types from any manufacturer when the LEV is independent any calculation - you've just used typical LEVs for a given power rating but the actual LEV is that stated by the manufacturer for that series of resistors and may or may not be the "common" value... e.g. tje Welwyn RC55 250mW series have a LEV of 350V, not 250V and when SMDs are considered, all bets are off...
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