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Sizing anti-condensation heaters

Sizing anti-condensation heaters

Sizing anti-condensation heaters

(OP)
How do I specify the required temp differential on anti-condensation heater for an outdoor enclosure for a design ambient temp of -26 to +50 deg C.  The only design info I have found is the statement "temp differential between enclosure interior and ambient must be at least +10 degrees to prevent condensation and humidity. Double the size of heater for outdoor applications."
Given the delta T, I can calculate the wattage of the heater.  What I need is the method to determine the delta T. Obviously there is a limit as to the max temp the internal components can withstand, so if a delta of 10 degrees is the minimum what is generally accepted as sufficient? (provided components can handle the resulting temp) Is there a standard?

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