Dan

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A lousy answer such as mine is simply a way to move the next good question toward the front.
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Far from being a "lousy Answer" you have increased my knowledge and probably helped in some way make me understand the principles to make me a better engineer.

As I mentioned before, Im not looking for information in manuals where I choose willy nilly, or to ask the spares companies to work things out for me. I like to know myself that what I design or select is correct and ratified by me.

As an aside, the spares wholesalers always "oversize" components. This way they make more money and cover their backsides with the same token, lest they be accused of the system not operating correctly in extreme conditions.

The learning aspect of this forum is indeed an important one, and if members who know the ropes, or have expertise in certain , specific areas are willing to impart this, then surely the health of all us fridgetechs can only improve!

Thanks for your answer Dan.