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I have a question regarding the books answer to this problem. It states that for this case, circuits less than 100A you need to use the 60degC column for cable ampacities. Is this because they only give the terminal ratings of the OCPD and not the field devices? The code will allow the use of...

My first post here so bear with me: Your logic is correct, but to take the 20k using the P/A formula you need to bring that value back to t=0. Anytime you use the uniform series present worth, the value given will be at one time period before the uniform series begins, i.e. for this case the...