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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Its going to be a messy calculation, since there are many factors that come into play. How many layers, ambient temperature, etc. Derating could be as low as 75% of capacity, for 1 layer, up to 25% for say 6 or more layers. It's the combined mutual heating of the layers that cause the derating.
Maybe some company has a similar item, like a self coiling garage extension, and they have done the derating already, and you could base your estimate on theirs.
Try a google search for "derating cables on reels" or similar.
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