Coiled power conductor maximum length
The maximum current/temperature limits for cables are specified with the cables straight in conduit. As you add more cables, the rating drops. Coiling will do exactly the same thing, though coiling is not usually specified under 'derating' as it's generally a bad thing to do.

If you can derive a new, lower, power rating for the cable when that length is coiled, then you could protect the cable with a smaller value breaker (it's not the normal consumption of the load that's important, it's the protection for the cable). I'm not sure how you could realistically estimate what the lower rating should be, to the satisfaction of anybody who is going to insure or underwrite the installation against fire risks.