Another image added to the free Gallery: Most Common Conductor Sizes in Residential Branch Circuits

General Inspection Topics Special Deals for InterNACHI Inspectors
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Interesting that you ignore one of the most often incorrect systems located in homes, especially older homes… Window and Through-wall Air Conditioners!!

What Is The Amperage Of A Window Ac?.

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JJ, what’s your take on how these AC are incorrect?

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Most commonly, incorrect duplex receptacles (not dedicated, such as with Microwaves, EV Chargers, etc.), with assumed undersized conductors, as observed by scorched outlets/cover plates/plugs.
Only so many can be attributed to old, out-dated units.
Note: I rarely see this issue in Commercial properties with PTAC units. When I do, it’s usually in 50’s-60’s era structures.

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Why were aluminum conductor sizes left off for 15 and 20 amp circuits?

Lighting circuits typically would not be on 20 amp circuits.

Water heaters do not need 10-3.