It looks more like some really old fabric-covered NM (6-3 maybe?) with the covering removed.
I hadn't thought of that permutation.
Exactly how would cable insulation like that stand up to air-borne moisture, considering that this unit is outdoors.
Oh and one other thing, Joe posted an image of the IEC "Test Finger" up in the General Discussion Area.
I'd be interested to see the box and switch pass the test with the Finger.
No cheating now.