UL 1082:
SA11.3.4 If a grounding-type attachment plug is provided or the enclosure of the drip-type coffee maker
has metal parts that are likely to become grounded, such as a metal bottom with bumped-out metal feet,
the limiting-type device shall be located in the ungrounded supply conductor (if it can be identified) and
the temperature-regulating control shall be in the other conductor. If the ungrounded supply conductor
cannot be identified, the limiting-type device shall be located in one supply conductor and the
temperature-regulating control shall be located in the other supply conductor.