424.22 Overcurrent Protection.
(A) Branch-Circuit Devices. Electric space-heating equipment,
other than such motor-operated equipment as required
by Articles 430 and 440 to have additional overcurrent protection,
shall be permitted to be protected against overcurrent
where supplied by one of the branch circuits in Article 210.
(B) Resistance Elements. Resistance-type heating elements
in electric space-heating equipment shall be protected at not
more than 60 amperes. Equipment rated more than 48 amperes
and employing such elements shall have the heating
elements subdivided, and each subdivided load shall not exceed
48 amperes. Where a subdivided load is less than
48 amperes, the rating of the supplementary overcurrent protective
device shall comply with 424.3(B). A boiler employing
resistance-type immersion heating elements contained in an
ASME-rated and stamped vessel shall be permitted to comply
with 424.72(A).
