Each oil immersion heater must have the following:
(a)An operating thermostat.
(b)Heating elements that have no electrical contact with the oil.
(c)A high temperature limiting device that:
(1)Opens all conductors to the heater;
(2)Is manually reset; and
(3)Actuates at a temperature below the flashpoint of the oil.
(d)Either—
(1)A low-fluid-level device that opens all conductors to the heater if the operating level drops below the manufacturer's recommended minimum safe level; or
(2)A flow device that opens all conductors to the heater if there is inadequate flow. [CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28283, June 4, 1996]
(a)An operating thermostat.
(b)Heating elements that have no electrical contact with the oil.
(c)A high temperature limiting device that:
(1)Opens all conductors to the heater;
(2)Is manually reset; and
(3)Actuates at a temperature below the flashpoint of the oil.
(d)Either—
(1)A low-fluid-level device that opens all conductors to the heater if the operating level drops below the manufacturer's recommended minimum safe level; or
(2)A flow device that opens all conductors to the heater if there is inadequate flow. [CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28283, June 4, 1996]