Thermostatically controlled switching devices and combination thermostats and manually controlled switches shall be permitted to serve as both controllers and disconnecting means, provided they meet all of the following condition(s): Select one: a. Provided with a marked “off ” position b. Directly open all ungrounded conductors when manually placed in the “off ” position c. Designed so that the circuit cannot be energized automatically after the device has been manually placed in the “off ” position d. all of the above

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Thermocouple

A thermocouple is a temperature measurement device. It includes diverse metal wires which are joined collectively to form a joint. At the same time as the junction is hot or cold, a small voltage is generated inside the measuring thermocouple electrical circuit, which corresponds to the temperature.