If a grounded surface metal box makes direct contact with the mounting strap for a switch or receptacle, then the A. bonding jumper can be undersized. B. neutral conductor will operate as the equipment grounding conductor. C. bonding jumper isn't required. D. device must be protected with a GFCI device.

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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.