EM's are responsible for the operation of a ship's electrical power generation systems, lighting systems, electrical equipment and electrical appliances. The duties include installation, operation, adjustment, routine maintenance, inspection, test and repair of electrical equipment. EM's also perform maintenance and repair of related electronic equipment.

Enginemen (EN) operate, maintain, and repair (organizational and intermediate level) internalcombustion engines, main propulsion machinery, refrigeration, air conditioning, gas turbine engines, and assigned auxiliary equipment on Navy ships; stand safety watches on auxiliary boilers and other assigned equipment.