A normal-frequency electric furnace refers to an electric furnace operating at a frequency of 50 or 60 Hertz. There are several synonyms for this type of furnace, which include the following: 1. Standard-frequency electric furnace 2. Traditional-frequency electric furnace 3. Conventional-frequency electric furnace 4. Regular-frequency electric furnace All of these terms are used interchangeably with the term normal-frequency electric furnace and describe the same type of furnace frequently used in manufacturing and processing applications. These furnaces are designed to generate intense heat, producing temperatures ranging from 1,200 to 1,600 degrees Celsius. They are energy efficient, cost-effective, and reliable, making them a popular choice in many industries.