Electric heating appliances employing resistance-type heating elements rated more than how many amps shall have the heating elements subdivided?

• A. 60
• B. 50
• C. 48
• D. 35

Answer: (C)

When resistance-type heating elements draw a lot of current, the internal wiring and connections need extra protection and control to stay safe and reliable. If the heating element’s rating exceeds 48 amps, the heating elements must be subdivided into multiple sections so each portion carries less current, allowing separate control and protection for each section and reducing heat and voltage stress on any single path. This subdivision helps prevent overheating of conductors and parts inside the appliance and makes it easier to supply and protect the different sections safely. If the element rating is 48 amps or less, subdivision isn’t required by this rule. So the threshold at which subdivision is mandated is 48 amps.