Panels used for fixed outdoor electric snow-melting equipment and employing resistance type heating elements shall not exceed what wattage per square foot of heated area?

The correct answer is 120 watts per square foot for fixed outdoor electric snow-melting equipment using resistance type heating elements. This limit is established to ensure safety and efficiency in snow-melting applications.

By adhering to this wattage standard, the system can effectively melt snow and ice without excessive energy consumption, which could lead to overheating or damage to the heating elements or surrounding surfaces. Additionally, this wattage threshold helps balance performance with energy efficiency, ensuring that the systems do not become overly costly to operate while still providing reliable snow management.

The choice of 120 watts per square foot is in line with industry standards and regulations, which prioritize not only effectiveness but also safety for both installations and users. Systems exceeding this wattage could present hazards, including potential fires or equipment failure.