Which standard governs enclosure strength for electrical/electronic equipment installed as part of industrial machines?

• A. NFPA 70
• B. NFPA 101
• C. NFPA 13
• D. NFPA 79

Answer: (D)

Enclosures for electrical and electronic equipment that are installed as part of industrial machines must meet a standard that focuses specifically on machine integration and the harsh conditions found in manufacturing environments. NFPA 79, Electrical Standard for Industrial Machinery, provides the requirements for how these enclosures are constructed and how they withstand mechanical stress, vibration, dust, moisture, and other workplace factors, ensuring the equipment remains protected and accessible for safe operation. This specialization is what makes NFPA 79 the right reference for enclosure strength in machine-integrated equipment. By contrast, NFPA 70 (the National Electrical Code) covers general electrical installations, NFPA 101 addresses life safety, and NFPA 13 relates to sprinkler systems, none of which target enclosure performance in industrial machinery.