Which type of cable is NOT typically allowed for outside installations on buildings?

Which type of cable is NOT typically allowed for outside installations on buildings?

• A. Type TC-ER Cable
• B. Type UF Cable
• C. Type NM Cable
• D. Type SE Cable

Answer: (C)

Type NM (Non-Metallic Sheathed Cable) is not typically allowed for outside installations on buildings due to its lack of moisture and UV protection. NM cable is designed primarily for indoor use where it is protected from physical damage and adverse environmental conditions. In contrast, Type TC-ER (Tray Cable - Exposed Run), Type UF (Underground Feeder), and Type SE (Service Entrance) cables are specifically designed to handle outdoor conditions. These cables feature materials and construction methods that provide resistance to moisture, sunlight, and other outdoor elements, making them suitable for exterior installations. Understanding the correct applications for each type of cable according to the NEC is essential for ensuring safety and compliance in electrical installations.

Type NM (Non-Metallic Sheathed Cable) is not typically allowed for outside installations on buildings due to its lack of moisture and UV protection. NM cable is designed primarily for indoor use where it is protected from physical damage and adverse environmental conditions.

In contrast, Type TC-ER (Tray Cable - Exposed Run), Type UF (Underground Feeder), and Type SE (Service Entrance) cables are specifically designed to handle outdoor conditions. These cables feature materials and construction methods that provide resistance to moisture, sunlight, and other outdoor elements, making them suitable for exterior installations.

Understanding the correct applications for each type of cable according to the NEC is essential for ensuring safety and compliance in electrical installations.