What types of systems are addressed in Chapter 5 of the NEC?

Chapter 5 of the National Electrical Code (NEC) focuses specifically on special occupancies, which include a range of unique environments and conditions that require specialized attention due to safety concerns. These special occupancies encompass hazardous locations, healthcare facilities, and similar environments where standard electrical installation practices may not provide adequate safety or performance due to the nature of the materials or conditions present.

In hazardous locations, for example, there are increased risks associated with flammable gases, vapors, or dust, which can lead to explosions or fire. Therefore, the NEC provides specific requirements in Chapter 5 to mitigate these risks effectively. This chapter goes beyond typical residential or commercial installations by addressing the unique challenges these environments present, ensuring that electrical systems operate safely under potentially hazardous conditions.

The other options, while relevant to electrical installations, are not the focus of Chapter 5. It does not primarily deal with residential electrical systems, general commercial installations, or outdoor electrical supply systems, as these topics are covered in other sections of the NEC that align with more conventional wiring practices and standards.