Enclosures for various electrical equipment must be marked with an enclosure-type number, as specified in Table 110.28. The correct answer is "enclosed panelboards," ensuring compliance with NEC standards.
The correct answer is:
O b. enclosed panelboards
In electrical installations, enclosures for various equipment, including switchboards, switchgear, industrial control panels, and more, are required to be marked with an enclosure-type number. This marking is specified in the guidelines outlined in Table 110.28 of the National Electrical Code (NEC). The marking requirement is applicable to enclosures not exceeding 1,000 volts nominal and intended for specific locations.
The term "enclosed panelboards" in this context refers to the enclosures of panelboards, which are distribution boards that house electrical components such as circuit breakers or fuses. These panelboards play a crucial role in controlling and distributing electrical power within a facility. The marking ensures compliance with NEC standards and facilitates proper identification and classification of enclosures based on their intended use and characteristics.
In summary, the specific marking requirement for enclosures, as mandated by the NEC, is applicable to "enclosed panelboards," ensuring proper identification and adherence to safety standards.