Electrician's Licensing Practice Exam

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What should you refer to for wire sizing according to the NEC?

Table 250-130
Annex C1 and C2
Table 310-16
Table 240-4

The correct answer is: Annex C1 and C2

The correct answer relates to Annex C1 and C2 in the National Electrical Code (NEC), which specifically provide guidelines for selecting wire sizes based on various factors, including ampacity and temperature ratings. These annexes are instrumental in determining appropriate wire sizing to ensure safety and compliance with the electrical code. They consider the effects of ambient temperature, insulation type, and installation conditions on the conductor's capacity to carry current without overheating. While other tables within the NEC, such as Table 250-130, Table 310-16, and Table 240-4, offer important references for specific applications and conditions, they do not provide the comprehensive overview for wire sizing as outlined in the specified annexes. Table 310-16, for example, details the ampacity of conductors, but does not address the nuances covered in the annexes. Similarly, Table 240-4 relates to overcurrent protection and its sizing, while Table 250-130 focuses on grounding and bonding requirements. Therefore, for thorough guidance on wire sizing, referencing Annex C1 and C2 is essential in line with NEC standards.