Electrician's Licensing Practice Exam

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Prepare for the Electrician's Licensing Test with comprehensive multiple choice questions and hints. Improve your knowledge, skills, and confidence to excel in your exam!

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Which NEC tables cover the fill of metal boxes?

Tables 314.4 A and B
Tables 314.6 A and B
Tables 310.16
Tables 250.66

The correct answer is: Tables 314.6 A and B

The correct answer is based on the National Electrical Code (NEC) and its specific tables relating to box fill calculations for metal boxes. Tables 314.6 A and B provide the necessary information for determining the appropriate number of conductors that can be safely accommodated in various types and sizes of metal boxes. These tables take into account the dimensions of the boxes, the number of conductors, and the type of conductors used, thereby ensuring that the installation maintains safety standards and prevents potential overheating or fire hazards due to overcrowding within electrical boxes. In contrast, other tables listed do not pertain to box fill. Tables 314.4 A and B specifically address the fill of nonmetallic boxes, while Tables 310.16 focus on conductors' ampacity based on temperature and installation conditions, and Table 250.66 deals with grounding conductors and their sizes. Each of these serves distinct purposes within the NEC and does not provide guidance on box fill calculations specifically for metal boxes.