Electrician's Licensing Practice Exam

What does Table 370.6A in NEC 2008 address?

1. The types of circuits allowed

2. The sizing of conductors

3. The number of wires per trade size in a box

4. The voltage ratings for wiring

The correct answer is: The number of wires per trade size in a box

Table 370.6A in the NEC (National Electrical Code) specifically addresses the number of conductors or wires that can be accommodated within a given size of electrical box. Knowing this table is essential for electricians because it directly impacts safety and functionality. Overcrowding a box can lead to overheating, potential fire hazards, and improper function of electrical devices. This table provides crucial guidelines for maintaining safe practices when installing wiring systems. The other options, while related to various aspects of electrical installations, do not pertain specifically to what is outlined in Table 370.6A. For example, the types of circuits allowed involve different regulations and considerations. The sizing of conductors is addressed elsewhere in the code, often focused on capacity and load bearing. Finally, voltage ratings for wiring are specified in separate sections that focus on insulation and types of materials used, rather than box capacity.