All references are based on the 2017 edition of the NEC.
Big Box Problems
Bill Gatewood was kind enough to share this photo with us. According to him, there are eight 6 AWG wires bulging out of this box. Table 314.16(B) specifies that each 6 AWG conductor would need at least 5 cubic inches of volume in the box. That equates to a total of 40 cubic inches needed to properly accommodate these wires. Table 314.16(A) notes that a 411/16-in. × 21/8-in. box would be