Based on the 2023 NEC.
Question: What volume allowance is required to be made for a terminal block installed within a box?
See answer below.
Answer: A single volume allowance in accordance with Table 314.16(B)(1) based on the largest conductor terminated shall be made for each terminal block assembly.
Explanation: Each terminal block assembly requires a single volume allowance regardless of how many terminals there are or how many conductors are terminated.
Lupacchino is a senior design engineer with Gaylor Electric, Inc. in Noblesville, Ind. and serves as an alternate on NEC Code-Making Panel No. 3. He is currently licensed in more than 80 jurisdictions. He can be reached at [email protected]