This was a question on another forum I thought might stir some great answers. The question did not say but I assume that it is and underground service.
On a project with a 4000 amp service, the engineer
says that we must install 15 parallel 500 kcmil copper conductors to meet the code. The local utility company requires that we install 11 parallel 500 kcmil conductors. The engineer is using table B310.7(Annex B) as backup for his position. However 310.15A1 states " Ampacities for conductors shall be permitted to be determined by tables or under engineering supervision, as provided in 310.15B and C. We believe, as does the local utility company, that Table 310.16 would apply if we opt for the table method of sizing the conductors. What is your opinion?
On a project with a 4000 amp service, the engineer
says that we must install 15 parallel 500 kcmil copper conductors to meet the code. The local utility company requires that we install 11 parallel 500 kcmil conductors. The engineer is using table B310.7(Annex B) as backup for his position. However 310.15A1 states " Ampacities for conductors shall be permitted to be determined by tables or under engineering supervision, as provided in 310.15B and C. We believe, as does the local utility company, that Table 310.16 would apply if we opt for the table method of sizing the conductors. What is your opinion?