CEC suggests specific arrangements for underground cable installations in section B4. I am working on a design which specifies 6C/phase cables in 6 conduits.
Our preferred arrangement to accommodate installation flexibility is to have all phase-A, B and C cables installed in one duct bank; however this does not comply with section B4- requirements which mandate A-B-C cables to be installed in each conduit. Conduit run is less than 100'.
I am planning to run cable ampacity study and prove that certain percentage of imbalance will not cause any overheat and then apply for exemption. I appreciate any other feedback on this issue.
Our preferred arrangement to accommodate installation flexibility is to have all phase-A, B and C cables installed in one duct bank; however this does not comply with section B4- requirements which mandate A-B-C cables to be installed in each conduit. Conduit run is less than 100'.
I am planning to run cable ampacity study and prove that certain percentage of imbalance will not cause any overheat and then apply for exemption. I appreciate any other feedback on this issue.