Hello everybody, my question is on reference the lightning conductors (down conductor), I'm working in a project where exist a 100 ft telecom tower, the specificaction client require a 600 V, thw-ls insulation, but checking the NFPA 780-2008, the conductor is class II, 115 kcm Cross section area and obviusly uninsulated, I had spoke with the design engineer (telecom specialist) and he saw that is frecuently used on telecom towers install this type of conductor, but I understand that is wrong, and I want avoid install wrong materials.

Can someone tell me if exist some normative reference for down conductors on telecom towers that indicate the need of install insulated conductor?

Thanks