Is it permissible to course a conductor through the air for 5' by doubling the fasteners on each end?

A conductor should not be routed through the air over any distance without proper support and securing. The practice of doubling the fasteners on each end does not generally meet the standards for conductor support when it comes to safety protocols and installation guidelines. Conductors need to maintain a specific physical integrity and support throughout their length to mitigate risks, such as swaying or movement due to wind or other environmental factors.

The National Electrical Code (NEC) and standards set by organizations like the Lightning Protection Institute outline the proper methods for securing conductors, which involve more than just fastening at the ends. Support structures, like poles or struts, should be used to hold the conductor securely along its length to ensure it does not become loose or pose hazards. Consequently, simply doubling fasteners does not comply with best practices for conductor installation and safety.