Article 399 Wiring Method Ampacity Requirements

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xptpcrewx

Power System Engineer
Location
Las Vegas, Nevada, USA
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Licensed Electrical Engineer, Licensed Electrical Contractor, Certified Master Electrician
Wondering if there are any ampacity requirements in the NEC for Outdoor Overhead Conductors Over 1000-V (Article 399)? Thanks in advance.
 

don_resqcapt19

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Illinois
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retired electrician
I believe the tables in 310.60 of the 2017 NEC apply to those installations. If you are using the 2020, the over 1000v ampacities are in Article 311.
 

xptpcrewx

Power System Engineer
Location
Las Vegas, Nevada, USA
Occupation
Licensed Electrical Engineer, Licensed Electrical Contractor, Certified Master Electrician
I believe the tables in 310.60 of the 2017 NEC apply to those installations. If you are using the 2020, the over 1000v ampacities are in Article 311.

The tables in 310.60 (or Article 311) are only for type MV cable. What about exposed/bare overhead conductors...
 

don_resqcapt19

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Location
Illinois
Occupation
retired electrician
The tables in 310.60 (or Article 311) are only for type MV cable. What about exposed/bare overhead conductors...
Then I guess the NEC does not have the required information. It does a very poor job with medium voltage installations.
Many look to the NESC for medium voltage installations.
 

xptpcrewx

Power System Engineer
Location
Las Vegas, Nevada, USA
Occupation
Licensed Electrical Engineer, Licensed Electrical Contractor, Certified Master Electrician
Then I guess the NEC does not have the required information. It does a very poor job with medium voltage installations.
Many look to the NESC for medium voltage installations.

Thanks don-resqcapt19, this was my initial feeling, but wanted to make sure I wasn't missing anything. If anyone else can chime-in on how to handle this, it would be greatly appreciated.
 
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