Test question

[Kwayne86]

I had a question on the LA contractor exam that stumped me. I couldn’t find it anywhere it asked that if a neutral in a service overheated what size neutral conductor could be used in parallel to address the problem given it being engineered correctly.

 

[infinity]

Take a look at 310.10(H)(1) Informational note

Welcome to the Forum.

 

[Dennis Alwon]

Yeah without knowing the load it would be hard to answer that but I am pretty sure the answer would be the smallest size allowed for making a parallel connection

 

[infinity]

Yeah without knowing the load it would be hard to answer that but I am pretty sure the answer would be the smallest size allowed for making a parallel connection

Good point, given that the question used the word overheating I would assume that they're referring to the IN.

Exception No. 2: Under engineering supervision, 2 AWG and 1 AWG grounded neutral conductors shall be permitted to be installed in parallel for existing installations.
Informational Note to Exception No. 2: Exception No. 2 can be used to alleviate overheating of neutral conductors in existing installations due to high content of triplen harmonic currents.