Running a 36amp load on a 40amp breaker

[DonL]

The sixth power of 92 39 {\displaystyle {\sqrt[{39}]{92}}}

is very close to 2,[5] which leads to the following rules of thumb:

If you are going to get all high tech make sure you put wire length into the formula.

 

[Speedy Petey]

In AWG wire sizes, a difference 3 AGW numbers corresponds to very close to twice/half of the cross sectional area of the wire. https://en.wikipedia.org/wiki/American_wire_gauge#Rules_of_thumb has the details.

Sorry, I don't go by rules of thumb or "very close". I go by the code book.

In the future, it would serve everyone better if you did not refer to a rule of thumb simply as a "rule".

 

[Sponsor]

 

[Homeownerinburb]

Sorry, I don't go by rules of thumb or "very close". I go by the code book.

In the future, it would serve everyone better if you did not refer to a rule of thumb simply as a "rule".

Thanks for the lecture.

At least it exists.

 

[DonL]

Thanks for the lecture.

At least it exists.

Another rule of thumb is to do it right the first time.

 

[Jadnashua]

Most of the time, there is very sound logic on how the code rules are developed. They account for worst-case scenarios. You don't have to agree with them, and most people do not have the background to know all of the ramifications of deviating from them, but you do have a responsibility to follow the instructions of the manufacturer of the product involved, and to satisfy the codes for overall safety and reliability. Any other discussion is really silly in this venue...it might be appropriate at the meetings where code changes are discussed, but not to the end user, where they just confuse the picture. It really is pretty black and white...you either do it to code, or you don't. If you don't, it may or may not fail in your particular situation, but if inspected, it should.