Graffeo Practice Exam #61

[BebeshKing PE]

Could anyone explain to me or refer me to any reference material in regards to this problem? not sure if this is a lightning protection or NESC topic.

Thank you

 

[LyceeFruit PE]

This would fall under "not going to show up on the exam"

It is definitely not NESC and I wouldn't really call it lightning either.

 

[DLD PE]

This would fall under "not going to show up on the exam"

It is definitely not NESC and I wouldn't really call it lightning either.

This:  

I asked about this one last summer and it's in my folder along with others like this called "weird problems".  I had it in the back of my folder in case something weird like this showed up.  I wouldn't invest too much time with it.

 

[speakeelsy PE]

This is a step potential/voltage gradient problem. Ive seen it covered in electrical safety classes. The wikipedia article on earth potential rise says it's covered in IEEE-80, but just google step potential and you'll get some good expainations.

 

[BebeshKing PE]

This is a step potential/voltage gradient problem. Ive seen it covered in electrical safety classes. The wikipedia article on earth potential rise says it's covered in IEEE-80, but just google step potential and you'll get some good expainations.

So it looks like it would fall to the Grounding section. Thanks for the info. 

 

[speakeelsy PE]

So the safety department actually showed this video in class today and it had step and touch potential in it. No math, and it's really cheesy, but still might help you understand the concept behind the problem.

https://youtu.be/fLVzvMTgGDY