ECN Forum Forums General Topics of the Trade General Discussion Area ground resistance ?

Roger
I understood the angle your question was coming from
As we have seen, it is good to stir the pot once and awhile...Since Bennie's passing, you and Bob have picked it up

Pierre

I can't find the original thread with a quick search either, but the following document includes a section on the method I described and goes into more detail:
http://www.tradeport.on.ca/ApplicationNotes/aemc.pdf

Trekkie,

Yup, I do think some of the numbers are arbitrary.

Does the 10 foot tap rule offer that much more safety over what could easily be the 11 foot tap rule? :-)

I've also heard the tale that the 6' 7" mounting height for a disconnect handle was based on what the shortest person on the code panel could comfortably reach.

Frequently, when I see a number in the NEC, I wonder what the reasoning was that resulted in that exact number. I suspect that at least a few of them were selected because they were easy to remember.

Tom