Posted by John T on April 15, 2012 at 14:07:40 from (216.249.82.117):
There exists confusion now n then when gents ask electrical questions and myself and others refer to the National Electrical Code or NFPA 70 (which has no legal authority in itself) in our feeble attempts to help. Usually unless I forget (yep that has happened lol) I TELL THEM TO CONSULT WITH THEIR LOCAL GOVERNING AUTHORITY (if any such exists) because its them NOT ME OR ANYONE HERE OR THE NEC that can issue any final (if needed) ruling or inspection or sign off on their project.
Nowwwwwwww heres the deal:
1) The NEC ONLY suggests certain MINIMUM STANDARDS and thats NOT to say an institution or a municipality or some "local authority" or even myself may design/require things to be different, maybe above and beyond what the NEC calls for.
2) A "local authority" may or may not have adopted the absolute latest version of the NEC or any version whatsoever or see the above.
NOTE When I was a distribution design engineer my old boss was a stickler for safety and doing things above and beyond even what the NEC called for, so sometimes I may advise a certain way of doing things slightly different (maybe even better), but thats just how I was taught (NEC was the MINUMUM) and how I practiced mind you HOWEVER its been years and Im rusty as an old nail on the NEC and even if I wasnt REMEMBER TO CONSULT WITH YOUR LOCAL AUTHORITY and its them NOT any of us here who has the final say so.
EXAMPLE there are obviously situations in the NEC where say a "grounding electrode" is required at the buildings electrical service entrance. Now, in addition to conductive buried utility pipes and/or foundation structural steel or "made grounding electrodes" such as copper rods driven into mother earth etc., at our facilty we drove a rod, tested it and if it didnt pass we drove another rod, but then we were NOT required to drive a third regardless BUT I DIDNT RECALL THAT WAS ANY PRECISE NEC REQUIREMENT its just how we did it. Likewise the NEC may allow a certain voltage drop when calculating wire size and distances BUT ANYTIME ITS EVEN CLOSE I BUMP THE WIRE SIZE UP ONE GAUGE!!
Sooooooo when I answer a question my old habits tend to OVER ENGINEER a bit so you will just have to bear with me BUTTTTTTTTT if what the NEC or ultimately the "local authority" says is different GO WITH THEM AND NOTTTTTTTT ME, its been too long...
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