Proposed NESC Table 410 Provisions

[WodyM]

I heard that NESC is considering revising either Table 410-1 or 410-2 or both in the near future. Has anyone else heard this and do you have any more information?
Thanks

[Catcher13]

Wow! That's quite a pretty nasty rumor.:eek: If it is true it will certainly confuse the utility side of things even more. Where did you hear this?

[acobb]

First I have heard! It is my understanding that the NESC had gone to a 5 year revision cycle (hence 2012), so if this is true then someone involved in the process needs to let us know that early revisions are forthcoming! Could make a huge difference in the advice that we give to our clients today!!!!!

Alan

[Catcher13]

That's going to be huge. There is so much confusion as it is between the NESC tables, IEEE methods, the physics models of ArcPro and Duke programs, 3 phase vs. 1 phase on overhead lines etc. As soon as anyone knows any info, please let us all know.

[apowerengr]

I just saw the draft changes yesterday which involve only the recommendations under 1000 volts. Not sure if something will be released as a TIA before the next code cycle or not. I have to admit I don't find the NESC confusing at all - is there something in particular you have questions about?

[acobb]

I do not find the NESC confusing at all. If fact it is so simple that I have wondered if the arc flash portion was nothing more than an after thought.

Alan

[stevenal]

Too different subjects seem to be getting confused here. The TIA (http://grouper.ieee.org/groups/nesc/TIA_5Sept2008.pdf) has been released, dealing with the miscalculations originally done on table 2. Not sure why this was a TIA, and not errata.

I've attached a proposed 2012 table 1, dealing with secondary voltages. Presumably the '07 tables will be renumbered for 2012.

[acobb]

Stevenal,

Be sure to check you private messages

[Electric John]

Hi guys,

is everyone aware of this modification. I just learn about this modification!

TIA September 8, 2008

http://grouper.ieee.org/groups/nesc/TIA_5Sept2008.pdf

Is there any other modifications that you are aware of?

Thanks