Did 2017 fix this? 517.34

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charlie b

charlie b

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During a lunch hour technical discussion amongst my group, this question came up.

  • 2011 edition, Informational Note Figure 517.30, No. 1 showed the Life Safety and Critical Branches collectively as the “Emergency System.” These two plus the Equipment Branch are shown collectively as “Essential Electrical System.”
  • Same figure in the 2014 edition removed the “Emergency System” designation, but retains the title of “Essential Electrical System” for the three branches.
  • OK so far.
  • 2011 edition, article 517.34 says that the Equipment Branch can be automatically or manually reenergized after the “Emergency System” is reenergized.
  • Since the 2014 edition removed the term “Emergency System” from this context, its article 517.34 says that the Equipment Branch can be automatically or manually reenergized after the “Essential Electrical System” is reenergized.
  • That is absurd! You can’t wait to turn something on until after that very same thing is turned on.
  • Anyone ever read Catch 22?
  • I found four errata on the 2014 edition. None of them addressed this issue.

I don’t have a copy of 2017 yet. Did this get fixed?
 
I tried to pm you and attach screen shots but there's no way to insert an image in a PM now? (only a url)
And the paper clip is gone from PM too?

To that end, here goes. If this is improper to post these screen shots, please delete them (you're a mod) and I'll know going forward.

70-17 517.30.jpg70-17 517.34.JPG70-17 517.34 part II.JPG
 
Thanks. I was able to get my hands on a copy of 2017. I see that the problem was not fixed.

I find it strange that the article of my interest has been renumbered. In 2014, the title of article 517.34 was "Equipment Branch Connection to Alternate Power Source." The same text in 2017 is in article 517.35.
 
mgookin said:
If this is improper to post these screen shots, ]
Click to expand...

No it is not improper. You defined your source or gave credit of where you got the material above, basicly your citation.

While as a whole the NEC is copy writed, limited info may be reproduced for educational type reasons.

We can post sections of the NEC, but we cannot copy and paste the whole document here even though we own copies of it.
 
jumper said:
No it is not improper. You defined your source or gave credit of where you got the material above, basicly your citation.

While as a whole the NEC is copy writed, limited info may be reproduced for educational type reasons.

We can post sections of the NEC, but we cannot copy and paste the whole document here even though we own copies of it.
Click to expand...

+1 :thumbsup:
 
GoldDigger said:
The last time I was there, the "online viewer" still required you to download a browser application to provide the security against copy/download that they wanted.
Click to expand...


It's been so long I don't remember if I had to download anything or not. I'm on a pc. I think you're on a phone? The only thing different was this time it made me type a username & password and I got both right on first guess. :thumbsup:
 
mgookin said:
It's been so long I don't remember if I had to download anything or not. I'm on a pc. I think you're on a phone? The only thing different was this time it made me type a username & password and I got both right on first guess. :thumbsup:
Click to expand...

The required app was on a laptop browser (Java applet actually IIRC). I do not spend all of my time on a phone. :)
 
charlie b said:
Thanks. I was able to get my hands on a copy of 2017. I see that the problem was not fixed.

I find it strange that the article of my interest has been renumbered. In 2014, the title of article 517.34 was "Equipment Branch Connection to Alternate Power Source." The same text in 2017 is in article 517.35.
Click to expand...

I agree the wording could be better. Basically, instead of saying "after the Essential Electrical System is reenergized" they should say "after other Essential Electrical Systems are reenergized."

But it seems pretty obvious what the intent is since there is a specific list of items that are allowed for "delayed connection".
 
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