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 Post subject: DANGER-HIGH VOLTAGE-KEEP OUT signs
PostPosted: Mon Sep 01, 2008 7:14 am 

Joined: Wed Nov 21, 2007 3:44 pm
Posts: 10
Location: USA
[color="Red"]DANGER-HIGH VOLTAGE-KEEP OUT [/color]signs are required in accordance with NEC Sections 110.34, 314.72(F), 490.53, 490.55, 620.3(A), and 665.23.

Question: Will those who are using the new 2009 NFPA 70E, edition still post them?

I believe that they are still required to be posted and would be in addition to any other warnings described in 70E.


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PostPosted: Tue Sep 02, 2008 6:52 am 
Sparks Level

Joined: Thu Jul 19, 2007 7:54 am
Posts: 201
Location: St. Louis, MO
The two codes are not exclusionary, so that using the 70E does not exempt someone from using the NEC, and vice-versa.

My concern though, is that all of these signs and postings become so much background noise that they become ignored.
They end up getting posted anyway to try to cover liability issues, similar to the "Caution, coffee is Hot" signs now at McDonald's, but are ignored by the majority of the people.

We're already running into this at my facility. We have signs posted by the Safety department that say "Danger - High Voltage - Authorized personnel only" Then there's a label with nameplate and source information. There is also manufacturer's information (size and ratings) Now there is also a label with arc flash information.
All for a 480V / 30A pump disconnect!


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PostPosted: Mon Sep 08, 2008 1:10 pm 

Joined: Fri Sep 05, 2008 8:10 am
Posts: 36
I have been debating with our safety department in the case of deadfront equipment behind locked doors. Per NEC 2005 110.34(C) only live, exposed equipment over 600V need the sign on the door.

The way it is reiterated in 70E 400.21(C)(2) it makes it seem as if all equipment, even deadfront, behind locked doors needs the sign. The NEC requirement was not included in NFPA 70E the exact same.

I had thoght they were going to remove the NEC portion from 70E and just place a reference to NFPA 70?


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PostPosted: Sat Oct 24, 2009 7:46 am 

Joined: Wed Oct 21, 2009 5:10 am
Posts: 23
WDeanN wrote:
The two codes are not exclusionary, so that using the 70E does not exempt someone from using the NEC, and vice-versa.

My concern though, is that all of these signs and postings become so much background noise that they become ignored.
They end up getting posted anyway to try to cover liability issues, similar to the "Caution, coffee is Hot" signs now at McDonald's, but are ignored by the majority of the people.

We're already running into this at my facility. We have signs posted by the Safety department that say "Danger - High Voltage - Authorized personnel only" Then there's a label with nameplate and source information. There is also manufacturer's information (size and ratings) Now there is also a label with arc flash information.
All for a 480V / 30A pump disconnect!


The definition of "High Voltage" certainly can be debated with the context, but it seems to me that posting such a sign at a disconnect enclosing circuits not exceeding 600 volts only adds to the sign clutter you and I both dislike.

If you save those warnings for only equipment operating at over 600 volts workers will believe them more readily.


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PostPosted: Sat Feb 27, 2010 9:00 pm 
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Joined: Fri May 01, 2009 9:10 am
Posts: 73
ANSI Z-535 Standards

When you study the ANSI signal words, DANGER is not an appropriate signal word either. Just more confusion. It's amusing/frustrating to see these placards pasted on 120V control panels too. :(


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PostPosted: Mon Mar 29, 2010 5:15 am 
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Joined: Mon Mar 29, 2010 5:02 am
Posts: 136
viper57 wrote:
When you study the ANSI signal words, DANGER is not an appropriate signal word either. Just more confusion. It's amusing/frustrating to see these placards pasted on 120V control panels too. :(


No doubt... I guess most people still like some aspect of common sense... Not many people would open an electrical panel, transformer, switchgear without thinking that there may be electricity present and that it probably isn't the place to set a coffee cup..


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