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Jim Phillips (brainfiller)
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Post subject: Arc Flash Warning Labels on Transformers  Posted: Sun May 01, 2011 2:02 pm |
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
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Do you post arc flash warning labels on transformers that can be tested or serviced while energized?
- Yes we label all transformers
- No we do not label transformers
- We label some transformers
Comments are welcome!
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Jim Phillips, P.E.
Brainfiller.com
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C. Harman
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Post subject: Posted: Tue May 03, 2011 10:36 am |
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Joined: Tue Mar 02, 2010 1:50 pm
Posts: 26
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No, we do not label transformers - yet.
In our standard we say if it's not labeled, and greater than 240V, don't open it unless it's an emergency, then use the tables.
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gastoor
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Post subject: Posted: Fri May 06, 2011 5:37 am |
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Joined: Sun Dec 12, 2010 5:00 pm
Posts: 27
Location: Idaho
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Electrical LeadEmergencies cause death. Don't open unless you have the proper PPE or your utility has disconnected the primary and grounded the mains. Arc Flash is a real hazard, especially at a transformer (VERY HIGH INCIDENT ENERGY). Label them and follow the boundaries for you and all of your employees' safety. 
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QuadTech
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Post subject: Posted: Mon May 09, 2011 11:26 am |
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Joined: Tue Apr 19, 2011 11:45 am
Posts: 8
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Even if it is a transformer that can be tested or serviced while energized, it couldn't hurt to put an arc flash warning label on it. You want to minimize the potential for a dangerous situation as much as possible. Especially in an emergency, there might not be enough time for someone to stop and think before they act. They need as much information readily available as possible.
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Jon K
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Post subject: Posted: Fri Feb 22, 2013 8:57 am |
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Joined: Thu Feb 21, 2013 10:56 am
Posts: 4
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For argument's sake, if I were to do an arc flash calculation for an 13.8kV/600V/347V Transformer.
Would it be OK to assume:
XFMR Primary 13.8kV: 152mm Bus Gap, x-factor of 0.973, working distance of 910mm (treating as 15kV SWGR)??
XFMR Secondary 600V: 32mm Bus Gap; x-factor of 1.473, working distance of 610mm (treating as LV SWGR)??
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wbd
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Post subject: Posted: Fri Feb 22, 2013 9:05 am |
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Joined: Wed May 07, 2008 5:00 pm
Posts: 881
Location: Rutland, VT
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Jon K - I think you will get better response if you post your question in the correct forum section. I think it should be posted in the System Modeling section. This section is for the weekly poll questions and responses to that question.
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Barry Donovan, P.E.
www.workplacesafetysolutions.com
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mayanees
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Post subject: Posted: Tue Apr 23, 2013 5:33 pm |
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Joined: Tue Feb 17, 2009 8:38 am
Posts: 62
Location: Westminster, MD
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Since the transformer buses are modeled in the software, we post the worst-case label on the transformer.
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John 28
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Post subject: Posted: Fri Apr 26, 2013 2:23 pm |
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Joined: Fri Apr 26, 2013 2:17 pm
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Jim Phillips (brainfiller) wrote: Do you post arc flash warning labels on transformers that can be tested or serviced while energized? - Yes we label all transformers
- No we do not label transformers
- We label some transformers
Comments are welcome!
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John 28
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Post subject: Posted: Fri Apr 26, 2013 2:27 pm |
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Joined: Fri Apr 26, 2013 2:17 pm
Posts: 3
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If The transformer is not a typical pole-top distruibution panel, it shoukd be labeled as it is "energerized until proven deenergized". Any pad-mount transformer caould have energized leads and the worker may be intending to change taps witha hot-stick. In this case he would need to know the Arc Flash protection boundary, so he can use the proper length pole.
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