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| Arc Flash Rating for Hard Hats ??? https://brainfiller.com/arcflashforum/viewtopic.php?f=5&t=5679 |
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| Author: | Kimo [ Mon Mar 27, 2023 11:32 am ] |
| Post subject: | Arc Flash Rating for Hard Hats ??? |
I am hearing rumor that our company will be requiring all electrical personal to wear a Full Brimmed Hard Hat. I have not seen any official Policy or been told this Formally, so just trying to do some homework and get out in front of this. I have never seen a marking on a Hard Hat showing how many cal/cm2 it was rated for nor can I find anything ins ANSI Z89.1 stating anything for this. Just the Electrical Insulation Classes "C" - Conductive and no electrical insulation, "G" - General and up to 2,200 Volts and "E" - Electrical and up to 20,000 Volts. Is anyone aware of any other testing or standard for providing an Arc Flash Rating for Hard Hats? Furthermore, I have never seen an Arc Flash Suit and/or Head Protection that utilizes a Full Brimmed Hard Hat. Anyone ever seen this? Maybe, someone in the Forum that works for a manufacture and/or a testing facility could help clarify how they get the arc flash ratings for their head protection and why hard hats are not labeled with hazard they are tested for? Thanks! James |
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| Author: | elihuiv [ Mon Apr 10, 2023 10:31 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
I did a published (IEEE Paper) paper with this data on that material. While in some exposures the hard had suspension can melt, the materials take a LOT to ignite or melt. Melting in a regular brim didn’t occur on the MSA V-Guard until over 40 cal/cm². There is NO standard, I proposed one but was shot down by ANSI and the ASTM committees. Easy to do and there have been many tests. I’ve seen one or two hard hat melts. One or two burns but the worst was caused by a non-AR hairnet ignition. ArcWear and r-Hazard have this data as I am retired. Hugh Hoagland |
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| Author: | Kimo [ Mon Apr 10, 2023 11:18 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
Thanks Hugh! |
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| Author: | stevenal [ Mon Apr 10, 2023 4:21 pm ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
I've always thought the brow pad would be the most problematic part. I believe mine is polyester. When wet with sweat, the moisture might flash into steam; and when dry likely to melt. Right there in front unless covered with a face shield. |
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| Author: | elihuiv [ Tue Apr 11, 2023 4:48 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
I’ve been arc testing for 28 years and not see it with the open arc we is except when something ignores from under it. In ove 230 investigations, I’ve seen it twice but VERY high energies for not wearing a shield. Strangely it’s VERY rare. Probably due to the fact that 60-80% of the arc energy is IR so it doesn’t go around a curve. The videos I capture show just the convection currents which transmit much less energy. Hope that Helps, Hugh Hoagland |
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| Author: | wdmcgugan [ Mon May 01, 2023 7:08 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
elihuiv wrote: Probably due to the fact that 60-80% of the arc energy is IR Not to derail the conversation, and not doubting the statement, but for my own curiosity: are there any IEEE papers or the like that discuss this? I don't recall having seen anything that quantifies arc flash energy in this way. |
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| Author: | elihuiv [ Mon May 01, 2023 10:19 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
Not a derail. Good question. See E TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 50, NO. 4, JULY/AUGUST 2014 Clothing in Arc Flash: Four Types of Arc Exposure and the Effect of Moisture on Garment Appearance After an Arc Event Elihu Hoagland, Senior Member, IEEE, Mikhail Golovkov, Member, IEEE, Claude Maurice, and Phillip Clark, Member, IEEE |
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| Author: | wdmcgugan [ Mon May 01, 2023 10:53 am ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
Thanks very much! |
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| Author: | GTCole [ Mon Jun 19, 2023 4:25 pm ] |
| Post subject: | Re: Arc Flash Rating for Hard Hats ??? |
I thought you were "retired" Hugh??? But then we all know, you care too much about electrical safety to completely retire. So its awesome to hear you're "semi-retired" and still providing all of us with applicable learnings from your vast experience and knowledge. Great hearing from you again. Take care |
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