Introduction to NFPA 70E (2021), Part 2: Arc flash risk assessment and PPE tables.
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- Опубліковано 5 тра 2021
- How do we know if an arc flash incident is likely and how do we dress for it? In many applications the answer is easier than you might think. The analysis (calculation) method is more accurate than the table method, but is not always feasible. This video focuses on using the tables.
Part I of 70E series (electrically safe work condition): • Introduction to NFPA 7... - Наука та технологія
Ryan! I just wanna say thank you man! These two videos really helped me pass my CEST Exam!
You're welcome. And congratulations!
Love your humility, down to earth attitude.
The two videos (part I and part II) make a great complement and very useful information and teaching. Easy, claear, funny and key information on them. Thanks Ryan, you do a great deal for electrical world and safety.
Thanks Felix!
Ryan,
Thank you for the awesome videos on NFPA 70E. I am new to the field of safety and having finished up part 1 on the electrically safe work environment I feel that I really understand the content much better thanks to you. Your methods of explaining and describing the policies, processes, and procedures of 70e has really helped me grasp some of the trickier aspects of this specialized area of safety. Sometimes it can be tough to get the explanation in enough detail when just going over the electrical code book. Your videos help explain the concepts in a fun and informative manner. I really cannot thank you enough for this amazing content.
SUBBED AND SHARING WITH ALL MY SAFETY NERD PALS!!!!
Thanks Anthony!
Ryan this is an incredibly valuable video!! Thanks for keeping it "real" and not taking it to an engineering dissertation. Engineering is absolutely critical to our trade, but electricians need to know how to protected themselves, and the practical/effective use of the Table is the answer. Well done sir!! BTW, I accidently blew myself up in a 2400v 10kamp fault in the 90's and was wearing an Oberon 100 cal suit. It was the 1st time in the 80 yr history of our plant where a flash suit was required for a task, and my incident happened THAT DAY!! While my flash suit, VR glove leather protectors, and phasing sticks had to be discarded, I had zero injuries. I too am a believer.
Thank you for breaking this down so simply. It's very appreciated. Great to see people working safely.
Ryan, thank you for your time and thoughtfulness with your videos. They're a pleasure to watch.
Ryan. Thanks for posting your excellent content. I believe in the first video you mentioned there would be a total of three. If you do plan a third video, it would be great to know how to deal with situations where you don't have all the information necessary to use the table method. Like when you can't access the transformer or the transformer's labels are missing, etc.. I've implemented 70E in a manufacturing facility where we designed, manufactured, and tested a high power electrical product, and once you've got the study complete, labels installed, PPE purchased, employees trained, and procedures written, it's pretty straight forward. And, although the NEC requires available fault current to be posted at the service, older equipment will still be around for 40-50 or more years without this information. I'm sure companies have guidelines that help there service personnel choose adequate PPE when they lack information, I just don't know what it is. Maybe you simply call the utility and they can give you the transformer information in just a few seconds... ??? Thanks
Lawton, whoever the supplier (utility company) is should be able to give you an AFC(available fault current) at your metering point. Most utility companies have the xfmr information in a system/log to know for replacement if it ever need it.
Very informative video. Thank you for explaining things using simple language that is easy to understand. It's such a pleasure to watch.
The only video out of 4 days worth of watching that actually had any good information of what PPE to wear and how to figure this out as a normal electrician and not a double e
I hope you mean four days of other channels?
@@RyanJacksonElectrical yes definitely 4 days of other channels all on arc flash specific but I liked the dumb down version for my guys on the job
I hate to bother you but I was wondering if you have a video dealing with the strapping rule of pipe that is less than 18 in I know that code is gone away but what is the proper amount before it needs to be strapped if it is just going to between two boxes if you have a video on this I would love to see it it has been called so many different ways because now the code is so vague I would really appreciate your advice
@@tateabdon1 I don't think I do, but I will add it to my list.
@@RyanJacksonElectrical what is your opinion on it when does a pipe need to be strapped just between two boxes I really liked the 18-in rule but now there's really nothing that says anything about it
Thanks for clarification on the "handle" rule for determining if something is a molded case breaker! That's awesome. Great information as always from you Ryan. Looking forward to your next video
Great training video on NFPA 70E. Easy to understand. Please keep on making similar videos on other electrical engineering standards including IEEE, and IEC electrical standards in addition to NFPA and UL standards
Another great video ... thanks Ryan!
Another great video Ryan. Thanks
Another Great video and information, Thanks Ryan!
Have to give it up to you, your on the map, in San Antonio Texas.
Westside
You are the best. Really appreciate for sharing your knowledge.
Ryan, thanks for sharing such a great standard
Seriously, you're a top tier educator. 👍Thank you bro.
Excellent education thank you!
Great content
Thanks from India
I too have a bunch of passion about this. Commissioning things(new installs) I do my level-headed best to be sure there is minimal danger when closing that breaker for the first time...i.e resistance checks p-p and p-g. Nonetheless, I do not guarantee anything. Typically the electrician is suited up and requires someone else to be there too(customer policy). Am I going to watch the person close the breaker? Nope. I'll be in a far corner faced away even though I have confidence things will be OK. But, if things weren't OK I'd be an idiot to be to be right next to that person watching them close a breaker. Always wonder what the hell I would do if things went bad...they never have but gotta wonder what the hell I'm on 'hot' standby for and what the hell I could do anyway. The 2 man thing is company policy at many places I've done work at.
The 2nd man is there to retrieve the body, or what's left of it. As gruesome as it is, that's what my foreman told me when I was around the corner from him when he closed large breakers.
Ryan, Very well explained about the NFPA 70E, in a very practicable way (photos, experience sharing etc,.) very much appreciated for your efforts to make this video and creating awareness on the AC part. Question: Will there be any videos on the DC part? Hope it will come soon...
Nice sir!
Thank you so much.
Thanks Ryan so much tho información is good to understand
Thank you so much
51:40 How would you determine the available fault current when it's not readily available? I was told to reference to the upstream transformer and use a basic SCC calculation. Full-load current / impedance
Great videos! Anything specific to help pass the CEST exam ?
Last rant: Thanks for your patience, BTW. Never witnessed a virgin circuit cut-in failure. But, I did see a 68 y/o plumber that was on fire due to the fact he dropped a wrench into a 1300A 480V boiler unit. Not a pretty sight and I'm sorta sorry for him that he lived. I'd not have wanted to. The incident took seconds...the suffering for that poor SOB lasts for the rest of his lifetime.
Ryan, would "other 600 volt class equipment" include a 480v panel fed from a mccb but with 29ka afc? Or, since the panelboard doesn't fall in the first two panelboard listings (rated 240volts/less and 240-600 volts) I'm unable to use the PPE category method?
My guess is the other 600 volt equipment at 65ka with clearing time of 2 cycles would include the panel, but I don't want to guess.
Thank you in advance for your guidance!
Impressive content, in video one and two you give such good explanation on the NFPA 70E. Thank you for that. Could you please give a description on the system in which the incident energy was above 205 cal/cm2. I was really impressed by that value.
By the way, best regards from Colombia, Latin America.
Thanks Santiago. I'm afraid I didn't take that picture, sorry. I have seen some that are extremely high, but never that high. My guess would be that the available fault current was very high and there was no overcurrent protection upstream of it.
@@RyanJacksonElectrical Thank you for your response. Hope to see more of your content.
Mr.Jackson,
I would like to know the purpose of a 100 Cal/cm2 arc flash suit. With MFG companies now producing a 100 cal. suit does the NFPA 70E need to evaluate the standards/include 100 Cal as a level 4 or level 5? Im not saying I myself would want to jump into a 100 Cal. suit however are employers allowed to implement a hot work permit and issue a 100 cal suit? Assuming the facility has been calculated to determine AFC (available fault current) at device.
Hi Kyle. I agree, and it is my understanding that the new version of the Canadian safety standard that is similar to 70E does address it. I hope the 2024 70E goes beyond category 4.
Is it worth getting 2021? Is it much different than 2018? I like staying on top of things but not a fan of a pile of paper that says the same thing over and over. Qualified person makes me crazy. For me, I designed the thing. Am I qualified? Drives me nuts when and electrician has the audacity to 'push in' a contactor on a 'virgin' circuit with his finger. Frankly, I'd never do that even if it is a proven circuit. Am I qualified, cautious or both? Get's pretty vague. Got the garb(PPE), know the rules but may not be up to date...I.e. is the 2021 worth the buy?
Obviously it depends on your needs, but I would seriously consider NFPA LiNK. It is $10.00 per month for digital access to every NFPA standard, including 70E and the NEC. Ultimately, it depends on how you use the standard, I guess. There weren't a lot of "major" changes, in my opinion, but I always like having the most up-to-date materials. For me, I buy the book and use LiNK.