ماشالله شكرا لك

Thank you

Can you show your work for the infinite bus calculation. I can not get the 31374 amps.

Nice

i just got hired to be a technician at a old hydroelectric powerhouse built in the 20s and we have a bunch of these old GE relays. thank you for the explanation. i’ll be checking for more videos on these old components.

Jim, I deeply admire and enjoy your lectures and think you are a stable resource that does not bend to the wind of trends. I recommend you as the "Arc Flash Expert" in all my ESWP classes. You are a lighthouse in the storm of misinformation out there.

You answered that question!

Nice informational note and clarification, but you could easily argue that items 3 and 4 overlap, because if you have a breaker with an interrupting rating of 10kA, and you install it in an application were the available fault current is 20kA, then the equipment is not being used in accordance with the installations for the listing and labeling

nice presentation

thanks , is great

Thanks Jim this is great! Appreciate all you do Robert from Omaha

Excellent presentation and very important info, since the available fault current and incident energy can behave like a double edge sword in that attempts to reduce the available fault current by using impedance grounding or similar measures can increase the clearing time of the OCPD to a point of actually increasing the incident energy.

Thank you

2:22 😂😂😂 👌 nailed it! Enjoyed the lecture

Where can find the Part 2?

Jim is saying this - if an unauthorized person trespasses or crosses the Arc Flash Boundary line - PUSH THEM BACK! PHYSICALLY PUSH THEM BACK IF NEED TO. This is the only way to keep that bad actor from being blasted away or burned away seriously or fatally from an arc flash. Electricity, especially high-voltage current, is not a joke. This is very serious business, and must be respected very profoundly. And in arc flash situations, extremely serious. You mess up or screw up even very slightly in arc flash situations - you get blasted or burned up to death in just seconds!!!

I was lucky to survive a 130V arc flash from a very bad outlet in my home in 1991. Trying to plug a night light. There was a bright flash and a bit of a pop but the circuit breaker tripped in 1/32 of a second - otherwise I would have been electrocuted. I was uninjured despite something like 2 cal/cm3 of short circuit fault. But if this were a 60,000 volt arc flash if I plugged in that same night light, since I was without PPE, I would have 4th degree burns in the face and the neck - maybe 5th degree burns, because of the 35,000F superheated plasma air - and also thrown back from the "blast" at speeds as high as 200 mph - and I would have died instantly from my injuries.

I work for a 3rd party testing company. I did infrared scans today and the electrician opening up the equipment for me dropped the cover onto the lugs inside the transformer and it tripped the panel feeding it. It also tripped the main breaker in the main electrical room. Why did a feeder panel trip the main?

130.12? Is there any way to change this word salad? I understand the intent, but it looks like a team of HR/Safety, Lawyers and ISO freaks wrote this. It could simply say, "Before any work is done to electrical equipment/conductors, care must be taken to insure all possible electrical sources have been put into an electrically safe condition." It is suppose to address the possibility of multiple sources or back feeding on a circuit that is being worked on. Every qualified worker would be well aware of this hazard and will take precautionary steps.

Is there any chance that there will be higher categories of PPE added since we have more capable PPE? I honestly expected this update for 2024.

Hi Jim, Very good information video. While I fully agree that the new verbiage to test for absence of "at each point of work" is a long overdue clarification that will help reduce confusion, minimize accidents and is a step in the right direction, there still needs to be additional instructions to re-perform absence of voltage testing when working in large electrical equipment such as switchgears or MCCs. The panelboard you showed is a fairly simple electrical design with only one or more sources entering the line side of the main breaker. As long as all the sources are correctly LOTO, then testing the line side of the main breaker will be adequate for everything downstream "at each point of work". However, with very large distribution equipment such as switchgears or MCCs, there can be multiple different feeders entering different cubicles and parts of the same equipment. In some industries, not all the feeders can be isolated and must remain energized for critical loads. In such cases, the absence of voltage test, needs to be reperformed as the worker moves from cubicle to cubicle and part to part. There has been numerous accidents and operational experience where workers entered a cubicle that was thought to be de-energized (ESWC) but contained energized parts, resulting in fatalities and serious injuries, because they assumed their initial absence of voltage test was adequate. If the workers had reperformed the absence of voltage test "test before touch" then the hazardous condition identified and the accident averted. Thanks and keep up the great job.

Excellent presentation, Jim, thank you very much! This is a topic that is far too often misunderstood as people improperly equate "high fault current with high incident energy".

Also, I have discovered an alarming number of people who do not read the instructions from manufacturer on how to properly use a noncontact test instrument..for example the need to be properly grounded to avoid false readings etc. Thoughts of untrained people relying on this method?

At speed of light

Jim. I teach that shock is tramua forced on the body..like car accident, baseball bat upside head. etc. Electri shock is electrical trauma forced on body at spoed of light..Robert from Omaha

What are the arc flash ratings of metal enclosure covers of panelboards and switchgears

how we can Z0 value?

So the lesser of 2 evils is choose an open air circuit if someone suspects there is a AB hazard, in a task.

Really appreciated your efforts and time in this Jim. Great job!

This is a 500kv circuit switcher. The phase closest to the camera has one of the two interrupters failed . You can see the interrupter on the left take the entire arc and the other interrupter dosent open which maintains the arc when the isolating switch starts to open.

let me know how can i contact you

You sir, are an excellent explainer of things.

Ding, hot pocket done

i was looking for harmonics relative to a song on guitar, and now my brain has flashburn.

Great❤❤❤

Thank you so much

Thanks !! How to Create a Six-Pulse Waveform ?

You are the man!

Used to wear I think 12 rated arc flash coveralls at ioc in Labrador . Was always told you would get messed up being launched from the blast regardless. Hopefully won't have to find out.

high level english

Great video this! Straight to the point!

What is the difference between the handbook 70e and the standard 70e?

what is the precentage on the waves (39%)?

Nice video. A great refresher. Are you going to continue the coordination series? Thx

Nice video

Thank you so much! 😄

Great! Valuable information. Thanks a lot🙏

You said a lot and nothing. I have to give you credit for showing real waveforms, not made up waves like most, but you need to take a look at my stuff to see how harmonics really work.

Great Video. I have a question regarding the arc flash, in case a office for electrician is in the switchgear room. Moreover, the location is within the arc flash boundary. So, we are not sure that they have to wear the arc flash PPE all the time or not? Is there any standard or practice that we can refer to? Thanks in advance for your advice.