What is Incident Energy?

Incident energy refers to the amount of thermal energy that is released at a certain distance from an arc flash event, which is a dangerous phenomenon involving a rapid release of energy due to an electrical arc traveling through the air. The energy released during an arc flash can cause severe burns, injuries, and even fatalities.

Incident Energy Rating: Calorie per Centimeter Squared (cal/cm²)

The incident energy rating is expressed in units of calorie per centimeter squared (cal/cm²). This unit measures the thermal energy that would be imparted on a surface at a specified distance from an arc flash. In simpler terms, the cal/cm² rating helps to quantify the potential severity of an arc flash.

The incident energy rating plays a vital role in determining the level of protection required for electrical workers, as it helps to identify the appropriate personal protective equipment (PPE) needed to safeguard against the hazards of an arc flash.
The Role of Incident Energy Rating in Electrical Safety

• 1. Arc Flash Hazard Analysis: To establish a safe working environment, an arc flash hazard analysis is performed to evaluate the potential risk of an arc flash event. This analysis includes calculating the incident energy rating, which is a crucial factor in determining appropriate safety measures and PPE for electrical workers.
• 2. Selecting Personal Protective Equipment (PPE): PPE is designed to provide varying levels of protection, which are classified based on the cal/cm² rating. The National Fire Protection Association (NFPA) 70E standard outlines specific guidelines for selecting PPE based on the incident energy rating. By identifying the correct level of protection, electrical workers can minimize the risk of severe injuries during an arc flash event.
• 3. Safety Training and Awareness: Understanding the incident energy rating and its implications for electrical safety is essential for electrical workers, as it helps them recognize potential hazards and adopt the necessary precautions. Regular training and awareness programs can ensure that workers are familiar with the concept of incident energy, its rating, and the importance of adhering to safety standards.
• 4. Preventive Measures: By calculating the incident energy rating, facilities can identify high-risk areas and implement preventive measures to reduce the likelihood of an arc flash event. These measures may include updating electrical equipment, de-energizing circuits before work is performed, and maintaining a safe distance from live electrical components.

The incident energy rating in cal/cm² plays a crucial role in ensuring the safety of electrical workers by quantifying the potential severity of an arc flash event. By understanding this concept and adhering to electrical safety standards, workers can minimize the risk of injuries, while employers can create a safer working environment. Regular training, appropriate PPE selection, and the implementation of preventive measures all contribute to mitigating the hazards associated with arc flash events.

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Transcription:

Hi. I want to talk today about electrical enclosures and the space in front of those.

It’s important that we keep those clear with depth of at least 36 inches and the width of the panel that could be opened up.

The reason this is, and this is a contentious thing in every plant I ever worked, plants I visit all the time. This is always a problem. Operations people want to stack stuff in front of the panels, park a fork truck, a pallet, stack some boxes, those kinds of things. To a lot of people, it doesn’t seem like that big of a deal. “Maintenance department’s always complaining we put stuff in front of the panels” and what have you.

Well, it’s not just for the convenience of the maintenance people to get into the panels. Okay, yeah, some of it’s that. But the most important thing is that sometimes a maintenance person, electrical person needs access to electrical panel to shut it off in case of emergency. Maybe someone’s in the process of being electrocuted, being shocked really badly, going to be injured. If we don’t get the panel disconnected quickly, if we can’t access the panel, we can’t open it quickly, we can’t get in front of it because there’s a fork truck or a pallet or a bunch of boxes, we don’t even see it, then that’s a problem.

I worked in a plant one time that had a fire. There was a really old DC drive. This thing had to be from the ’60s. It was just really old and we all knew it needed replaced, but kept babying it. One day, it caught fire, just started smoking and it was getting really bad. If we couldn’t have gotten access to that disconnect to shut that thing off, the fire would’ve gotten a lot worse and could’ve spread to other equipment, possibly destroyed other equipment or injured somebody. So there are times where we need access to an electrical panel.

Probably one of the worst cases I ever saw of a panel being hidden or no access to it is I worked at a plant that was built in the ’40s and we couldn’t find this panel. We knew it had to be there someplace because it was feeding a lot of stuff, but we couldn’t find it. One of the old-timers kind of turned us on to where it was because we would’ve never looked there. It was in the division vice president’s office behind his desk, behind a painting. Yeah, behind a painting. So if it hadn’t been for that guy had been working there for 40 years, we didn’t never known where that panel was.

That’s a dumb place to put a panel, but probably over the years since the ’40s when that plant was built, you know how things change. That office probably was not an office in the ’40s. It was something else. But now it’s an office and we got to hide the panel. The vice president didn’t like the looks of the panel evidently and he didn’t want to hear anything from us about how that’s not right. So it’s probably still that way today would be my guess.

I was recently in an automotive parts plant where they had lots and lots of CNC machining centers and it was important that they, of course, get as many of those machines in there as they can. But what ended up happening is the machines were set too closely to be able to safely work in the electrical panels that were behind the machines. It looked very similar to this photograph here. This is not the actual plant, but very similar situation. You can see all of the CNC machining centers. Then these two are so close and you see that control panel there.

Well, the situation was at this plant to work on that control panel, you had to walk back there between those two machines and you couldn’t gain access from the other end. The other end was closed off by conveyors and stuff, so you couldn’t get there that way. You had to access at this direction. You actually had to walk past the control panel and then open it to be able to work on it. But when you opened it, it wouldn’t actually open 100% of the way, wouldn’t open up to even 90 degrees, so that added a problem. There were stuff on the panel or what have you. That panel door needed to be opened all the way.

Here’s the other bigger problem with that. The panel door wouldn’t fully open because it hit the other machine, the one next to it, right? There’s this protrusion on that machine so when you open the door, it hit that. So you think about this. You had to walk past the control panel, open the door, which then hit the other machine. So in an emergency, you couldn’t run that direction because the panel door had that whole area between the two machines closed off.

Now picture this. If you, gosh, I hope this never happens to you, but if you’re in an arc flash event, two things likely will happen. You will be deafened by the loud sound and you’ll be blinded by the bright light. Now picture yourself back in there between these two machines and an arc flash occurs and you get blinded and deafened, how are you going to get out of there? You may realize what direction you need to go to get down to there and things may still be on fire, but you can’t. You run into that panel that is open and stuck, hitting the protrusion on the other machine. So how are you going to get out of there?

I understand we have to put machines close together, that’ll never change. I mean this production, right? But what can you do to fix that? One suggestion that we came up with for that particular machine was, instead of having the control panel door in one piece, make it in two pieces. It opened up like French doors would, rather than just one piece. Because if that was the case they would both open up, there would be enough.

So we just got to come up with easy ways to figure out how to get our control panels opened, all electrical enclosures fully opened and not damaged and have access in and out of it because we need access to maybe quickly turn something off. We need to be able to get out of there in case there’s a problem and we’re blinded and deafened by the arc flash event.

If you’re a safety professional and it’s your job to keep people from stacking stuff in front of electrical enclosures, maybe this gives you a little bit of ammunition that you can use to convince people that there’s a real reason why we don’t want stuff in front of there. And it’s not just because we maintenance people want to easily access it and conveniently get to the equipment.

There’s a reason we need to, and it’s not just convenience. It’s safety. We need to turn panels off in an emergency. If there is an emergency, an arc flash or something, we need to be able to get out of there. This is one of those OSHA things that should an OSHA inspector come in, these are things that are easy to spot and cost you some money. More importantly than costing the company money is safety. We need access to those panels. We need to be able to get in there and get out of there in case of an emergency, so it’s really important. It’s really important.

I hope this video helped you today so visit our website, electricaltrainingpro.com. Look at other videos that we have there. Suggest videos that you would like to see. My email address is on the screen, so feel free to drop me a line and ask me anything you would like. I answer questions all the time. Thank you and have a good day.

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Video Transcript

Let’s talk about arc flash labels. As I travel around the country teaching 70E classes, refresher and awareness classes and what have you, I see a lot of confusion about when the labels need to go on, what needs to be on them, what can’t be on them, things like that. So let’s talk about that.

First. The owner of the equipment is responsible for the label. Now, that’s very simple if you are a manufacturer, own the building you’re in and you own all the equipment in the building, distribution as well as production equipment, that’s very simple. You own all that stuff. Where it gets a little more complicated is in multi-use buildings where maybe it’s several floors of a building, different companies own different floors. There’s a building in Chicago that I know of that gets a little more complicated. Multi-floors, the building is owned by a real estate investment trust, it’s run by a property management company who employs another company who takes care of all the maintenance, several floors of that building are inhabited by companies that have their own maintenance people, there’s three floors that are a data center for a cell phone company, so they have their own maintenance people. Who owns what equipment and who is responsible for those labels gets a little more complicated. Different people have different motivations for wanting to get those labels on.

So the owner of the equipment, 70E says, is responsible for that label. Now what has to be on that label; obviously nominal voltage has to be on there, the arc flash boundary has to be on there and at least one of the following, and this is where it gets a little more complicated.

(a) Is available incident energy and the corresponding work distance or the arc flash PPE category but not both. So you can have incident energy or the PPE category but not both. And that’s where a lot of people stumble there. I used to own a company that did hundreds of arc flash studies across the nation and it was typical back several years ago where we would put incident energy and the PPE category on the same label. Well, starting in 2015, it stopped being allowed. You can’t have incident energy and the PPE category on the same label.

(b) Another thing that you can have on label is minimum arc rating of clothing. Let’s say that your company has done an arc flash study and has found most of your equipment is say anywhere between two calories and nine calories, so maybe you come up with a label that just says minimum arc rating on all this equipment is 10 or 11 or something like that and then you mark all of it accordingly. It makes it a little bit simpler.

(c) Another thing that you can do is site specific level of PPE that would be a level that you create yourself like say A, B or C and you train all of your maintenance folks what A is and what B is and then from that they know what to wear.

The data on the label has to be reviewed every five years. Now, that doesn’t mean you have to have a complete new arc flash assessment done every five years. It means that you need to review what the utility data is to make sure the utility data is correct and utility’s not built a great big new substation that feed your equipment, that you’ve changed nothing. And I’ve never worked at a facility where you’ve never changed anything over five years, so that’s kind of a rarity in my experience, anyway.

So you would have to confirm and review and make sure that nothing’s changed and if nothing’s changed you don’t need to do a complete new study, but if things have changed in your distribution equipment or in your utility, then you need to redo the study.

Christopher Coache works for National Fire Protection Association and put together the handbook for electrical safety in the workplace. This is the 70E hand book, it’s a companion book that goes with 70E. I highly recommend that everyone reads this, I have it in an e-book, and I read it all the time, just wonderful stuff in there. It’s got everything that 70E has, but then explains in more detail of how we got there, what these things mean and how you could incorporate that. And I don’t like slides with a lot of words on them but these are good words on this particular slide, the employees should not be expected to calculate the incident energy value or to determine whether a job complies with the arc flash PPE category.

So it’s not the employee’s responsibility to figure out what the incident energy rating of that piece of equipment is. It’s not the employee’s job to figure out what the category rating of that equipment is, it’s the employer’s responsibility. The employee needs to know how to read that label to determine what PPE to wear. It’s on the employer to figure out what that arc rating is or incident energy rating is. It’s on the employer to figure out what should be on that label, not the employee. So 70E says that equipment has to have an arc flash label. A lot of people take that to mean that, and it has for years, and people have taken it to mean this, that you do an arc flash assessment, you do an incident energy analysis, then you get your labels. Well, you need to have labels even if you’ve not had that done, even if you don’t intend to ever have that done. You still need labels so you have to put labels on even for the category method. Because there are things that have to be evaluated to use the category method and have to be evaluated by engineers.

There are maximum fault clearing times and maximum fault current allowance on the PPE tables. For years we’ve ignored those, a lot of people but we can’t now, we have to have someone calculate those to make sure that we’re within the parameters that allow us to use the tables. This is where a lot of people over the years have had to skip this because they just didn’t have this done. But you need to have this done. The National Electric Code now requires that you have maximum available fault current labeled on your service equipment. So we need to get this done. So anyway, Christopher Coache, I’m a big fan, he’s got a blog, makes videos, very good information NFPA, his website NFPA xchange recommend that highly a lot of good interpretive stuff, things I’ve learned from this guy. This is good stuff right here.

What needs labeled. Well, equipment that while energized is gonna require servicing or maintenance or adjusting or inspection. So what is that? Is it a motor? Three-phase motor connection box? No. We don’t open those up while it’s energized, generally we don’t, so we don’t need to label those so, but a disconnect, yeah, we have to open those while they’re energized to verify they’re not energized. We gotta do… At disconnects, we have to verify zero volts at the disconnects, and so when we open up that disconnect to verify it’s turned off we still have to treat it as it’s on, as it’s energized so it gets a label.

What about in this photograph, circuit breaker panel boards? Yeah, those need labels because we’re gonna open those and verify the energization. Those are things we open up while energized sometimes. What about that transformer on the floor? No, no, we don’t open those up to work on those. It’s important that the equipment that while energized is gonna be serviced or maintained gets a label. Raceways, condolets, pull boxes, those kind of things don’t, they won’t need a label, ’cause we don’t open those while they’re energized and if we do there’s insulated conductors in there, so. Things that while energized require service, maintenance, inspection need to have a label.

Now, so when it comes to arc flash labels the owner is responsible for it, you can have incident energy or the PPE category you can’t have both, the labels go on equipment that’s gonna be serviced or maintained while energized. The employee should not be expected to go out and calculate the incident energy for a particular panel and put that label on, the employees should not be expected to go out and figure if they can use the PPE category tables. This is things that have to be done by the employer, it’s the employer’s responsibility, and it needs done prior to the maintenance person going out and working on that equipment.

I hope this video helps to clear up some of those issues that I see out there, so make sure we get our labels in compliance, and get those things done. If you have any other questions, there’s the contacts in the link below, please don’t hesitate to give me a call, drop me a line and I’ll answer any kind of questions you got. Thank you very much.

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If you had to give an elevator pitch for electrical safety, the kind of pitches that sales people make all the time,  what is that thing that you would tell the prospective client before the elevator ride ends to sell them on your product or service? This is my elevator pitch for electrical safety. A client or somebody asks what do we have to do in our company, to comply? It’s pretty simple and if you boil it down to its smallest fundamentals, the elevator pitch would be each employee has to be qualified for the electrical task they are performing and/or the electrical hazard that they are exposed to. This applies to unqualified people as well; even though an unqualified person won’t necessarily be doing electrical tasks, they are going to be exposed to electrical hazards. Hazards like from extension cords to working around or in the vicinity of qualified people opening cabinets. So they’re going to be exposed, so they have to be trained for that exposure, whatever it is.

So saying each worker has to be qualified for the tasks that they’re performing, under the word “qualified” comes 1,000 things. It comes knowing the training, knowing the equipment, being trained on the safety of that equipment and that exposure, the voltage, the arc flash potential. It includes knowing the proper PPE to wear, the proper tools to use, being able to understand the equipment, the operation, construction and operation of that equipment. So there’s a lot to it, there’s a lot more that goes into it.

So simply put, each employee has to be qualified, which means trained, can demonstrate that they know what you’re doing on the electrical task they are performing and the electrical hazard they are exposed to. That’s the minimum, that’s where you gotta start. So if you’re in charge of safety at your facility, if you’re a plant manager or whatever your job is, how would you answer that question? Are your people qualified for the task and the hazard. A simple question put as an elevator pitch.

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Critical Electrical Safety Targets

Make sure these get done!

• De-energize. Unless the employer can justify live work, it is not permitted. Live testing and troubleshooting are allowed, but altering the circuit live is difficult to justify.
• Workers must be qualified for each electrical task they perform, and the electrical hazard they are exposed to.
• Workers must know how to perform a risk assessment, and how to reduce the associated risk.
• A worker must have access to and utilize the appropriate PPE for the electrical hazard.
• Employers need to ensure the worker has access to arc-rated PPE throughout the range of incident energy indicated by their incident energy analysis.
• Test-Before-Touch. A qualified worker must verify zero energy before contacting de-energized parts by performing the Live-Dead-Live test.
• While verifying zero energy, the qualified worker must utilize appropriate PPE and insulated tools.
• All PPE, as well as all tools and equipment with electrical insulation, must be inspected daily before each use.
• The owner of the electrical equipment is responsible for providing labels that include nominal voltage, arc flash boundary, and a method of determining the appropriate arc flash  PPE to be worn.
• Rubber insulated gloves must be electrically tested every six months.
• Arc-rated clothing and insulated gloves must fit the user, and provide full coverage.

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Introduction

This control panel is like thousands of control panels out in facilities today, and maybe even many in your facility. It controls a machine on the factory floor. It has four motor starters, individual circuit breakers for those motor circuits, ice cube relays, small fuses, and a control transformer. And on the door there are pushbuttons, indicating lights, rotary switches. In the lower right

corner of the panel is the main circuit breaker. With the door closed, we can still operate the breaker through the hole in the door. Pretty typical of many control panels. The question is how do we de-energize this panel to establish an electrically safe work condition.

Circuit Breakers

Circuit breakers have a line and load side. The line side is where the incoming power is connected. The load side is where the downstream loads are connected. In this case, the downstream loads are everything else in this panel and all of the motors and other components in the control circuit outside the panel. Everything downstream from this main breaker is being protected from over-currents by this breaker.

The question is, does this circuit breaker de-energize this panel? The answer is no. Opening this breaker de-energizes everything in this panel as well as the downstream loads, everything except for the line side of the breaker itself. When this circuit breaker is opened, turned off, the line side of the breaker is still hot. With the line side still energized by the incoming power, the panel has to be considered energized because the main breaker still has a shock and arc flash hazard. You could not use this breaker to establish an electrically safe work condition for this panel.

Electrically Safe Work Condition

To properly de-energize this panel to establish an electrically safe work condition, you would need to locate the circuit breaker or disconnect that feeds power to your control panel. Your lockout tagout procedures should indicate the location of this breaker or disconnect. Once that is found you would open that disconnect or circuit breaker and apply your locks and tag. Return to the control panel and follow through with all of the required lockout tagout procedures. The most important of which is the live-dead-live test to verify zero voltage. Always Test-Before-Touch. And of course, always wear the required PPE while verifying zero volts. Every circuit has to be considered energized until you’ve proven it’s not.

Troubleshooting Example 1

As a troubleshooting example, let us use a situation in which the operator of this machine reports that one of its four conveyors stopped running. You show up and ask the operator what led up to this problem, and they state that that conveyor has been making a lot more noise than usual. A squealing sound. You suspect a mechanical problem, and on an inspection of the conveyor pulleys, it is evident that a bearing has failed thus causing too much load on the motor. Next, we go to the control panel and see that it has an arc flash label that states an arc flash rating of 11 cal/cm2 and a voltage of 480. We must don the appropriate PPE to protect you from such an arc flash and voltage. Because we are only going to do a visual inspection and we are wearing the proper PPE we can proceed. We do an orderly shutdown of everything the panel controls then open the main breaker. We then open the control panel door and see that the motor starter has tripped for that motor. Everything else in the panel appears fine, we reset the motor starter, and close the door. We place our lock and tag on the main breaker, and we perform all other procedures required by our lockout tagout procedures and proceed to repair the bearing.

Troubleshooting Example 2

In the next example, the operator reported the conveyor wouldn’t turn on. There was no mention of a squealing noise. During our initial troubleshooting, we attempt to turn on that conveyor manually and we hear the motor starter turn on, or pull-in as we say,  inside the cabinet. But, the conveyor is still not moving. We don the appropriate PPE, open the control panel door and begin our visual inspection of the panel. We immediately notice the motor starter for conveyor four is showing signs of heat damage. A  dark smoke-like film is on the area covering the motor starter contacts. This, we know from experience, is an indication of poor contact being made by the starter contacts. The other starters don’t show this damage. Now we know we are going to have to remove and replace the starter or at least disassemble it for inspection and repair. In either case, we’ll need to completely de-energize the panel. At this time we’ll need to close the control panel door and open the main breaker. We then must go to the upstream circuit breaker for this panel, turn it off and apply our lock and tag. Upon returning to the control panel, wearing the appropriate PPE we open the control panel door. Using an appropriate volt-meter, we test that meter on a known live circuit, then measure incoming line leads phase-to-phase and phase-to-ground and do verify that we indeed have zero volts. We then retest the meter on a known live circuit to confirm the meter is still working. That is the Live-Dead-Live test. Now we can remove the PPE and begin our repair work. We find the contacts badly damaged from not making proper contact and the carbon buildup inside the starter is preventing the contact assembly from moving freely. We replace the motor starter, and now all conveyors are working fine.

A Shield May Not Work

Some people have suggested that if you add a plastic or metal shield to the main breaker that covers the energized line leads that should solve the problem. It actually can create a whole new problem. OSHA requires electrical equipment to be “accepted, or certified, or listed, or labeled, or otherwise determined to be safe by a nationally recognized testing laboratory.” Underwriters Laboratory is such a lab. If you add a plastic or metal shield to your breaker, it is no-longer UL Listed because it didn’t have your shield when tested. The shield could cause the breaker to operate differently than when it was manufactured and tested, resulting in an unsafe situation.

Control Panel Design

This next piece of advice doesn’t help you with existing control panels but could make your future panels safer and easier to work with where 70E is concerned. That advice is to ask the OEM of your new panels to put this main breaker in a separate box on the side of the panel. Putting the main circuit breaker in a separate enclosure is becoming quite common now, and manufacturers of these boxes are offering this option. Hoffman’s SEQUESTR line of enclosures is one such offering.

Circuit Breaker Panel Boards

I used a control panel as an example here, but all of this applies to circuit breaker panel boards as well, not just control panels. Opening the main breaker of a circuit breaker panel does not establish an electrically safe work condition. If you’re going to add a circuit breaker, for example, turning off the main breaker for the panel board is not sufficient. You will need to open the circuit breaker that feeds this panel to establish an electrically safe work condition.

Conclusion

In conclusion, it is essential that we know what does and what does not make an electrical panel electrically safe. It must be spelled out in your lockout/tagout procedures which disconnect, or circuit breaker removes power from the equipment that will enable us to create the electrically safe work condition. We will wear the appropriate PPE any time the equipment has an energized circuit component above 50V.

Relevant courses

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Avoiding tight fitting clothing is essential if that clothing is being worn to protect you against the thermal effects of an arc flash. NFPA 70E states that the worker must avoid tight-fitting arc flash gear and that loose fitting clothes provide more thermal protection because of the “air spaces.” I often see and hear about companies adopting the policy of one single arc flash suit should take care of all of our needs. The maintenance department can share the same suit. The policy of one arc flash suit for the entire maintenance department is a big mistake.

An arc flash suit is the heavier arc flash protection needed in incident energy exposures generally above 25 cal/cm2. Arc flash suit hoods are required for any energy above 12 cal/cm2. The issue is this. If one of the maintenance people in your group is 6 foot 4 inches tall and weighs north of 300 pounds and another worker is 5 foot 7 inches and weighs 160, they can’t wear the same suit. But, I have seen situations where this is precisely the case. It is an impossibility that two people with substantially different body types can wear the same suit, and for safety reasons, they shouldn’t be wearing the same suit.

The reason an ill-fitting suit is a problem is that loose fitting arc rated clothing gives you more thermal protection than tight clothes, and, in addition to that, the wrong size suit can obstruct movement preventing you from completing the task safely. What if a major league baseball team all had to wear the same size uniform? I don’t think the fielding, throwing or hitting would be as good because their movements would be restricted. Go Cubs. I am here to argue that an arc flash suit is more important than a baseball uniform. To ensure that everyone is fitted correctly and the equipment properly stored and cared for, professional teams employ an equipment manager. Maybe your facility needs an equipment manager. I know you aren’t working with the same equipment budget as the Yankees. But how nice would that be?

Besides restricting movement, sleeves that are too short can be an issue if you extend your arm and your sleeve no-longer reaches your hand; subsequently, your wrist and forearm become exposed. 70E requires that the arc flash clothing provides full coverage.

One of my favorite comedy scenes in a movie has to be the “Fat Guy In A Little Coat” scene in Tommy Boy. Not surprisingly, small of stature, David Spade’s sports coat did not fit Chris Farley, with hilarious results. Funny in a movie, not amusing with PPE.

Manufacturers and distributors, on their websites, have detailed sizing charts for assisting you in getting the arc flash suit that fits your body. Head to toe measurements are included, and there are different sizing charts for men and women. Most want your chest, waste, height, other manufacturers need your arm length, inseam, among other measurements. One manufacturer states in the sizing instructions that workers under 5’8” and taller than 6’4” need to have a custom suit. Other manufacturers offer sm, med, LG, XL, XXL, XXXL. You would have to figure where you are on this type of a scale.

Here are links to a couple sizing charts:  Oberon    National Safety Apparel

Arc flash suits are expensive, and I certainly understand why companies want to limit the costs of implementing NFPA 70E.  Your company needs to develop a plan for ensuring all qualified workers have the appropriate suit to wear.

Arc flash suits come in a variety of types. You can purchase bib overall type pants and an accompanying jacket and hood. There are regular type pants, with a jacket and hood. It is important that you shop around, look at many websites of manufacturers and distributors. Look at all of the sizing options and determine what is right for you.

A comment I have heard on more than one occasion is, “I don’t want to wear an arc flash suit that someone else has been sweating in.” Good point, I wouldn’t either. Let me state right now, that in my opinion, the only live work we should be doing in an arc flash suit is verifying zero volts during our live-dead-live test required for lockout tagout. Our first step in providing protective measures after we have completed a risk assessment is the elimination of the hazard. Working de-energized. This, of course, will require us to establish an Electrically Safe Work Condition (ESWC). So hopefully no one is wearing an arc flash suit for an extended period of time. I do realize on really hot and humid days you don’t have to wear them very long before you are sweaty.

Arc flash suits have to be stored in such a way that they won’t become damaged. A dedicated cabinet, storage closet or bags will help limit the damage. Some people turn them inside out to help them dry and avoid mold and the suit getting stinky. One helpful accessory that is available is a cooling unit which is a blower that mounts to the suit and provides air flow throughout the suit as you wear it. Another accessory is cooling vests designed to be worn under an arc flash suit.

Your facility needs to have suits in various sizes so all qualified workers are protected through the range of arc flash exposures. This is an expensive garment performing the critical function of protecting the wearer from a high energy arc flash event. A lot of thought needs to go into the proper sizing of arc flash suits and how many we need to buy.

Our Training That Addresses This Issue

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