How the “Panel Edit” command works in Design Master Electrical RT
Welcome to our training, this is David Robison with Design Master Software, and we’ll go ahead and get started. We are looking at the Panel Edit command in our Revit software today. We go ahead and…we’ve got our Revit project here. I’m going to go ahead and run the Panel Edit command, and this is what we’re going to be talking about.
On the left-hand side in Revit we have a list of all of the electrical equipment as connected in Revit. So this is all your panels and transformers, you create all of that using Revit, obviously, you connect it using Revit, we’re just displaying what is otherwise defined using Revit.
So all your connections and everything you use just standard Revit to make those happen. If I go look at a family, I’m going to pull up a piece of equipment here, when we look at the family category and parameters, the yellow box here, the Panel Edit command it’s looking at everything that is marked as a piece of electrical equipment.
So Revit has all of these different types of families, Design Masters working with electrical equipment, so that’s what’s going to show up in that list. And then electrical equipment has a few different types, has the equipment switch, the other panel board, panel board, switchboard, transformer. We filter out the equipment switches and display just the other panel boards, panel boards, switchboards, and transformers.
So that gets you a list that is pretty much the electrical equipment, the panels and such without having…because sometimes people put like disconnects and other things as equipment switches. So we won’t list those in the Panel Edit everything else. So if you’re confused or you’re curious or trying to figure out why something is or is not showing up in that list, that’s what we’re showing, everything that is electrical equipment family that is not an equipment switch.
Going back to our command here, pull it back up. You’ll notice we’ve got the names of the panels, and then in parentheses, we have some numbers, those refer to the circuit and the upstream panel that the device is connected to.
Just to give you a little more context for how your connections are being made, just a little bit of additional information. If you have transfer switches properly defined with multiple connections that you’ve actually made, the software will display that for you.
So here in this project, I’ve set it up, so I’ve got this transfer switch here this ATS it’s connected to LP1, I also have it set up to be connected to LP2. So you’ll see the ATS, this is actually the same piece of equipment just listed twice, so you see the two different places that it’s connected. The second one we label Feeder 2 just tell you that that’s the second connection.
The one that’s the main connection if there’s anything downstream of the ATS transfer switch, we will list everything downstream of it below the main connection. So I have the single panel being fed from the transfer switch, and it’s listed here, it’s not listed underneath this one. That’s how we thought it was best to show that, because when you put a transfer switch into your model you no longer have a single tree, it’s actually looping back onto itself, so that’s how we display that.
When you run the Panel Edit command we actually use a little bit of intelligence to control what piece of equipment is first selected. So if you’re just in your project and you just click Panel Edit, it’s going to open it up and the top item will be selected because nothing else is active.
But you actually select the piece of equipment. If I select this LP2 B panel and I run the Panel Edit command, it will open it up pointing at that panel. You can obviously go and hunt it down in the tree, and that’s totally fine. But if you have it in front of you, you can select it, run the command, and it’ll save you a couple steps finding that piece of equipment.
Also if you have the panel schedule open, and you run the Panel Edit it’ll open the corresponding panel. So if I run Panel Edit here, it’s going to open it up to EP-2. So again, you could go track that down but this saves you a couple clicks locating that.
And if you’ve got a lot of panels this is… it’s a little bit easier to have it just open it up to what you’re working on. The final little piece of context that the software will use, is if you have a device selected that is connected to a panel, and you run the panel-edit, we will open up the panel that it is connected to. So I’ve had this cooling tower in the model, it’s connected to a panel around the Panel Edit command and it opens up to the CTP panel that it’s connected to.
So that’s just a little convenience feature that we threw in there, that you might not otherwise notice as you’re using the software, but if you’re aware of it, it makes it a little bit easier to use the command to pull up the appropriate piece of equipment. And on the right-hand side, we have all of the information about the selected piece of equipment.
So I’m just going to kind of walk through top to bottom all of the different things that you can set to explain where that’s all getting pulled from. What is displayed here varies a little bit, I’m going to turn off my Windows Update. We will snooze that, go away.
All right, so what is displayed in this right-hand side, depends on what is selected. So panels have a certain set of information, that’s listed here, main disconnect are mostly what you’re going to see, that’s going to be different.
If you select a transformer the main disconnect information goes away, and you add some transformer KVA and K-factor rating options. If you select the transfer switch, we look there, we see it, its probably like a panel, so it’s actually treated mostly like a panel rather than a transformer. But since it has two feeders we actually have duplicate feeder setting sections.
So we have the upstream connection settings, and feeder settings, and then upstream connection 2 and feeder 2 settings. And there’s really no… Revit doesn’t have a concept of like a primary and a secondary or the main in the emergency power, so we just arbitrarily look at them, we assign one to the first and one to the second, and we tell you which connection is which.
So this main feeder is the one from LP1, the feeder 2 is from LP2. And that’s pretty much arbitrary when you make the connections, and if you pull it up with our software. So if it’s wrong and you know you’re thinking that this LP2 that really should be feeder 1 and LP1 should be the other feeder, we have the swap feeder command button for that.
If you click this, all it’s going to do is just rename those within our software, so that this LP2 is now considered the first feeder, and the LP1 is considered the second. It’s purely a convention as to which is first which is second, it doesn’t really matter, but it probably makes sense to have the first feeder be your main feeder, and the second feeder be the emergency.
So the swap feeder is what you can use to tell the software to flip those. And when I did that you’ll notice that since this is now… the LP two is the main feeder, the transfer switch now is the things below it in that section, and this feeder 2 is listed here, as the other feeder.
I’m going to swap it back to how I had it. So what you see depends slightly on what you select, and that will just update as you select the different pieces. Starting at the top, we have the device name that corresponds to the panel name property in Revit, so you can change it here, or you can change it in Revit, it doesn’t matter particularly much where you make that change.
One benefit of making the change in our dialog, is that we actually look for any panel schedules that have the same name, and we rename them also. Revit, once you create a panel schedule doesn’t rename the panel schedules for you. Which is kind of annoying sometimes, so if you change it in our software we actually go hunt down that panel schedule and we rename it there as well.
We then have the description and the upstream equipment, so this is what’s going to show up in the circuit record in the circuit description in the panel it’s connected to, that it’s being fed from. The default value is just the name of the piece of equipment. And then you have the option to override that with any sort of custom value.
So if you want to add additional information you can set that to custom and type in whatever you want there. And just to see where that actually ends up, if I take this, I’m going to change this, we’ll call it panel LP1. If I open up MDP, you’ll see that the circuit description here is saying parallel LP1 that we typed in rather than just LP1.
So that shows up here and our circuit description, it’ll show up on the panel schedules in Revit as well. We list the primary voltage that’s taken from the voltages defined within Revit, we leave all of the voltages to Revit to handle because it has features in there to handle voltages that work properly.
So we didn’t need to make any changes on that, and actually setting those with the tools they have available is difficult and impossible sometimes. So we don’t have the ability to change that here, if you need to change your voltage, you have to go out into Revit, and go to your panel properties.
Let’s see if I can pull my panel here. You actually have to select your panel and find the distribution system and make your change here for your voltage. This is connected to thing so you can’t change it, but this is where you would make that change.
The connected load and the calculated load are the values pulled from Revit, so that’s based upon the items that you have connected, we’re just reporting those values and we give them to you in both amps and in KVA.
The mains rating is pulled from Revit, so that’s using the mains setting that Revit has. We label it main/bus amps, mains is what Revit calls it, bus amps is the name that makes more sense to us, so we call it both just to make that clear.
We have the list of kind of standard bus sizes that you can pull from, so if you have a common size you can just select it. You have also the ability to specify a custom size so you can… if you have something that’s a different size, you can just type that in. Then we have the main disconnect type.
We got three options: main lugs only, breaker, and fused switch. If it’s main lugs only, we have the strip and the frame. They’re ignored because it’s a main lugs only. If you set it to a breaker or to a fused switch, you’ll get an option to then specify the size of your…the disconnect both the trip and the frame size.
This is exported, I believe it’s shared parameters to the panel so you can schedule this stuff within Revit, it also affects the one-line diagram so that on your one-line diagram, will actually change the graphics on the busbar to match what this is set to.
So if it’s main lugs only, it’s just a busbar. If it’s a breaker, or a fused switch, we’ll show the breaker or the fused switch graphic for you. And if you change, it will change it in the one-line diagram as well. So that’s set here at this level. For the disconnect trip size you’ll see that we list all of your breaker sizes that you have defined including the VLC we’ve got basically the copper and the aluminum sizes.
Obviously, your trip is not aluminum, that’s corresponding to the wires that are going to be connected to the panel. Because by default the panel feeder is going to be sized to match your disconnect, and so if you choose… for this one if we chose an AEM breaker, we choose the 80 we’ll get copper feeder.
If we choose this ADAL it’s going to give us an aluminum feeder by default. So you have control there over which type of wires you’re going to have. And then we also have the ability to set the frame size, they can either match the bus amps or you can overwrite it with a specific value if it is something different.
Mounting and enclosure are Revit parameters that we’re displaying here. You can change them in properties in Revit or you can change them in our software, they’re controlling the exact same value. So we just display them here for convenience. Finally, we have lugs, we have standard, double lugs and feed through lugs.
This can well control the graphics on the one-line diagram as to where you have lugs on the panel busbar. Also, you can then…if you use double lugs or feed through lugs, you can make different connections to the downstream panels. So for this MDP, I’m going to change it from standard to feed through.
And on the MDP, there’s not a whole lot that changes there. But then on this LP2 looking down a couple sections to this upstream connection setting, so this is describing how LP2 is connected to MDP, is what the upstream connection setting is looking at.
And we just defined MDP, as a see through, so if we go down to LP2, the default connection type is circuit, we can change that to be a feed through connection. That doesn’t make any changes in Revit, unfortunately, so you still have to connect it to a circuit in Revit, always in order for Revit to work, because Revit doesn’t have the concept of a feed through or a top lug connection.
But we do and in our one-line diagram, we will draft it slightly differently. So if you set that to a feed through connection, will actually change that when it’s drafted in the one-line diagram. I’m going to go ahead and exit, I’m going to take a moment. I’m going to push all of this actually out to the one-line diagram, and go back to being pushed out and pull up AutoCAD so that we can see how these changes that we’re making in the Panel Edit are impacting what we’re doing in the one-line diagram.
So bear with me a moment as I load software, pull up my one-line drawing. All right, so we’re done with the export. Wait for AutoCAD to finish loading, do all the background loading that it does after you’re done loading it.
And we will generate this one-line diagram, and… I remember which panel we are looking at. So we were looking at MDP 2 and LP-2.
So MDP 2 has the feed through connection and LP-2 is connected to the feed through lugs. So that is here, so MDP2 you’ll see at the end of the busbar we have that feed through lugs, and LP-2 is connected to it, rather than directly to the busbar.
So it’s a slightly different graphical representation when you make the connection. So that’s what that is controlling, we can do that. We can also do a top lugs connection. So I’ll take MDP3, we’ll change this to have a double lugs, and we’ll change this downstream panel to be connected on top lugs, and we’ll export all that information out to Revit or out to AutoCAD from Revit.
If I just update, it’s not going to redraw the feeder, because the feeder is already in there, and just a standard practice is we don’t mess with things that are already there. If I erase these feeders and then run our update it, will redo the feeder connections for you.
And then you’ll see that here… kind of messy just because I have everything laid out, we can pull this over here. That’s a little prettier look. It does a connection to the top lugs rather than to a specific circuit. That’s what a top lugs connection that looks like. And that’s all controlled again from within the Panel Edit command.
That’s the definition section of the panel, looking at the transformer, same basic information up there at the top, with the addition of primary and secondary voltages. So transformers…well not this one but a typical transformer has different voltages.
This is the utility transformers so it’s about 480, grab this transformer so there, we got the 480 and then the 120 208 secondary. So you can see both your voltages. And then also we list the transformer KVA, and the transformer K-factor rating, so you can specify those values for your transformer. For both of those, K factor rating that is a fixed list, so you just have what we have, and we don’t actually have an override for anything custom there.
For the KVA, we have our default list, but then you can specify a custom KVA if you got an odd size transformer, which does happen sometimes. Below that is the schedule display setting, with the options for showing the specific piece of equipment and the feeder schedule, voltage drop schedule, fault schedule and on the one-line diagram.
And these are all just yes or no. If you set these top three to no, that actually controls a specific shared parameter and changes that shared parameter from yes to no. And then you can use that to filter what is displayed on the schedule within Revit, is how we do that controlling.
So if we go take a look at say, our fault schedule, and we look in the definition of the filter, we’re filtering it by this DMET fault display value, and we’re displaying it if that does not equal no. So that’s how we actually make that filtering happen.
So if you want to use that on any of your other schedules that would be the way to do it. So that’s what’s going on with that. The show on one-line since we are drafting the one-line in AutoCAD, and we have a little more control, that’s just controlling whether it shows up there or not.
And so if you turn something off, it will not display that item, and everything that’s connected to it will just be connected to whatever’s above it. So for example, if I take this MDP2, change it from yes to no, actually I’ll turn it off on the fault schedule as well. So we’ll take it off of the fault schedule and the one-line diagram, and we will recalculate and run the export.
So that MDP2 is going to disappear and it’s going to look like everything that was connected to it is now connected to whatever was upstream of it, which is just that switchboard I think. So it was MDP, yeah, so there’s LP2 and LP2 B if we look at those, they look like they’re just being fed from…they actually should be looking like they’re fed from that switchboard.
I don’t think it pulled those in properly. I’m going to run a quick calculate, well I just pulled that thing out entirely, we actually should be shifting that tree. Because it looks like those are fed from MDP 1 and that is not correct. I’m making a note of that. And actually there is a reason for that I’m remembering now, the reason is because we’re also showing that in the voltage drop and this tree is shown in both.
And so it’s a little tricky to show it differently and if I set it to on all of them, and then run the calculate that should push everything back. And it does, so now this LP2 is at the same level as this MDP. So all of these look like they’re being fed from the switchboard, that’s how you can… because sometimes in Revit, you have to dummy something in and then you can ignore it on your schedules if you want to.
I’ll make sure that’s exported to AutoCAD. And in AutoCAD, if I do my update, it will pull out that MDP2 so that’s gone, and then it redid all the connections to the thing above it, to the switchboard. So that it looks like it’s not there even though it’s in the Revit model, it’s not being shown on the one-line diagram.
The next section is the upstream connection settings, that is controlling what the connection looks like and the panel that is feeding this piece of equipment. So we’ve looked at the connection type that’s controlling basically the graphics on the one-line diagram when we draft it automatically for you.
Doesn’t actually have any linking to the labeling or anything in Revit, because Revit doesn’t handle this stuff very well. We also have the overcurrent protection trip and frame size, so the trip can default to being the same as the main disconnect or bus amp size.
So basically it’s set to this, it looks if there’s a disconnect that uses that size. If there’s not it uses the bus amps. You can set it to not have an overcurrent protection. So you’ll basically turn it off and there won’t be anything that’s shown or you can set a specific value. Then same for the frame default to the same as main.
I think this is a project where you kind of pulled in some default value so that’s the default or you can overwrite it with a specific value. So those are the options that we have there. Then we have the feeder settings and this controls the feeder to this piece of equipment. We tell you where it’s being fed from, so you just have the context of what you’re connected to, what the circuit number is.
We have the feeder length. The feeder length we can calculate two different ways, and we can also give you a custom value. So you can always select fixed and specify the length of your feeders if you happen to know what they are, or you can use a straight line or a right angles calculation.
And the difference between those two we go look at…there you go, this will allow us to demonstrate it. So the distance from this switchboard to this panel here, if we use a straight line, we are going to go at an angle between the two.
If you can follow my mouse there, it’s going at an angle. And so that will be the straight line, shortest line distance if you like running underground or something like that, that would be a straight line. The right angles is going to go along the coordinates of the building, so it’s going to go across along the wall, and then just straight down to the switchboard.
So it’s the difference of the two sides of the triangle versus the hypothenuse. So this will give you the two sides of the triangle for the length. For both of those, we then… for both the right angle and the straight line, we then add any difference in elevation.
So if they’re on different floors we will see that and we will add that distance. If they’re on the same floor, at the same elevation we don’t take into account the fact that you’re probably going up to the ceiling and coming back down. The software just doesn’t see that, and so it’s not going to add a length, based upon that. However, we do have one other option for that, and that is the feeder make up link.
And this is just a value that is added to whatever the calculated value is. So this is basically for feeder makeup to take into account going up into the ceiling and down actually making the connection within the panel and everything else. It’s a single value that you get project-wide all feeders that have a calculated length will have this value added to it.
That one doesn’t have a panel because it’s not connected feeder, there we go, here’s our feeder settings. You’ll notice that there’s also a default setting here, and then in parentheses right angles. So what that means is it’s using a default that’s set somewhere else, and this is what’s going to be, but that way if you change the default it would change in this panel.
And the default is controlled by the panel upstream, what it’s feeder length calculation method is. So this is set to default right angles. If I go up to my transformer here, and say rather than right angles let’s calculate everything connected to straight lines, if I look at my switchboard, the feeder length is now based upon the straight line distance.
And we’ll talk a little… well, I’ll just finish this discussion of calculation methods. So for each panel, you have the straight line right angle and also the default. So if the default circuit setting for the feeder length is set to default, that then is pulled from options. So the feeder length calculation method straight line at right angles.
So basically, you have one setting for the whole project that you want to set to what most of your panels are. And then all of your panels by default will use that value. Then if you have any specific panels where you know that everything connected to it, is going to be calculated a different way, you can select that one panel, and make the change at the one panel to the other option, just so everything connected to this will be a straight line or it’s going to be at right angles.
And then for each individual panel, you have the option to override that calculation, because one panel is different from the other panels connected to that piece of equipment. And we tell you what the feeder length is. And that’s also where you specify it if you specify the fixed value, just type the number in there.
If you specify right angles, we also enabled this building angle, so if we’re at straight line building angle is ignored and we don’t care about it, but for right angles, we need to know what angle to use for X and Y. If you use zero that corresponds to basically an X to the right, Y up, but if your building is rotated, maybe it’s at a 45 degree angle or 22 or whatever it is, you can rotate that and then the X will be along that angle, and the Y will be 90 degrees to it.
So you can have kind of a shifted axis if you need to, if you got a section of the building that’s at an angle. It’s not going to have a huge impact on the length, but it will have some impact, and so we give you the option to take advantage of that. That’s all the feeder length settings, now we get into the part where we actually size the feeder itself.
The default setting is sized automatically and what this means is that the conductor, the first place it looks is the overcurrent protection trip size. And basically going to match that, and so if the overcurrent protection is size based on something else, the conductor amps ends up being sized based upon that something else.
So here it kind of cascades up to the main disconnect, to the main size. So conductor amps is sized automatically, looks at trips, OCP trip is automatically, it looks up at main disconnect bus amps that’s 400, that’s how we’re going to size it. If we change this… we’ve currently got 600 KCmil wire, we change this to 600 amps, we’ll get two runs at 350.
So it’ll see that that changed and updated for you. You can always override it with a specific size, you can set it to none, and that will turn the feeder off and then the feeder won’t show up anywhere, if there actually isn’t a feeder between these two pieces of equipment, or you can choose a specific size.
And this is where… if for voltage drop purposes you need to upsize things is where you would go to make that change. You can specify the neutral size, default is same as phase so you’ll get your neutral the same as your conductor amps. You can have a double neutral and when you do that, we basically just put a second neutral wire in for you, so your neutral is doubled.
Or you can override it with a specific size, if for some reason in this wire you need to have a different… this feeder you need to have a different size wire you can, with all of your wire sizes listed. Then we also have the ground size default, is sized automatically.
And so this will size it based upon the conductor size and the overcurrent protection size. It also sizes it based upon what is upstream of it, a panel versus a transformer. If it’s a transformer, we’ll size it based upon any C250 102, the service calculation. Because we’ll see that as a separately derived service and that has one set of ground sizing.
So if it’s a transformer or connected to the utility, we use the sizing, everything else we size it as an equipment ground and you see 250, 122. And so we’ll size it based upon that table. So if it’s sized automatically, we’ll choose the table for you automatically and then size using that. If you want to you can override it and say I want you to size it automatically, but use this table or that table if you have a situation where you need to get a specific table being used.
And then you can choose a specific value. I should note that currently, if you upsize your conductors for voltage drop, we do not automatically upsize the ground. And you see it says that when you upsize your voltage drop, you need to upsize the ground proportionally. So you have to manually figure out what size that ground is going to be in and then upsize it as a second step in the software.
So be aware if you’re upsizing your conductors you also need to upsize your ground. Good news though in our next release that will be a new feature where when you do up-size the conductor we’ll assume that you’re upsizing it for voltage drop because that’s pretty much the reason why you would do that, so if you’re upsizing your conductor, we upsize the ground as well.
So that you don’t have to do that second step, so that’s a new feature coming down the pipeline. Then we have the IG conductor option, yes or no, and then if you just set that to yes, you will get a second ground labeled IG. It’s going to be the same size as your ground.
So you have that option and then the conductor size. We will size it for you automatically based upon 40% fill but you can change the size. If you really want to, you can go something smaller, so this is three and a half. If I go to one-inch conduit it will put it in, and it’ll tell you that you’re way overfilled, that you can’t shove all those wires in there.
But you as the engineer have that choice. More frequently you will oversize it if you want to have it bigger for future expansion purposes is typically what people are choosing that for. You have the ability to change that size, or you could choose a different material. We included a couple materials in the software by default, and you can add to this list if you want to have other materials listed.
And you can also set it to none to take the conduit off completely if you’re using a configuration that doesn’t include a conduit. And then at the end of the section we obviously display the conduit fill, we display the actual feeder size, and we display the voltage drop on the feeder itself.
And then the total voltage drop in the system to this point, so the switchboard is connected straight to this utility transformer so the voltage drop and the total and feeder are the same. We choose on these other panels the feeder and the total are different at this point. There’s no load on this panel so the voltage drop is zero, where’s the panel [inaudible], there we go.
So here the voltage drop on this feeder is 0.15% and the total from the utility is 0.7%. So we report those values so you can see them. If you change the conductor size, we will update those for this panel, if you then go… if you make a bunch of changes upstream of this, we’re not going to see all those changes immediately.
So that’s where you can press calculate and that will recalculate the whole building from the top, down. So if you’re just working on just this one feeder, these numbers will update and be correct. If you change anything else upstream, you actually need to run the calculate to see the corrected value. So here we’ve got 0.73%, if I come here to this MDP, and I change it to number 12 wires just to… you’ll see that we still see the 0.73% even though it should be 5% or something higher.
And so that change won’t get picked up until we press calculate to see that that MDP feeder also has changed size, and so now we have the 5.78. You have all those for your main feeder looking again at the transfer switch, those are duplicated for upstream connection 2 and feeder 2 settings.
All exactly the same values just for the second feeder. Then we have the circuit settings option, this is going to control how feeders, where they’re connected, how their links are calculated.
And also how branch circuits are calculated. So in our software, a feeder is anything that’s connected to a piece of equipment. Basically, anything that’s connected to something that could be connected to something else. Branch circuits are circuits that are connected to things that then aren’t connected to anything. So the actual pieces of… equipment connections like elevators and motors, light fixtures, receptacles.
You have the option to have those lengths calculated differently if you need to, both at the project level and each panel as well. If either of these use set to right angles you have then a building angle, and you get a single building angle for your panel because the assumption is that your feeders and branch circuits, they are right angles, are probably going to be at the same building angle within a panel at least.
Let’s take a look at the transformer real quick and see if there are any settings there that are different, no. So the schedule, the upstream, the feeder, the circuit settings, those are all the same for panels and transformers.
And then we get down to fault calculations, and they are different there. Looking first at panels we display the total fault. I’m actually going to specify a fault here so that we have some numbers. It’s at 65,000 amps, run our calculation, so we actually have values to look at.
So if you have a starting fault you’ll then get numbers. We have the total fault including motors, so if you have motors defined in your project, we see those, we include them in the fault. This project doesn’t look like it has anything marked as a motor, so there’s no motor load there.
The utility fault, we can either calculate it for you, which is for most your panels you’re going to set, or you can fix it which typically you have the utility fault at the utility. The utility gives it to you, so you take that number, you punch it in here, and then we calculate everything past that.
If you do specify this number everything downstream of it, is calculated based upon it, and it’s ignored upstream. So we calculated all the upstream stuff ignoring that value. If you do specify a fixed value in addition to default, you can also specify the XR ratio that corresponds to that fault, the default that we give you as five but if you happen to know it, utility gives it to you and you want to specify that you can do that.
So it’s a calculated value we just tell you what the XR ratio is at that point based upon everything that’s been fed into it. And then we have the AIC rating, which corresponds to the Revit short circuit parameter, I don’t remember the name of it. It’s in our fault schedule, if I look at our fields, no it’s not there.
Well, they have some sort of short circuit… short circuit rating is what that AIC rating corresponds to. We have the ability to specify… we have some default values that you can select or you can specify a custom value. And that’s just for convenience being able to specify that value because here you have your fault and so then you can match up your AIC rating.
It’s worth noting the AIC rating is not set automatically, it’s always specified by the user that is very much on purpose because we want you as the engineers thinking about that value. [inaudible] people say, “Hey, how come you can’t set that AIC rating for us?” We could, we could take a look at it and give you a default value. We think that it’s actually dangerous, we want you as the engineers thinking about that.
So you always have to specify that yourself. So that’s for panels. Looking at transformers, they have a little bit more information required for a fault calc, you can specify the impedance percentage and the XR ratio also for your transformers. If they’re calculated we specify default values based upon the KVA, based upon the size of the transformer, and then if you don’t like our default values you can override that with something else if you’ve got different types of transformers with different impedances.
And then the final section is the arc-flash, where you have all of the options and values necessary to actually perform an arc-flash calculation with the software. The first option is whether you want to calculate arc-flash, yes or no, this will include it both in the calculation and then if you set it to no, it will turn it off on the schedule.
So you can turn it off same as you can on the other schedules. Excuse me as I take a glass of water here. And then going down we have all of the other values necessary for the arc-flash, the equipment type, the configuration type, the grounding.
All of this stuff actually feeds back into the arc-flash calculation, the IEEE standard they’ve got various… they’ll look up the tables based upon these choices. We’ve chosen defaults that for most commercial buildings are going to be correct. But you should probably take a look at some of the options if you’re doing something more complex and you’re going to be using our software so that you understand what the other options are.
They are described in our help, if you hover over something at one of our commands and you press F1, it will pull that nicely in our help, on our website. And if I scroll down to the arc-flash section, it describes the equipment type and what choosing a piece of equipment type means.
The IEEE standard doesn’t really describe what it means by any of these things terribly well, so hopefully, their labeling is clear. But it describes the value that’s changing and then how that’s going to impact the arc-flash calculation.
So for each of these selections, we have them described here so that you have the option to at least look at this, and see what the changes are going to be. The gap between the conductors that’s in inches that’s how far apart the conductors are in the panel.
The working distance is how far away the person is going to be from where the arc is going to be happening, 18 inches is kind of the default assumption, but if you have a different configuration you could set that differently knowing that the farther away the less energy they’re going to see. And hoping that that actually ends up being correct.
There’s a lot of assumptions that happen in arc-flash. Like where’s the flash actually happening and how far away is that going to be. Using all of that we figure out the arcing currents, and we list the 100% and the 85% arcing current. You have to specify the arcing times, so to do this you need to go to your manufacturer, figure out what breaker are you using, and pull down their time-current curve, use the arcing currents that we specify here, and specify the time and seconds that it’s going to take for that breaker to trip that current.
Other software, SKM, Easypower, they’ve got their huge list of breakers, the difference between our software and there’s is that they can give you this trip time automatically. So there’s a bit of a tradeoff in terms of remodeling everything in SKM, versus looking up some trip times yourself to calculate the arc-flash and whether you even have SKMs.
So if you have SKM you might want to use it. If you don’t have an SKM you can save yourself some money and just look up some trip times and use our software. The default is two, the IEEE says essentially, the assumption is that after two seconds the person is going to get out of the way. So there’s no reason to use a value larger than two for what we’re working on.
So we set a maximum of two because that’s the longest it would take, and then once you have that trip time it calculates the incident energy which is listed here. And then the required protection level based upon the incident energy in this case, you’re getting X saying you really can’t protect against that much energy.
So you need to do something else to safely work on this. And then the arc-flash protection boundary energy and so you specify the energy level at the arc-flash protection boundary, and then the software calculates the distance.
And so this is the area that people who are not protected how close they can get, mark it on the ground. So when you’re working on the panel, people who don’t have protection on don’t go any closer. So if they do get close as long as they’re just far away they’ll be limited to like just the first or second-degree burns. So painful but nothing life-threatening is what’s going to happen there.
And that is it for the settings that we have. Quickly look at one more thing here before I open it up to some questions. When you are… So all of those values particularly like looking a transformer you have to specify the KVA.
If you’re looking at a panel you have to, in our software, specify the bus size and the disconnect type. Revit doesn’t have good places to put these things for a arbitrary generic family we don’t know what they’re going to be, so we have to with our software specify what those are. If you take a little bit of time, however, and use our Family Edit command, so I’m going to pull up this family in Revit, and in Design Master we have the Family Edit command, this allows you to specify information using our software in the family.
So if we specify this is as a panel, you have a lot of those same options the bus size, the disconnect type, the neutral, and the ground sizing. And if you specify them in the family, they will be populated in your model as well.
So that when you’re using the Panel Edit you actually can’t change them, because they’re set in the family, but will just display them. So that you’re getting tired of setting these all the time for every single panel in your project, it makes some sense to go into your family and make changes here, so that those values are pre-populated for you. And so the panel, and then the transformer has a different set of settings that you can change.
And this is particularly valuable if you have different transformer impedances. Our impedances are kind of an older type transformers, pretty conservative of using new or more efficient transformers, particularly frequently. You can define new transformers, specify the appropriate impedances and then they’ll come in automatically without having to set it all the time in our software and override our defaults that don’t work for you.
That is the Panel Edit command, that took twice as long as I thought it was going to, but that’s good. A lot of good stuff in there hopefully, that was…Thank you, for attending today’s training, and we will talk to you all next month at our next training. If you have any questions as always feel free to email us or give us a call.