 Oh hi there. Didn't know you were there. I'm just kidding. Hey a couple weeks ago I posted a video on wire ampacity and I got a ton of engagement on it. Except it was not the kind of engagement I wanted to get. This week I'm going to be discussing why some of you were upset and make sure you stick around to the end of the video because I got some great stuff to talk about and you're not going to want to miss it. Let's get going. So what did have everybody's knickers in a knot? Well it seems like when I did the last week's video when I did a wire ampacity and I discussed insulation ratings and temperature ratings and insulation, I may have neglected to discuss the temperature limitations of the conductors when terminating to different pieces of equipment. Now you might think I thought you taught this stuff. So how can you go ahead and forget something as important as that? Here's the deal. I don't want to make these videos super long. When I was doing the code videos I noticed that they're longer than my typical videos by sometimes like 10 minutes. So what I thought I would do is just kind of break it up in little chunks. So this was coming next, this temperature limitations for conductors. I promise it was coming next but perhaps I should have mentioned that at the end of the last video. So here's the thing, stick around for the end of this video and I'll let you know what's coming up. So if I forgot something, watch to the end and maybe you'll catch me on it, maybe you won't and we'll send me to the stakes. Okay so let's talk about temperature limitations for conductors. It's in the code. So I'm going to look at this as a code rule that we're dealing with out of the CEC, the Canadian Electrical Code. I understand that some of you are Americans and you are up working out of the National Electrical Code. So again if you want all you people who are in the NEC make sure you go down below here and in the comments mention where you find these rules for in the NEC. Now I know that it doesn't automatically always line up and it's not a one-for-one but I do know that there are some rules out there in the NEC that do line up and I believe that this is one of them. So here we go. It says here, where equipment is marked with the maximum conductor temperature limitation, termination temperature, sorry, the minimum size of the conductor used shall be based on the allowable opacity in the temperature columns in tables 1, 2, 3 or 4. With all relevant correction factors being applied as required by rules 4-004 corresponding to the maximum termination temperature marked on the equipment. That is the one thing I didn't mention so we're going to work it off of those tables, the columns, the temperature columns. Now remember we discussed in the last video and there is going to be a link up top here so if you're missing this you don't know what I'm talking about. Up there you see a little I click on that and you should be able to watch the last video or at least see where it is. So I talked about how the installation had temperature ratings and you always had to go with the lowest common denominator. So what this rule tells us though is that on top of that we have to consider the equipment that we are hooking up to and this is here in 2, sub rule 2 for the purpose of sub rule 1 and accept is provided for by other rules of this code where the maximum conductor termination temperature for equipment is not marked, the maximum conductor temperature, sorry, termination temperature shall be considered to be 60 degrees for equipment rated at not more than 100 amps or marked for use with number 1 AWG or smaller conductors and 75 degrees C for equipment rated more than 100 amps marked for use with conductors larger than number 1. So there you go we if we don't know what the equipment is and we know that it's rated at least we can figure out if you better know what the opacity is of that equipment. If it's below 100 amps or not more than 100 amps or up to and including 100 amps you treat it like it's 60 degrees Celsius. If it's exceeding 100 amps then you treat it like it's 75 degrees. So example number one three conductor number six NMD90 is installed in a 60 amp disconnect and the temperature rating is unknown. What is the opacity of the conductor? So what do we do? Let's go over to here and take a look at our table two so this is three conductor number six installed in a 60 amp disconnect. So number six our 90 would be 75 amps but because this is a 60 amp disconnect and we don't know what the temperature rating is of it we're actually going to have to base it as it is 60 degrees C because it is below 100 amps or 100 amps and below. So it's 55 amps is the opacity of the conductor again we're not using any of these columns we have to use the 60 degree column and that's where we get our 55 from or 55. What's the correct size of NMD used insulated three conductor copper cable to feed of 7.2 kilowatt 240 volts wire let's look at our steps here. Step one we're going to take the power and divide it by the voltage so we get 30 amps. Step two the temperature is unknown and the current is below 100 amps. Step three we're going to use the 60 degree column so we're going to the 60 degree column for 30 amps and it's going to be number 10 and there it is step four number 10. So that's it there's not a lot to it it kind of just builds on what we talked about in the last video on wire and opacity so that's kind of where we're leaving it at that so don't neglect the fact that it's hooked up to a piece of equipment and that equipment itself has temperature ratings. Okay I promised you at the end of here that I would offer you something good I have some interactive workbooks you might want to go check out I'm going to leave a link to them below in the description and if you can and if you get value out of these videos I've got a patreon page going I'd love to keep these things moving on and keep these things rolling if you could help out in any way a patreon you get some special perks you get access to the the textbooks actually the workbooks and they're interactive you want to check them out and I'll talk about them later on. If you haven't joined the newsletter yet make sure you hit that link below as well. Have a fantastic week we will see you all on the next week and as I always like to say in the words of Ron Burgundy stay classy. Great story compelling and rich.