25 Electrical Exam Prep Practice Test Questions with full explanations VOL 1
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Hello, thank you for your time. Did you pull these questions off the actual test?
Great question! They are not exact matches but similar! Check out this FREE Playlist if you want a step by step guide for passing the test!! czcams.com/play/PLJokxpBhbuUc6LTyszEzt-FR7k8Tz4eMG.html
What year NEC book are you using. I have the 2020 and a 2014 edition and my correction factors are different than yours?
I was just curious on why you use the 90°c column when you are terminating to 75°c terminals?
Videos are more than helping me understand, plus I don’t have to ask a teacher to repeat something they’ve explained. Just rewind and review as I need to. Thankful for them!!
I'm so glad!! Thank you for your support!
Thanks a lot man, you are really helping me with your videos!
This is exactly what I have been trying find, thank you!!!
You're welcome!! Keep up the Good Work!
Hey Perry. I just wanted to let you know how much you helped me. I passed the exam on May 6 and am now licensed! Let's get to it!
Congratulations 🎉🎉🎉🎉🎉🎉
This was exactly what i needed !!! Can't thank you enough !
You are very welcome!
Hi, great job . Thanks
Thank you coach! Crunched down the last 2 days before my test & these videos helped me get the concepts stuck in my brain! Passed the masters exam in Texas 🙏🏽
Congratulations!!!!
This is how you teach someone great job I really understood everything
I love this stuff! Electrical Apprentice here..
sorry let me be more clear the question (11) is what size copper conductors would you use on a 7 1/2 h.p. motor. After you get the flc and do the equation the answer is 30.25 amps. in the answer you drop the .25 and use a number 10. the rounding rules are so confusing and honestly inconsistent but I thought that you had to use a conductor rated for the amps and a #10 isn't rated for 30.25 amps. you and I both know you would use a # 10 in the field but for the purpose of passing the masters test I think you would need to go to a #8
Thank you Coach !
You are one top notch instructor. I used to be a diesel locomotive electrician and I am studying to get my license back. Thank you for the great vids. It’s appreciated.
You can do it!!
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Thank you! I know it can be done! I aced that test back in 2005, but it’s harder now because I am much older. I only lost it because Massachusetts wouldn’t accept Montana continuing Ed.. I was so busy with the railway in Montana and it was Impossible to get back home. Thanks again.
I love your videos and explanations. Thank you.
Thank you! If there's anything I could ever do for you just email me at electricalcodecoach@gmail.com
Thanks for the video. I’m currently going to a trade school to be an electrician and videos like this help me get understand a bit more and also learn more on my time off
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thank you sir!!!!
Good Job!
Excellent video!!!
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This is explained much better
Thank you for your time
You are very welcome! Welcome to the community!! czcams.com/channels/Gx2kgwV88KGMhP5Yr5NnCA.htmlcommunity
Wow I like the idea of looking at keywords to know what to look for in the index
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At 26:35 he sizes the conductors for the load rather than the breaker. I thought the conductors were always sized to the breaker.
Good mornin boss out here gettin it
OoO Let’s get to it!!!!
Thanks
thank you 😃
You are very welcome!
great vid my guy
Thank you!!
Thanks you
You are very welcome! Welcome to the community!
more videos like this please sir. thank you so much. this is going to help me with my test.
You are very welcome! Is there any specific video I can make that you would like?
@@ElectricalCodeCoach i would love a video on 2017 print readings. like circuits/fuses/ohms and how to interpret them. different symbols....i did a search on google and youtube...no one seems to really covering that topic. THank you sir.
@@ChuongNguyen-up9fy, how are you doing your exam, i live in Toronto, Canada hope the topic are same.
Nice practice exam. I'm taking my exam in a couple days. Some things in here I haven't done yet like short duty motors. Could use some Xformer calcs too.
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Hey coach why did you use the 75 degree column when sizing aluminum
on Question 11 you round down (drop the .25)and that allows you to use a number 10 Just wondering where that rule is on rounding down? I know it is .25 over but I thought you need to go to the next largest conductor
I still think you would drop it 4.9 or less it's my opinion
@@ElectricalCodeCoach sorry let me be more clear the question is what size copper conductors would you use on a 7 1/2 h.p. motor. After you get the flc and do the equation the answer is 30.25 amps. in the answer you drop the .25 and use a number 10. the rounding rules are so confusing and honestly inconsistent but I thought that you had to use a conductor rated for the amps and a #10 isn't rated for 30.25 amps. you and I both know you would use a # 10 in the field but for the purpose of passing the masters test I think you would need to go to a #8
i have an issue with question number 15. if i have a commercial building with a 125 amp service/overcurrent protective device (125 amp main breaker panel) that im supplying wire to, and the load on that 125 amp main breaker is projected to be 119 amps, that projected 119 amps means nothing to me in terms of service conductors. Im sizing my service wires to my 125A service a 2/0 aluminum wire is required. the 119 amp load under that 125amp ocd has nothing to do with service conductors i would size my branch wire and circuit breakers to that 119amp throughout my panel that is consuming that load. maybe im reading the question wrong since im translating the question into a real life senario
How come we went to the 90 degree chart if it says it’s terminating to 75 degree terminals and 75 degree chart has THHW as well?
Great question! When doing Temperature Corrections if the wire is listed in the 90°C column you can use the ampacity listed in that column for the correction.
Take that ampacity and multiply it by what ever correction factor or bundling adjustments there are.
Example 95 amp wire in 123° F ambient temperature with 9 current carrying conductors in a 1 inch pipe
95 x .76 x .70 = 50.54 the new ampacity of that wire is now 51 amps
If you had a load that was calculated at 58 amps you would have to select the next larger size wire in the 90°C Column and start the math again until you found one that would cover your amp draw after the corrections were made.
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Electrical Code Coach thank you!
@@ElectricalCodeCoach Doesn't it matter that you are terminating on terminal rated at 75C? By the way, what year code book are you using...my correction numbers are different
@@dezertease I'm a instructor at a local community college in the electrical electronics department and I do not teach code but do teach code if that make sense! Ok so according to article 110.14 (C)(1) second paragraph: Conductors with temperature ratings higher than specified for terminations shall be permitted to be used for ampacity adjustment, correction or both.
So if you notice the wire he used at 11:58 is found in the 90deg column. Next we derate the wire based on the article 310.15(B)(2)(a) and find 142 deg correction factor in the 90 deg column since the wire is rated for 90 deg. The factor is 0.65.
This is the trick. Once we do the math THHW #6 is rated at 75A
in the 90 deg column used for derating. Now since the terminals are rated at 75 deg we use the 75 deg column to size the wire. See what we did? We derated using the 90deg column and size our wire based of the 75 deg column because of the terminal limitations of 75 deg.
using the 2017 my temp correction is 0.93 in the 75 and 0.95 in the 90 yours are in the 60 degrees at .87 ?
I prepare for this test journeyman Washington DC I hope passs
You can do it bro!! If you need my help let me know!
I was literally going to ask, why are you using the nameplate rating when you said not to on a previous question but then you answered my question. I also like your honesty by saying idk why the code switched back and forth. Good information, and very helpful. Thanks
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Question #6 - Regarding the THHW insulation; that insulation is listed under the 75 and the 90 degree columns. What directed you to use the 90 degree column???
If we were doing temperature corrections or bundling adjustments
On the question concerning Ampacity/temperature correction factors. (time,12:50) why would we look at the 90'C column when the question ask for a conductor between 142'F and 75'C?
142 is the ambient temperature we start with the ampacity from the 90° c column because of the insulation rating and then make our final selection from the 75° If you want to check it out we got a pretty cool free 10-week program we cover them and much more! If there's anything I can do to help let me know!
I just started going through your videos, it has been the most helpful electrical exam prep information that I have been able to find online. I am taking my LLE test again next month. Really want to pass!
Keep up the great work!
There is thhw in 75 degree and 90 degree column ,how do you know which one to pick?i don’t get it.plus you stated that was 75 termination thank you.
No prob! if there is anything i can do to help you please let me know! If you Email me at Electricalcodecoach@gmail.com and put "grinding" in the subject ill hook you up with some free testing materials
Hello! When doing the temperature corrections you are allowed to start your calculation from what ever column the wire insulation is listed in. So if you wire insulation type is listed in the 90°C Column and rated 95 amps in the 90° C column and your Correction Factor is .87 your math would look like this 95 x .87 = 82.65 So now your wire is only Good for 83 amps. On a practical level what this does is allows you to still use a smaller wire for your installation despite having to correct for temperature.
Appreciate what you do thank you. I believe it’s question number three or four dealing with temperature correction factor
Where do you find the USE-2 90° And are you using the 2020 NEC book On my book it shows 310.15(B)(1)
Yep, some of the numbers of the tables in the 2020 are different. Have you seen this?
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Please correct me if I’m wrong on 11:13 For adjustment and corrections we can use 90 degree column since USE-2 is on the 90 degree and not on 75 degree . Thanks
yes when doing temperature corrections and bundling adjustments!
I'm having a issue here as I have the 2020 NEC code book, both Handbook and regular ...uhhh there is no 310.15 (B)(7) to look at. I have a 310.15 (B)(1) based on 30deg C and 310.15 (B)(2)based on 40degC...so I am not sure what you are looking at, please clarify
Thanks bro I take my test in Cali on the 19october
You got this bro!
How did it go? im taking mine on the 8th of october?
I’m needing some help with question 3, I want to understand why you go where you go in the nec, and some other things:
1. How did you know to find the breaker rating first in order to size the conductor
2. How did you know where 310.15 (B)(7) was
3. How did you find and know to use table 310.15(B)(16)
4. Why did you look under the 75 degree column in table 310.15(B)(16)
5. Are these journeyman or masters questions
If you can answer any of these questions or anything I’d appreciate it because I just can’t follow your process of answering it.
No problem brother you can find out the answers to all of that in the free 10 week course! It takes you all the way from opening up the code book to complex load calculations!
And if you need any more help please let me know!
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@@ElectricalCodeCoach I went thru the 10 week playlist, and I think i got the answers. It’s just at 7:08 when you mention the protection rating as being what you base the wire size off of. Is that just because that breaker is the rating of the total VAs? And you rate the breaker first to avoid rating it off the VAs after the 83% rule, right? Cuz 310.15 (B) (7) (1) doesn’t mention protection. Thanks
Call me sometime 423-895-9341
I'm was confused at question 7 its all in the wording of the question. I was looking at the math and the table and was like wait a number 8 can carry 55amps. Then it hit me we derated using the 55 amps which gave us 47.85 amps for a #8 after derating and that would not be enough to carry current of 49 amps which is why you went up to a #6 and after derating the #6 the Ampacity is 65.25 amps or 62 amps which is enough to carry the load of 49 amps. Ha ha ha ha.
In minute 15:16 we have 49 amps and with a wire size #8 we obtain 47.85 after our correction factors so why is it that is not enough to cover our load? Thanks in advance
Excellent question! Once you make the correction factor now that wire is only good for 47.85 amps. Anytime you size wire the wire must be able to handle the load regardless of over current or anything else initially.
So now with the number 8 not sufficient to carry 49 amps you must head to the next size and see if it will cover it after the correction.
@ 47:26, How come you did not use the 83% rule for the service?
52kw/240= 216.67x.83= 180 Amps, = 200 Amp Service. 200 Amps x .83= 166 4/0 Aluminum condutor
Thanks!
Nevermind, I just answer my own question, It reads *_Service Conductors_* .
yeah but the .83 reduction is concerning feeders
On question 6, you stated first find which column the wire is listed in. THHW is listed in both the 75 degree and 90 degree column. Why is 90 degree column the correct column to select?
Thank you
Great question! Anytime you were doing bundling adjustments or temperature Corrections you are going to select from the 90° 99% of the time to make your adjustment! After the demand factor is applied that is the new allowable ampacity of that wire
@@ElectricalCodeCoach the question says terminating at 75 degree. why wouldn't we be in the 75 column?
Hello, for question #21. The question asks for the ampacity of an aluminum conductor with 6 current carrying conductors. Doesn’t that mean there are total of 7 conductors in the rmc therefore the adjustment factor should be 70%? I guess it depends on how you read the question maybe?
Great question, typically if it says six just go with whatever it says. Sometimes we can get our self in trouble by trying to fill in blanks that aren't there when testing
FYI, I’m using the 2020 NEC. On question #5, for the answer why are we using 310.15(B)(1) and not 310.15(B)(2) ? Based on which table is used, the answer differs. Can you give an explanation on NOT why they differ, but why we chose one table over another. Thank you.
Great question! There are a few differences in the 2020s but about 97% of the content is the same if you check out this playlist I break down everything it takes to get your journeyman's license and be prepared for your master
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Great question! The reason we use table B1 is because that table is also rated for 86° F degrees
And if you look at the top of our primary ampacity table 310. 16 in the 2020 it is also rated for 86° F
How are you determining the multiplier to use ? Thanks
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What year code book are you in coach?
Hello coach. I have a question for #7.
How did you get .87 for the ambient when the number under 75 degrees Celsius is .93?
great question! you will choose your correction from the 90°C column because our starting wire was 90°C. Thanks!!
@@ElectricalCodeCoach the question directly said it was to terminate on a 75 degree terminals?
correct. but you still choose from the 90C if the wire is listed there for temperature corrections and bundling adjustments, they put the 75C to through you off, it wouldn't matter what the terminals were.
over current protection at 4:16 is confusing,,, were talking feeder size, why dont we use table 310.12? it would make it 3/0,,,, 😁
the .83 % rule is concerning feeders?
Just failed the CA general electrician exam by two questions! kill me. Came here for some commiseration and/or getting s**t on lol.
Hi big fan !! Quick question , 13:20 I don’t understand how you get .65 in the 90*c when my book reads .71 in the 90*c from sliding over from 141-149 , my book is 2017 nec nfpa and even my uglys book reads .71
Great question! If you look close its .65 in the 90° C column of 310. 15(B) (2) (a) 2017/2020
And thank you so much bro! Welcome to the community! And let's get to it!
for question 5. if we are using USE-2 in 90. For a temp factor, wouldn't we go 51-55 F in our 90 degree and get.84? I found your answer in the 75 degree under 51-55F
I'll check it out it could be an error
I was really confused too, I was like that it is not right!
@@ElectricalCodeCoach It is an error it is supposed to be .84
hi there are you teaching on the 2020 code book ?
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when do you know to use size down
Only with motor overload
wich column should we use to size the wire for the single family dwelling75 or 90?
Check out electricalexamcoach.com
one question i have the NFPA 70 NATIONAL ELCTRICAL CODE 2020 and i was loooking at this Practice test but what you are talking they are not in the book what book do you have for this Prac. test thank you for all of the VIDEOS and INFO
Thank you for the comment bro!! Great question! I am in the process of the dropping 2020 Content! this year is going to be a Great one!! For right now the 2017 Content is about 97% compatible with some of the tables being renamed and some of the inputs being different!.. if you notice any and what to share the differences in the Comments that would help the community!!
@@ElectricalCodeCoach thank you for the answer iam learning all about the CODES AND RULES.......to wire a house it not that hard but to know the standers and be prepare for the INSPECTOR will :-O
What book do you use to find all the nec codes? Thanks alot for the help 🙏
Sorry for the delayed response! The best way to look these up is in the code book himself, here is a link for the 2017 version! If there's anything I can do to help you in Life or business just email me at electricalcodecoach@gmail.com
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@@ElectricalCodeCoach thanks alot sir, you're really doing a good job at helping us young people to have a better life,🙏 God bless you
Hi, on the ampacity correction question. I do not see .65 as the correction factor for 142F. I see .58
I am using the 2008 nec Table 310.16
What am I missing?
Yep in the 2008 that table is actually listed right below the ampacity table which is awesome, but it does look like that the correction factor in the is .58 and not .65 stuff your testing from the 2008 you'll just have to adjust that part of the math accordingly! You need any more help let me know!
@@ElectricalCodeCoach Thank you. I thought I was losing my mind!!
This might be a dumb question but how would you have 26 fla but 16.7 flc if amps are current?
That's an excellent question and that would likely never be the case in real life, when I made the question I probably just pulled the number out of my hat knowing that it wouldn't matter what it was we still have to use the FLC lol
@@ElectricalCodeCoach haha alright👍I appreciate your videos.
8:58 how did you get 142 degrees?
Ampacity/temperature corrections. The question is asking for the allowable ampacity of #6 with an ambient temperature 142 F TERMINATING TO 75c terminals. Why did you look under 90c????? Where did you get 90c if the question states 75c right there in black and white. What made you choose 95???
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I'm confused, why can we drop the .25 ? I thought you always size next size up?
Depending on what you are doing. but usually. .49 round down when a decimal occurs in our testing!! Appreciate you bro!
Thank you for the quick response. 👍. So helpful
😐 will the code book be allowed in the testing facility?
Most yes check your state
Got anything for rcw and wac portion.
I don't I'm sorry brother
is this a 2020 teaching??? 310.15 (B) (7) has been removed from the 2017 code!
They removed the table, but the code is still there!
I dont understand why are you using the 90 degree column when the question stated under 75 degree terminals
Great question!! You will use the 90°C column when doing temperature corrections and bundling adjustments! have you see this FREE NEC exam prep program? czcams.com/play/PLJokxpBhbuUc6LTyszEzt-FR7k8Tz4eMG.html
@@ElectricalCodeCoach I was about to ask the same question! So your saying that every time I need to make an adjustment I need to use 90º column for this?
#ECCGIVEAWAYS 2020 Code Book
Question 4. How did you end up using the 75c column to obtain your answer??? It wasn’t in the question. In which case wouldn’t you use the 60c column for your answer?