Not a course, but this book taught me a lot about wiring as I completed my basement. Ended up doing all wiring myself including 3 new circuits. Something that can kill you or burn down your house is always intimidating, but in reality it is pretty easy after understanding basic concept. Your local library probably has a copy too.
Always shut circuits off in breaker box and buy $9 outlet tester at hime depot if working on those.
Good luck
https://www.amazon.com/Black-Decker-Complete-Wiring-Updated/dp/0760353573
That's like pouring a 5-gallon bucket into a tea cup and saying you just overestimated the volume of the tea cup. I think you should do some studying before doing more electrical work.
https://smile.amazon.com/Black-Decker-Complete-Wiring-Updated/dp/0760353573/
The reason you should do it is that it's a code requirement. And code is more about safety than about interference, although it might help that too.
But there are a lot of other code requirements for an outbuilding, including that you should feed it with only one circuit.
I suggest getting a book or hiring an electrician.
https://smile.amazon.com/Black-Decker-Complete-Wiring-Updated/dp/0760353573/
https://www.amazon.ca/Black-Decker-Complete-Wiring-Updated/dp/0760353573
Best $30 I ever spent. Finished a whole basement, added new circuits/breakers, A/V... everything. Electrician neighbour came over before I drywalled and said everything was fine.
You are not the problem, the crew is the problem. Tell them to find more grunt work for you to do, you need more time on the basics. Also get this book. We also had a copy on the jobsite and its what I gave to my students in the classroom. Its is epic.
Black & Decker The Complete Guide to Wiring, Updated 7th Edition: Current with 2017-2020 Electrical Codes (Black & Decker Complete Guide) https://www.amazon.com/dp/0760353573/ref=cm_sw_r_apan_glt_fabc_0GC0CDBR255CQTSC0MK9
Reason not to would be if you don't know how to do it correctly and safely. Or if you aren't properly equipped.
I would get a book, like maybe the Black and Decker one. Ebook or paper. Read the intro sections. Ask us any questions.
Electric wiring is fairly easy to learn in an afternoon. I recommend the Black and Decker Wiring book. It’s a quick read and you will learn everything a homeowner needs to know to understand and safely work with it in your house. https://www.amazon.com/Black-Decker-Complete-Wiring-Updated/dp/0760353573
with respect, you should call in a pro if these are switches you want installed sooner than later... electrical wiring (even just 120v) is not something to guess around with if you're not clear & certain of what you're doing.
i'm not an electrician, but i've learned a ton about proper (i.e. code-compliant) residential electrical since buying my house many years ago - I knew zilch at that point... we all start somewhere -- i took a local community ed class, got a book on basic resi wiring (like this), and found some respectable online diy/electrical forums to lurk in for soaking up good info.
residential electrical isn't rocket surgery, but it's not something you can learn overnight either.
It's not very hard, the electric code is very thorough so it is mostly just following instructions for common situations. But it is electrical so if you are not comfortable at any stage call an electrician.
If you are handy, download a copy of the NEC and pick up a home wiring guide book from the library (they also usually have one you can read in the electric dept of any home improvement store). This one is commonly available and should cover everything you need to know to install a subpanel.
> I did not make note of how the wiring was hooked up
Not a problem! The bathroom is a great place to learn how to wire. You will need to make some drawings - the best way to do anything electrical is making diagrams. You'll want one that shows you where the switches and lights and receptacles go, this is for running the physical wire, and then you might want to make a switch and receptacle outlet diagram, that shows what wires go where. There are tons of examples online.
>so I don’t need to install new ones
Technically yes, but technically no. I'm guess you didn't pull a permit, no biggie but might as well do it correctly. By the book, a bathroom needs a dedicated 20 amp circuit that supplies a GFCI protected receptacle(s) and the fan/illumination. So, you really should run the 12/2, my money for the 20 amp rule is for the accessories of the hair care variety, and maybe bathroom toast or coffee?
As far as the wiring goes (and the drawings will really help) you take your primary power in to the main switch box (if coming from ceiling).
As far as the technicals go, this book was a highly recommended book by multiple contractors as far as the regs, and this book covers just about everything on how to do the actual work. I highly recommend both.
A Worded Diagram for you to start with
Main Switch box - Power In - Overhead Light Switch * - Fan Switch * - Outlet Power Out
Receptacle Outlet Box - Power In (from switch box) - GFCI Outlet - Power out for additional boxes (if more than 1)
Bathrooms are pretty easy, it can seem super complicated but with a few hours and a good set of plans it will be a walk in the park.
I don't think they sell that anymore, but you can find used copies elsewhere.
This one from black and decker is also supposed to be good.
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I got a lot of help from older editions of the Black&Decker books; here's an updated one:
https://www.amazon.com/Black-Decker-Complete-Wiring-Updated/dp/0760353573/
And I generally like any home improvement book from Taunton Press
https://www.amazon.com/Wiring-Complete-3rd-Michael-Litchfield/dp/1631868381
These are a few of the books I used. I also watched a ton of YouTube videos.
https://www.amazon.com/gp/product/0760353573/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/0760362513/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
https://www.amazon.com/Black-Decker-Complete-Finishing-Basements/dp/1591865883