This sounds like you don't know much about conduit, and you're proceeding anyway, which will produce a homebrew hatchet job. Don't do it. Follow Code, and skill up as needed.
PVC conduit must be buried with 18" of cover. If you don't want to dig that far, use Rigid Metal Conduit (RMC or IMC) which requires 6" of cover. Cover means dirt on top ...
First off, you're not allowed to assemble conduit around cable. It has to be a continuous run assembled to specs. You'd be surprised and how many bends you can pull through with stranded THHN wire when you need to replace it. If you know the cable is bad, you might want to think about replacing it now while you're doing all the rework. Just a thought.
I see several problems.
A quick google of the terms you gave lead me to a quality power supply, but straight to eBay/Amazon for the lights proper. The Amazon items were "cheap Cheese junk" that lacked even a UL listing to assure product quality.
The cheapie lights also came with "pierce the wire" type connectors that jab a ...
Table saw tables are often made of cast iron, which is very susceptible to rust. I keep a plywood cover on mine at all times because a humid day can cause an orange film to form. There are products that help with that, but they need to be applied after each use.
I suggest that you try and cover or seal moisture out of the table, if not the motor and other ...
I think mark f has already answered your question well. I just wanted to add some photos from a similar project I did last year in case these are helpful to you.
I installed a weatherproof cover and box to replace the old ones that supplied my above-ground pool. Fair warning: don't do this at your own pool because my installation was deficient in several ...
I would suggest an update to a extra duty double gang cover.
Extra duty or “in use” covers are made to be used while something is plugged in.
Taymac mx6200 is a cover that has 55 configurations made by Hubbell this will replace your existing cover and it has switch plates and receptacle plates that snap in so your configuration is what you need.
This is a ...
Replace the existing cover (and switch plate) with a new two gang outdoor cover such as one like this:
The new cover seals against the existing outdoor rated handy box via a weather seal.
You will likely need to put a new cover plate over the switch as well. And be sure the Outlet or entire Circuit is GFCI protected since its outside.
I could see two good ways to do this. You could make an open stringer with the top step at deck level, or make a closed stringer with the first step down as in your picture. Either of these will simply attach to your rim / band joist the usual way. You will have to cut slots in the fascia where the stringers attach to the joist.
Laying out the stringers ...
Alumiconns wether screw type or wire nut will be safer, and better than going to a non co/alr fixture.
The fixture would need to be a GFCI fixture or protected by a GFCI device upstream
note not to be a pain but this fixture would normally require tamper resistant features most internet electricians don’t keep up on that. There are many listed alumacons most ...
To just answer your question, You will need #12 AWG wire which is good for 20 Amps and a 20 Amp breaker.
If you add more information about the location and the heater, we might be able to help out with the installation.
Don't use flexible conduit for your application.
PVC is very easy to bend. I use an electric heat gun like the kind you use for stripping paint. The great thing about bending it is those bends remain water-tight and save you money on couplers.
If you decide to do a conduit-coupler-conduit connection you don't need a threaded connection with gaskets. You ...