Weird electrical thing, figuring out solutions

Follow up:

Electrician came this week and installed a brand new main panel, including proper GFCI breaker to run the pump. I had previously moved the timer to the proposed spot in the pool area, and ran wire to it from the old panel (with plenty of extra for the electrician), through the wall to the timer, and back into the same spot, and then back through the wall in the old location to a STDP switch, which provides a way to turn the pump on and off (assuming it is switched on at the timer) to do things like back flushing the filter. Pump and SWG are powered through that switch as I'd proposed before. This all works great!

Also had him hook up wires I ran to a sub panel in the garage.

And now I want to hook up some outlets in the garage! So I have a question for the electrical gurus related to that.

First, I have a lot of leftover outdoor/underground rated wire leftover. Is there any reason I couldn't just staple that to the wall in the garage to run the circuits to some outlets, and avoid having to buy/mess with conduit too? If that is a big no-no, I'll go ahead with the conduit.

Second, I'm pretty sure you aren't supposed to hook up two wires to the lug on the breaker. The panel is mounted sort of in the middle of a wall, and I'd want the wire to go both to the left and to the right of the panel. So, is it OK to have one wire to the breaker, then go to a wire nut to split to two wires, that then exit the panel and go to the left and to the right? As in my quick, crude drawing (only bothering to sketch the hot wires).1000004810.jpg
 
First, I have a lot of leftover outdoor/underground rated wire leftover. Is there any reason I couldn't just staple that to the wall in the garage to run the circuits to some outlets, and avoid having to buy/mess with conduit too? If that is a big no-no, I'll go ahead with the conduit.
That is a no no, however, if you are installing in a garage WITHOUT drywall such that the wire will be exposed, you are not (per NEC) allowed to run romex without "physical protection". (ref NEC 334.12(B) )As such, if wanting to do it right, it is likely cheaper to use schedule 80 pvc (as technically schedule 40 is also not rated for exposed on a garage wall) with the existing leftover wire you have.

So, is it OK to have one wire to the breaker, then go to a wire nut to split to two wires, that then exit the panel and go to the left and to the right
Almost always, yes. The "almost" is because technically if you are over 75% box fill (a really darn full panel) then you cannot. I have never seen a panel anywhere near 75% fill capacity (ref NEC 312.8)
Keep in mind also that current NEC also requires all garage receptacles and appliances to be GFCI protected (either gfci breaker or gfci receptacle)
 
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