Electricians in the house? Copper vs AL exterior commercial

[YY1]

Another thing bothering me, and why I'm planning the recep circuits, is that all four of these 20x22 bays are on the same 20A lighting circuit for lights and all existing receps (2 per bay)!

I think that's asking for trouble.

What's funny is that this is a 10 bay building, and there are four 20A lighting circuits.

Did the engineers spec four units on one circuit and only 2 units each on the other three.
That's crazy to me.

 

[YY1]

I appreciate everyone's input on this.

Something else I'm considering is making my temporary #6 compressor circuit in 1" EMT.

That way, if I decide to move the sub panel later, I'll already have most of my pipe and fittings.

I HATE doing things twice!

 

[Mike67]

You csn get 16#12s or 10 #10's in a 3/4 emt.
Derating Factors: Current carrying conductors (Table 310.15 (B)(2)(a)) - (nuetrals and hots only)
4-6 80% (-20% of rated ampacity)
7-9 70% (-30)
10-20 50% (-50)
21-30 45%
31-40 40%
I wouldnt recommend going over 6 though...

 

[YY1]

So, I'd have 2 #10, and 4 #12.

Either a 1/2" run deducted to the compressor and another 1/2" for the two recep circuits..

...or all in the same 3/4 run to a break out box.

...or all in 1" as stated above for the possible re-purposing plan.

...or just buy cheap PVC and use my existing #6 for the compressor and stop churning on this for a while.