Which side should rough wiring for roof ac be on?

Good to know solid wire should not crack. Maybe I was mis-informed, or have dated info. I have never seen cracked wire either.
Despite any code, I would not think a heavy extension cord would be more fragile than a solid wire clanking around inside an RV wall. Im not sure what the issue would be,
but it will be a lot cheaper to use house wire than expensive stranded wire…

mine cones into the ac from the front of it.

Use the Bobo technique.

Just leave enough wire up there to reach either end. Cut it off if it is too long when you install the A/C.

ScottG wrote:
Use 12awg Romex.

Yes #12 GA on a 20 amp breaker.

ajriding wrote:
Always on the front on ones I have seen, mostly Dometic
Right or left does not matter as the 3-wires from AC will be kind-of looped anyway and hang in the return air space/cavity. The side that the power is attached will likely be where the knobs are located. If middle then middle, if knobs on the right then route the power there.
If you can come from the front then should be perfect, if from the side then, yes, aim at the front 5 inches.

When you say,Romex, do you mean solid copper house wire?
Generally RVers tend to believe that solid wire will be more likely to develop cracks, but the wound/stranded electrical cord (like a heavy extension cord) will not crack due to vibrations on the road.

I always buy a heavy gauge extension cord (cheaper than buying by the foot) and use that for the AC electrical. Im on 6th camper renno.

120 volt wiring in all rv/s is ROMEX. Flexable rubber cord is only used in movable slides. Wiring is per the NEC. Solide wire does not CRACK.

Just run enough wire to the hole to go all the way around it.

Yes, I am using 12g romex. Thank you for the front reply. That's all I needed to know. One of the next few weekends we will get to our lot to remove the AC from the donor and install it in the cargo.

The cargo has the frame reinforced around the vent for AC prep. I am a shop teacher. I have taught construction, electornics, and woodworking. I would use either 12g romex or 10g stranded. I chose romex as that is what is in most campers.

We have ran all wiring for 110 v outlets under trailer in 3/4 pvc with junction boxes. None exposed. All 12v wiring is 14g stranded in sheathing and ran on the inside with grommets wherever it goes through the frame to protect from damage.

All precautions are being taken for electrical. Thanks for the answers

Use 12awg Romex.

The 120VAC wiring need to be at the front of the AC unit.

ajriding wrote:

When you say,Romex, do you mean solid copper house wire?
Generally RVers tend to believe that solid wire will be more likely to develop cracks, but the wound/stranded electrical cord (like a heavy extension cord) will not crack due to vibrations on the road.

Nearly all commercially produced RVs use standard solid household cable ("Romex") for the AC wiring. Wire breakage doesn't seem to be a big problem. Connections working loose are more common, but would be at least as much a problem with stranded wire (for screw terminals). Stranded wire is also not compatible with the self-contained receptacles used in most RVs.

Most extension cord wire would not be approved for permanent installation per the electric code. That doesn't immediately make it unsafe, but it would make it not acceptable per code in most places.

Always on the front on ones I have seen, mostly Dometic
Right or left does not matter as the 3-wires from AC will be kind-of looped anyway and hang in the return air space/cavity. The side that the power is attached will likely be where the knobs are located. If middle then middle, if knobs on the right then route the power there.
If you can come from the front then should be perfect, if from the side then, yes, aim at the front 5 inches.

When you say,Romex, do you mean solid copper house wire?
Generally RVers tend to believe that solid wire will be more likely to develop cracks, but the wound/stranded electrical cord (like a heavy extension cord) will not crack due to vibrations on the road.

I always buy a heavy gauge extension cord (cheaper than buying by the foot) and use that for the AC electrical. Im on 6th camper renno.