i wrote a post warning about the thin tape on the back side of the led's sold on reels at least. the tape is easily punctured/sliced/pushed back and allows the circuits to become exposed. there are solder pads at every group of three led's that allow to be cut and soldered on either side of the tape
smoking and red hot wires are a short circuit. same as touching the red wire to the negative battery post. wire gets cherry red hot and now its the same as an eclectic stove top burner and thats how fires stat in walls of your home or cars or now shanties
to find your problem, you have a few choices. use a multi meter and set it to make noise for continuity testing. touch the red/black wires in each set to find what one is ringing out, that is the one with the short
run one strip at a time directly to the battery and find the one with a short in it. it will light and not get hot/smoke if has no short
if you took the paper off the back of the tape, thats not good and you will have to watch for problem more than those who left it on. like myself. i used velcro wire ties and can remove and move it easily and have a smaller chance of of dead shorts on the metal conduit.
only a few things come to mind to stop the shorting out on the conduit.
easy and fast way, use electrical tape and wrap the pipe where the strips sit on them. use velcro cable ties to be able to remove/move them. we aren't on ice all year, so why not use them else where when it gets warm out?
i can think of a few places to use them
use heat shrink tubing on the conduit at contact points
use heat shrink tubing on the strips so they are never going to short on metal again
mount the strips to some thing that you can hang like a light bar. i thought of the clear pvc pipe and do the same with green for under water fishing light bar