Reverse polarity on outlets, any negative side-effects?
There's no danger to the attached load. AC current reverses direction 50 or 60 times each second depending on what country you're in.
It literally makes no difference at all for the equipment.
Human safety is another matter. The hot/line conductor is generally dangerous if you touch it, while the grounded (&quot;neutral&quot;) conductor is generally (not always) safe. However, if equipment has a single-pole switch, it is only breaking the conductor it assumes is the line conductor. If you have the line and neutral reversed, then the appliance is still energized even if the switch is off.