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The problem you have is that your rack and the equipment on it are at or near ground potential (as they should be). Your body is at fault in that you accumulate a charge on it which then discharges to the grounded equipment and rack. Dry air in the winter make the accumulation worse since dry air has more tendency to maintain your body charge.

You might look into a carpet that is less static prone, but often just getting up from a piece of furniture can "charge you up" so you'll get a spark. There are antistatic sprays that make fabrics more conductive and bleed off the charge, and there are air ionizers that make the air more conductive so as to better discharge stray static. These might help.

Another approach is to get a humidifier for your room (as you mentioned). Raising the relative humidity will discharge static and prevent its buildup in the first place. This is the most common solution used in industrial settings where static can be a problem.

Aside from these options, you'll just have to wait for summer. There isn't any magic wiring solution that can be applied to your rack and equipment.
 
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