1. How good is the physical security in your office e.g. gatepass for equipments coming in/out? You might be able to bring it inside the office but you may not be able to take it out.
2. That might be construed as "stealing" company resources. You bringing in a personal equipment and use company utilities for personal gain - electricity, space or computer space. You'll possibly face HR sanctions if your personal equipment is found out.
3. You'll introdude risk to your companies network infrastructure, opening network ports for mining, etc. What if a malware infects your company's computer/network system thru your miner?
If you are in control of your test PC lab and test internet network that is totally separate from production network and with no need to bring in a personal equipment, better, as that would minimize the risk to your company network and risk of an equipment being personally associated to you as well. Just run a test, not a miner running 24x7.
I really thought it was a Bad Idea but I'm an IT support in a corporate office and they issued me a new Desktop Tower that can be inserted high end GPU. What if I'm gonna bring just a single GPU card regardless on any noise of fans' running all day long or even 24/7.
Well if you can fit multiple cards in a single desktop case and noise is not a problem i'd say go for it. Idk if you have something like maintenance guy that could check that, but that could be potential problem