The stuff that was used here was mostly consumer grade, electricians waned about the outlets not capable to withstand high loads, but somehow their warnings were ignored  . Same applies to the power wires, they get heated a lot, but it's expensive to have thicker ones. Anyways, it's all part of the history now, lessons learned 
Best advise to anyone mining is to keep fire extinguisher nearby. The one that was used during this accident is dry powder based, it works just fine, no need for the expensive stuff. After a cleanup with isopropyl alcohol miners are in the working condition again.