I am in the process of starting a crypto mining farm. Eventually I will be getting upgraded outlets, but for now I am working with NEMA 10-30 dryer outlets that were installed back in the early 90s.
I probed the outlet and got the following voltages: LINE1 to NEUTRAL: 125V LINE2 to NEUTRAL: 125V LINE1 to LINE2: 250V
The specification on the power supply I want to use on this outlet specifies 100-240V AC with no mention of split phase. https://shop.bitmain.com/productDetail.htm?pid=00020170920224132179WEIOvhXx06D6
My first question: I am assuming that the appliance will not care whether the power is supplied in single phase or split phase. I am also assuming that the appliance will not mind getting 250v instead of the rated 230v since it is within 10% of spec. However it seems a little on the high side, with only 3V to spare. Am I correct in these assumptions?
My second question is regarding the lack of a grounding conductor. It concerned me at first, however as far as I can tell the appliance is wired for single phase. Am I correct in my assertion that since it is wired this way, all current would be carried between LINE1 and LINE2 and that in this use case, the neutral could actually be considered a grounding conductor since it does not carry current? As opposed to when operating my dryer, it uses 125v from LINE1 to the NEUTRAL for the lights and timing mechanism, which would cause the neutral to cease being a grounding conductor. There is nothing else on the line, only one 10-30 outlet on a double pole breaker.
My last question is a more of a curiosity. In addition to the above measured voltages, I was reading about 4.5V AC between the neutral and LINE1 or LINE2 with the breaker OFF. Does this mean some other appliance is leaking current back into the breaker or something else?
All measurements taken with a Fluke 87.
My end goal is to have the highest level of safety for both myself and to protect the equipment. However it will be up to a month before I can get modern outlets installed so I would loose quite a bit of profit during that time span as my equipment is arriving before then.
I have an AS in EET so I feel pretty confident this is going to work but I came here for a second opinion as well as so future miners in my situation may find an answer to this.
Any help/tips/you're going to blow your miner up comments are welcome.