C13 is not voltage specific, it is good for up to 250VAC. It is however limited to 13A max which is why the s19 uses 2 in parallel.
Yes a C20 to dual C13 splitter is how to do it properly.
Going back years (OK decades) from when they first came into use in data centers I was always taught that you never split them. 1 <-> 1 and that was it.
Has it changed or was I taught wrong?
-Dave
Not really, but... Reputable UL-listed cord makers like Stayonline.com do it as properly as it can be done, basically molding two heavy gauge C13 cords to a male C19 connector. That said, there is still the technical concern of using a C13 cord with a 20A outlet... So, using 2x C14 inlets is still not the best way to power a single piece of equipment (here a PSU) mainly because you must ensure that
both inlets are always powered or un-powered together but at least for this application it works.
In the case of server PSU racks using n+1 arrays of smaller PSU's to feed a common output bus- the trusty HP CS PSU's come to mind - splitter is still definitely a no-no because if just 1 part of the cord goes bad you lose 2 supplies.
Why BM chose that route over using a single C19 inlet like Canaan does with their Avalons raises all sorts of questions about what they are doing.
Are the power inlets bused together inside of the PSU and feed 1 monster PSU or do they independently feed 2 smaller PSU's that work in master-slave mode?