Our server room has four cabinets (not fully utilized) and is supplied by several electric circuits from two different electrical services. Some of the equipment is 208V from a 3-phase service and some is 120V from a "regular" 2-phase service. (I don't know how or why the building ended up with multiple services.)
Right now none of the equipment is grounded other than whatever grounding is done by the wiring. E.g we don't have a ground bus bar, the racks aren't grounded (except maybe through the servers, if their chassis are tied to ground internally).
I assume since the cabinets are supplied by different services that there is the possibility of a ground difference, but I don't know whether that's an issue or how I would determine it. Getting all of the equipment onto a single electrical service is probably not reasonable considering the distance from the service panels.
- Should we try to tie all of the equipment together with grounding wires connected to a bus bar in the server room? If so, which service ground (or both?) should we tie it to?
- Should we try to isolate the different electrical services in separate racks and then only connect them via non-conducting fiber (this is probably not feasible given the amount of connectivity and our budget, but we could look into it).
- Should we just leave well enough alone, since we're not noticing any issues?