Hello! This was an introductory machine, specify the nominal value, 5 amperes cannot be, maybe a typo? Or at each of the groups? One or three phases? Where did the master come from to decide on the replacement of denominations?
If the input automaton changes, this is live operation, if after the input one, it could de-energize the circuit. Live work is the maintenance of electrical installations without removing voltage from live parts. In Russian - without disconnecting the supply machine, switch or other switching devices. The correct choice of the ratings of the circuit breakers depends on what equipment they supply.
Yes, machines can be connected with one wire. But it is better that it be insulated. Although this is not regulated. Sometimes they are generally connected by buses in powerful cabinets. It was necessary to insist on isolation.
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Adverse consequences are possible with the wrong selection of machines. They can knock out. Or if you touch a bare cable.
I find it difficult to answer the last question. But perhaps this is: What conclusion do you need? To put the object into operation? Then you should go to the organization that supplies you with electricity and will carry out the acceptance of the object.
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