Well if you do not even know the motor type at this stage, that changes things rather. Actually it makes a close fitting design all but impossible!

In your place, as well as agitating for some design authority decisions to allow better data to design from, I'd want to have provision for a board for which C and D type breakers are available, maybe even W or Z, and avoiding to share with things that will care if the volts droop a bit - so perhaps put any lights or computer controls or IT kit on a separate sub-main if possible, certainly if the feed to the motors is any length. You have not yet indicated the motor power, but I presume it is not more than something like single figure KVA, or the additional expense of a variable speed drive, as well as reducing the inrush problem, becomes worth considering because it will allow fine tuning of the power consumption once in operation.

Whatever you do, any fusing or breaker provision will have to be a pretty loose fit, set really to be good for clearing dead shorts in the supply cables, while  the protection for the motor (overload) will need to be handled in the control gear for motor itself. In turn depending on supply impedance you may need to use an earth leakage relay or large delay RCD or similar if the Zs is not low enough to clear the relatively slow blowing breakers or fuses promptly against an earth fault.

Please accept my apologies if this is either not relevant or stating stuff that you already know - I do not really know your situation.

Mike.

Well if you do not even know the motor type at this stage, that changes things rather. Actually it makes a close fitting design all but impossible!

In your place, as well as agitating for some design authority decisions to allow better data to design from, I'd want to have provision for a board for which C and D type breakers are available, maybe even W or Z, and avoiding to share with things that will care if the volts droop a bit - so perhaps put any lights or computer controls or IT kit on a separate sub-main if possible, certainly if the feed to the motors is any length. You have not yet indicated the motor power, but I presume it is not more than something like single figure KVA, or the additional expense of a variable speed drive, as well as reducing the inrush problem, becomes worth considering because it will allow fine tuning of the power consumption once in operation.

Whatever you do, any fusing or breaker provision will have to be a pretty loose fit, set really to be good for clearing dead shorts in the supply cables, while  the protection for the motor (overload) will need to be handled in the control gear for motor itself. In turn depending on supply impedance you may need to use an earth leakage relay or large delay RCD or similar if the Zs is not low enough to clear the relatively slow blowing breakers or fuses promptly against an earth fault.

Please accept my apologies if this is either not relevant or stating stuff that you already know - I do not really know your situation.

Mike.