Calcs for supply currents to a delta connected appliance.

Have wired some offshore catering equipment comprising 2 heating elements and 1 lighting tx,all 3 wired in delta and designed to run at 480v,no neutral.

Have measured the current in each phase at 415v but wondered if I can find the current values on site by multiplying I x480/415.The 3 loads are dissimilar.

Otherwise,I would have to draw a vector diagram.Thanks for any help.

                                     Regards,Hz