How should three-phase multi-element wiring be specified for commercial heating elements?

For three-phase multi-element commercial heaters, first divide the total equipment power across phases so each phase carries a similar load, then check each element nameplate to confirm whether star wiring matches line voltage or delta wiring matches phase voltage, so no element sees the wrong voltage. Sheath diameter, material and watt density together set the per-element power limit; excessive watt density shortens service life, so leave margin for the medium and continuous duty. Choose the IP rating for steam, grease or washdown exposure, and fix mounting spacing for heat dissipation and replacement access along with the control type, over-temperature protection and terminal housing sealing. On commissioning, measure phase current imbalance, insulation resistance and the heat-up curve; a large imbalance points to wrong phase grouping or wiring, which must be corrected before continuous operation.