# Voltage Frequency Calculations

If i have to design a system around 30kw heaters supplied with 480 volts from a 3phase service.

Purely resistive loads typically have a PF of 1. So 30,000\480 x 1.732 = 36 amps

What would the current draw be for 50hz 480v 3phase? What is the formula to solve for this?

I read something somewhere, which i cant for the life of me find, about a volt frequency ratio; any help would be appreciated.

Thank you in advance.