Hello All! Hope all of you have been hanging in there. Wife & I finally got internet back out here in the sticks! WooHoo! I have been asked to bid changing a Single Phase 400 Amp, 120/240V Single Phase Service over to a new Three Phase, 277/480V service, primarily for the customers new 460V pressure washers. An isolated single-phase transformer will be required for his new 120V plugs, lights, etc. Anyone know where I could find information/calculation on sizing the new KVA transformer that I will be needing? Thanks!