In this video we look at resistive loads connected in 3 phase star and delta circuits and figure out how to calculate line voltage, phase voltage, line curre First, if you are asking these questions, I would get a qualified electrician involved. For your safety. Make sure the relay is rated for 230 V, and has margin past that. Make sure the relay is rated for the maximum current it will see. Make sure the relay isn't a latching one. Those stay in a state when they loose power on the coil. Our calculator uses the equation for power in a DC circuit to determine the power absorbed by a resistor, as given by P = V\cdot I P = V ⋅ I. The average power of an AC circuit is the product of the root mean square (RMS) values of the voltage across and the current from the power supply, and the power factor: TL;DR (Too Long; Didn't Read) Perform a three-phase power calculation using the formula: P = √3 × pf × I × V . Where pf is the power factor, I is the current, V is the voltage and P is the power. Single-Phase vs. Three-Phase Power. Single- and three-phase power are both terms describing alternating current (AC) electricity. This way, they get a three phase Star connection (3-Phase, 4 Wire System with Neutral Wire). In the Star connection, Three Phase Line to Line (Phase to Phase) voltages are 400V AC (in US, 208V, 240V, 480V etc) and Single Phase Line to Neutral (Phase to Neutral), there are 230V AC (120V, 208V, 240V, 277V, 480V etc in the US). . The equipment is wired for 250 amp 400 volt service. I need to know how many amps it would pull after using a transformer to step it down to 220v 3 Phase. If I use the general equation Watts = Volts X Amps I get 100,000 watts. If I plug that number into the equation using 220v I get 454.5 amps (100,000/220 = amps), which seems like far too much. 6 Answers. The voltage applied to the load does not magically switch from 230V to 400V when you remove the neutral. The wiring configuration between the supply and the load, called "coupling", determines whether 230V or 400V is applied across the load (s). Take a three phase power supply. The general rule of thumb is that circuit breaker size should be 125% of the ampacity of cable and wire or the circuit which has to be protected by the CB. Let see the following solved examples: Example 1: Suppose a 12-gauge wire is to be used for a 16-ampere lighting circuit with a 120V single-phase supply. For three phase motors, the expected voltage for a 230/400V system is 230V phase to neutral and 400V between each of the three phase supply lines. Check that the correct voltage is applied to the motor using a multimeter. Ensure the terminal for power supply is in good condition. Check the connection bar for terminal (U, V, and W). And, the 380V to 400V, 3-phase line-to-neutral voltages won’t be symmetrical, because the neutral “zero” point is determined by the original 480V supply. Because he would have to use two “custom” single-phase autotransformers, each rated 480V, with a tap at 380V or 400V, his plan would cost the same as a single “special” 3-phase

how to get 400v from 230v