Industrial Maintenance Technician Practice Test 2025 – Your All-in-One Guide to Exam Success!

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What is the formula required to calculate the proper phase voltage across single phase to neutral for a 3-phase 4-wire 240V motor?

240/2

240/1.73

To determine the proper phase voltage across single phase to neutral in a 3-phase 4-wire system, it's essential to understand the relationship between line voltage and phase voltage. In a 3-phase system, the line voltage (the voltage measured between any two of the three phases) is related to the phase voltage (the voltage measured between any one phase and neutral) by a specific factor that involves the square root of 3, approximately equal to 1.73.

In a typical 3-phase system, the phase voltage can be calculated by dividing the line voltage by the square root of 3. Therefore, for a 240V motor operating on a 3-phase system, the calculation for phase voltage would involve taking the line voltage (240V) and dividing it by 1.73. This provides the correct phase voltage across single phase to neutral.

Thus, the formula of 240V divided by 1.73 accurately gives the phase voltage required for proper operation of a single-phase load derived from a 3-phase system.

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240*1.73

240-1.73

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