If a 1-Phase Supply is 230V, Why is 3-Phase 400V & Not 690V?

When Single Phase Supply Voltage is 220V, Why is Three Phase 440V and Not 660V? If the Single Phase supply voltage is 230V, Why is three Phase 400V and Not 690V?

The potential difference is 230 volts for single phase so the total sum of three phase should be 690 volts, then why it is 440 volts? - Quora

Three-phase Dry-type Power Transformer Isolated Power Adapter 690V 380V 440V to 230V Internal Coil Pure Copper Stable Voltage Transmission 10KVA : : Business, Industry & Science

Why Three-phase Voltage is 440 Volts?

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230V + 230V = 400V?? 3-phase Power Explained

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If a 1-Phase Supply is 230V, Why is 3-Phase 400V & Not 690V?

The potential difference is 230 volts for single phase so the total sum of three phase should be 690 volts, then why it is 440 volts? - Quora

220V single-phase 400V 3-phase converter

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