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# Are 250 voltage reading considered to be nominal 240 volts?

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Different countries have different legal limits to how much their electricity supply voltages may vary. In the UK, for example, the nominal supply voltage for residential supplies is 230 V, but this is allowed to vary between -6% and +10%. So, as you can see, and 'actual' voltage of 250 V is within the allowable upper limit (253 V) for the nominal voltage of 230 V. So, to answer your question, you need to check what the allowable variation is at your location (your electricity supplier can confirm this) -I would guess that 250 V would be well within the allowance for 240 V.
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There is no problem making this connection.
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# How you can produce 240 volts from a single phase 3 wire system with a nominal voltage of 120 volts?

you can use two hot wire different phases with a double pole braker .

# Why the supplied voltage is 240 volts but not a small number?

240 v has been found to be a useful voltage because a lower voltage requires more current and therefore thicker wires, which requires more copper sitting around. On the other

# Can you plug a 250 volt appliance to 240 volt outlet?

Yes, the rating on a 240 volt receptacle is 250 volts.