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>1000V rms AC

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According to BS 7671:2008 Requirements for Electrical Installations, 'high voltage' is formally defined as that 'normally exceeding low voltage', where 'low voltage' is defined as "...(nominal voltages) exceeding extra-low voltage but not exceeding 1000 V a.c. (root mean square) or 1500 V d.c. between conductors, or 600 V a.c. (root mean square) or 900 V d.c. between conductors and earth".

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Q: What is classed as high voltage in the UK?
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What is a voltage transformer and mention its function?

A voltage transformer (known as a 'potential transformer' in North America) is classed as an instrument transformer. It is used to reduce the voltage across a high-voltage load to a value that can be read (usually remotely) by an ordinary a.c. voltmeter, while electrically isolating that voltmeter from the high-voltage system for the purpose of safety. It can also be used to supply an input to a protection relay.


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A transformer that reduces voltage is classed as a step down transformer.


What are the difference between high voltage and low voltage?

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Related questions

What is a voltage transformer and mention its function?

A voltage transformer (known as a 'potential transformer' in North America) is classed as an instrument transformer. It is used to reduce the voltage across a high-voltage load to a value that can be read (usually remotely) by an ordinary a.c. voltmeter, while electrically isolating that voltmeter from the high-voltage system for the purpose of safety. It can also be used to supply an input to a protection relay.


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In the UK, anyone under the age of 18 is classed as a child.


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Wales is a constituent country of the UK, so Wales can be classed as abroad from any country except the UK.


Why is mains voltage 230V?

Yes 230 volts is classed as single phase but it is not the only single phase voltage. If you take any two legs from a three phase system, the voltage from these legs is also classed as single phase. The 230 volt single phase is the output of a transformer whose primary is one leg of a three phase primary high voltage system. The 230 volt secondary is center tapped to give 115 volts before the tap and 115 volts after the tap, hence the common voltage of 115/230 that is used in North America.


What is the number of volts in mains voltage?

In the UK the mains voltage is 240 volts


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