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What is the DEFINITION for Voltage in domestic AC 230 voltage supply?

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charitha jayanath

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When we say 230V in a domestic AC supply does that value represent?Is it the rms value of the fundamental of that sinasoidal wave or the true rms value of the supply?

IEC standards have defined this but I cannot find it out.

If you know the answer or the standards which define the above, please let me know.

Thank you.
 

I have not seen the IEC definition either, but the idea is that it's the rms value because that is the true effective value. It is based on the rms of a sinusoidal waveform. Domestic supplies are ideally an undistorted sinusoid so that the rms of the fundamental is the same as what you call the true rms value.
 

When stated 230V, it is the RMS value, but not the peak value....
The peak value is 230x√2=325V
The image below can help you out....
65_1324566490.jpg

The time interval upto which the voltage between peak and rms exists is very small. That is why it is negligible...
But it comes into consideration when AC is rectified, because, the negative phase becomes positive and the ripple is adjust by a large value electrolytic capacitor....
 
Here is the defined standard by IEC for domestic (230 V) supply:

The nominal voltage of existing 220/380 V and 240/415 V systems shall evolve toward the recommended value of 230/400 V. The transition period should be as short as possible and should not exceed the year 2003. During this period, as a first step, the electricity supply authorities of countries having 220/380 V systems should bring the voltage within the range 230/400 V +6 %, -10 % and those of countries having 240/415 V systems should bring the voltage within the range 230/400 V +10 %, -6 %. At the end of this transition period, the tolerance of 230/400 V ± 10 % should have been achieved; after this the reduction of this range will be considered. All the above considerations apply also to the present 380/660 V value with respect to the recommended value 400/690 V.

(Electrical installation rules, standards - Electrical Installation Guide)
 

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