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looks to much for this time of night date I saw 2003 when it was prepared
re Low votages 220V up 230V 240V down to 230V well thats been done on paper but I still find 240V -246V in Lincolnshire so thats fine! I have to calc at 230V ???? welcome to the real world must be some kind of inflation :)
 
I saw 2003 when it was prepared
:?:

"This page was last modified on 14 June 2010, at 12:38."

"The Electrical Installation Guide (EIG), was until 12/2009 an exclusive Schneider-Electric publication distributed through printing and internet (ISBN: 978.2.9531643.3.6, version 2010). This new WIKI-EIG is now allowing all external contribution for improvement and update. "

:?:


re Low votages 220V up 230V 240V down to 230V well thats been done on paper but I still find 240V -246V in Lincolnshire so thats fine! I have to calc at 230V ???? welcome to the real world must be some kind of inflation :)
BS 7671 also requires you to calculate at 230V, and has done for over 2 years.
 
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BS 7671 also requires you to calculate at 230V, and has done for over 2 years.

A resisitive load ( heater etc ) of 1 Kwatt at 230 volts will take a current of 4.35 amps and has a resistance of 52.88 ohms

The same resistive load when supplied with the UK maximum supply of 253 volts will take 4.78 amps. 10% more than the calculated value for that load.

If the design is to be safe at 253 volts shouldn't the calculations be for 253 volts ( 230 + 10% ) to ensure that no cables are carrying more than their permitted maximum current.

Or do, as I suspect, the regulation / formula allow for this and calculate currents less than the actual capability of the cable.

DIYers... do NOT take that as a reason to go beyond the maximum rated current for a cable. There are more complex equations involving time in the calculation.
 

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