|
|
Since 1960, the supply voltage in Great Britain in domestic premises has been 240 V AC (rms) at 50 Hz while in Northern Ireland it was 220 V. In 1988, a Europe-wide agreement was reached to change the various national voltages, which ranged at the time from 220 V to 240 V, to a common European standard of 230 V (CENELEC Harmonization Document HD 472 S1:1988).' a8 P1 S6 c& {4 U, |' f* I5 r
9 F9 r e8 v3 R7 `
As a result, the standard nominal supply voltage in domestic single-phase 50 Hz installations in the UK has been 230 V AC (rms) since 1 January 1995 (Electricity Supply Regulations, SI 1994, No. 3021). However, as an interim measure, electricity suppliers can work with an asymmetric voltage tolerance of 230 V +10%/−6% (216.2 V to 253 V). This was supposed to be widened to 230 V ±10% (207 V to 253 V), but the time of this change has been put back repeatedly and currently sits in 2008 (BS 7697). The old standard was 240 V ±6% (225.6 V to 254.4 V), which is mostly contained within the new range, and so in practice electricity suppliers have had no reason to actually change voltages. That means the UK government has done nothing to harmonise with the European voltage because his 240V supply is already within EU 10% tolerance. The electricity voltage keeps unchanged so far in most of his areas. That is why most of UK buyer requests the product must be tested with 240V/50Hz rather than 230V/50Hz. Be safe, your product has better designed for the 240V/50Hz if it will be shipped to UK.7 ^+ L% L; b" X1 C; \: E" J
3 P9 |: E' ^9 W! l
Similarly, Australia has also converted to 230 V as the nominal standard with a tolerance of +10% -6%, this superseding the old 240 V standard, AS2926-1987. As in the UK, 240 V is within the allowable limits and “240 volt” spoken as “two forty volt” remains a synonym for mains in Australian and British English (UK). |
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 )
窥视卡
雷达卡
发表于 2010-9-17 14:43
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
楼主
发表于 2010-9-19 09:55
