p228 <u>is</u> where Table 4D5A is... And what has the building construction method got to do with which cable type you use?
building construction method got to do with which cable type you use Nothing.... but it has a lot to do with the values that correction factors are applied to when determining cable size.
Yes, but you look up the installation method in 4A1, and then once you know that you use the appropriate column in the appropriate cable-type table..
http://www.made-in-china.com/servlet/image?compatible=true&tid=2&fid=0&lancode=0&cache=1&id=GQETmWQaettu
you use the appropriate column in the appropriate cable-type table.. Indeed so ... and the appropriate cable-type table is (for std T&E) ? You can even use the one in the OSG and then look at the blue numbers on the right hand side
Page 126 OSG table 4D5A is T&E, 6mm is max 47amps normally in a modern insulated house a good guide is 40amps Ant
Page 126 OSG table 4D5A is T&E, Not saying it isn't.... but it sure aint the correct table to use in normal circumstances
For the normal constructed dwelling it may be prudent to use the correct table found on page 222 4D1B
Why would it not be the one to use in normal circumstances? And if not, what circumstances would lead you to use a different table, which has different ratings because it is for <u>a different type of cable</u>?
A copy and paste from an old IEE wiring matters.. THERMAL AND SOUND INSTALLATION One of the features of a modern dwelling is the requirement in Parts E and L to meet the thermal and sound deadening requirements of the Building Regulations. The IEE recently carried out some work to determine specific ratings for twin with earth cables when insulated in a thermally insulated wall see table 4D5A of BS7671, table 6F of the On Site Guide
Mind if I laugh ? :O:^O:^O Mr. HandyAndy - really well either share the joke with us all thats so funny or contribute something usefull to the disussion... Or perhaps you know nothing again :^O Mr Fooman - Really Really Really
4D5A is the table for flat twin & earth. That is why in table 4A2, if you look up "PVC insulated and sheathed flat cable" it tells you that the applicable current rating table is 4D5. That is why when you look at table 4D5A it is headed "..pvc insulated and sheathed flat cable" That is why when you look at Amendment No 1 2002 to BS 7671, it says: The Electrical Research Association were asked to measure the rating of the standard UK flat twin with earth insulated and sheathed cables. The cable ratings given in BS 7671 were not derived from the direct measurement of this particular type of cable. The rating tables in the International and Cenelec and British Standard (7671) are based on typical type tests, and in the case of table 4D2A, on round cables. The results of the ERA’s work are published in a new table 4D5A. How you can say 4D5A is not the table to use for flat twin and earth cable?