Shower Cable - to be 6mm2?

p228 <u>is</u> where Table 4D5A is...

And what has the building construction method got to do with which cable type you use?

 

:O

 

1) 4D2A is not the data for flat twin & earth cable.

Oh

 

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

 

Mind if I laugh ?

:O:^O:^O



Mr. HandyAndy - really

 

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

 

Hellllooooooo....



Echo



Echo



Echo

 

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&#146;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?

 

16mm2 on a 11kW shower......ferk off