kingnewport Posted June 7, 2014 Report Share Posted June 7, 2014 Hey all. I've got an 6.6kw induction hob and I've got 10mm cable from the board on a 40 breaker. Now the question is can I put a 6mm cable from the hob to a cooker junction box. Because I'm currently using 10mm but it's to thick to tighten the screws in the junction box. Cheers all Quote Link to comment Share on other sites More sharing options...
glb8686 Posted June 7, 2014 Report Share Posted June 7, 2014 Junction box? You mean the cooker outlet on the wall? 6mm2 is fine for 6.6kw Quote Link to comment Share on other sites More sharing options...
kingnewport Posted June 7, 2014 Author Report Share Posted June 7, 2014 Yer . Cooker box . Chunky thing . Tidy ill go get sum. Quote Link to comment Share on other sites More sharing options...
djgeoff Posted June 7, 2014 Report Share Posted June 7, 2014 (edited) yeh 6mm ok but if you are using cooker supply in 10mm jut to supply hob unit then 40mcb too big 30/ 32amp mcb would give closer protection and due to the size of the 6mmm cable 6.6kw 6600 w divide by 240v = 27.5 amps you need cooker outlet point not junction box Edited June 7, 2014 by djgeoff Quote Link to comment Share on other sites More sharing options...
kingnewport Posted June 7, 2014 Author Report Share Posted June 7, 2014 Cheers all Quote Link to comment Share on other sites More sharing options...
lexikia Posted June 7, 2014 Report Share Posted June 7, 2014 The 40a MCB is there to protect your 10mm cable not the appliance. If you use 6mm cable, you should de-rate the mcb to 32a as previous post states or add protection between the 10mm and the 6mm Quote Link to comment Share on other sites More sharing options...
superspark Posted June 7, 2014 Report Share Posted June 7, 2014 General rule of thumb, every time there is a reduction in cable size it should be fused down accordingly. Example, a spur off a ring circuit would be fused at the reduction side to protect cable there on in. The same thing happens in 3 pin plugs, 13A for microwaves, 5A for some large TV's 3A table lamps etc. Remember, the fuse is the weak link when something goes wrong. Quote Link to comment Share on other sites More sharing options...
houlsby Posted June 8, 2014 Report Share Posted June 8, 2014 As above just fuse it down at the point of knocking down in size. So you just fit a fuse spur at the side of the cooker outlet. Quote Link to comment Share on other sites More sharing options...
HDAV Posted June 8, 2014 Report Share Posted June 8, 2014 As above just fuse it down at the point of knocking down in size. So you just fit a fuse spur at the side of the cooker outlet. Not see an 30A spur...... Quote Link to comment Share on other sites More sharing options...
superspark Posted June 8, 2014 Report Share Posted June 8, 2014 If you want to keep both hob and cooker, derate the 40A fuse to 32A. Then run the 6.0mm cable. This is allowed and you would be using the cooker and hob on whats know as a diversity allowance, example, you could use any combinations of the cooker and hob but not all rings of hob and cooker at the same time " diversity". Alternatively, run in another cooker supply to run all rings and cooker at the same time Quote Link to comment Share on other sites More sharing options...
apache Posted June 9, 2014 Report Share Posted June 9, 2014 For the short run, with no derating 6mm will take 40A. Quote Link to comment Share on other sites More sharing options...
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