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if 15kw / 230v = 65a then how come as stated in onsite guide that a 30/32a mcb and 6mm cable is adequate for upto 15kw asif it was at 15kw then surely 65a is too much for mcb and cable?

can diversity be applied ?

hi, got a new 4.2kw oven and 5.8kw hob and an existing ccu on a 40a mcb in 6mm will this be able to feed both of above? and if so how would you calculate the demand?

so obvious really, was only looking at circuit from one end if you know what i mean, never thought of whats in the plug.... thanks

been pulling my hair out with this one, and its prob a stupid question but: if a 2x 2.5 cable can be wired into a 32a ring because the combined cable ratings are greater than the mcb, then why is a single spur allowed per outlet if that single 2.5 cables rating is less than the mcb...

great thank you

sorry the question was more hyperthtical, if the circuit can handle the cooker its supplying and the extra load, then is it acceptable to spur from it......

have a 4mm feed to my cooker point, is it acceptable to spur from this to a socket for washing machine or is the cooker point a dedicated circuit for the cooker alone?

what is view on acceptable methods for power to intergrated appliances: 1. fcu above worktop to outlet behind appliance 2. spur to socket in cuboard next to appliance had a bit of an argument today where the electrician had put fcu above worktop and dropped down to a outlet plate to wire...

Can someone give an explanation as to why, the osg says a 32amp mcb is suitable for cookers upto 15kw, which goes against the rules i alread understand for circ design... 15000/230 = 65a? even after diversity the figures dont work out am i missing something or just dumb ?

cu is old rewireable (wylex) can i get a rcbo for these?

thanks eric, can you explain why discrimination is not an issue ie: 20a mcb onto 40a mcb (assume its because im only addressing the rcd side?)

adding addition to radial in bedroom (no rcd protection at all) planning on mounting a seperate rcd next to cu but need to know 20a mcb in cu using 2.5 to 30ma rcd but unsure of the a rating of the rcd does it need to be same or higher than mcb or does it not matter as its earth leak...

actually sorry my mistake, after reading there requirements The NAPIT Certificate of Competence NA-A1A5 fulfils the requirements apparently

doh

not quite sure where this requirement fits in, i know of 2 local guys who both joined napit, and neither have 17th or 2391 and yet are full scope? they both did a one week course with a training centre (lomax) and then joined napit

If a measured Ze is higher than given maximum values from Bs7671 what would you do?

just an update, got results today passed (phew) was a long wait, so a very big thankyou to spark123 and everyone else for the revision papers and all the help i recieved... many thanks

hi, im a student, and struggling with some questions that i cannot find an answer to: just found this post and answers, are they correct as it goes against everything ive been told previously? 1. If main tails are not 25mm do you HAVE to upgrade them before carrying out any work? 2...

yeah you prob forgot to put fuel in it