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Hi Guys, A little help please. Ive been asked to install a 3 phase supply to a mortar silo on a new site. The electrical contractor on site didnt want to know for some reason. Information ive been given; 3 phase supply (400-415 neutral + earth). Total max load 5KW Cable run 100m To be...

I dont suppose there was a few thousand metres of twin and earth there for the same money? Dont like this

had assessment today, smashed it with an A pass............time for a pint me thinks!

just to let you know lads had assessment today passed with an A.bloke called phil noyce,really freindly helpful guy.well chuffed!! a couple of pints of the black stuff tonight i think!!

cheers deke,got all of that in place,im sure you know better than anyone how the assesments go and how nerve wracking it can be.

yeah thats true cables there gas is bonded under boiler, maybe ill just loop it onto one of the water pipes under there to and explain that water will be bonded after turn off tap is fitted.first assesment and very nervous!!!!

but it wont be there until new year!! as there is no potential there do you think i would be ok?

got an elecsa assessment next week,was planning on showing him a new build flat so i know everything was done by me and was up to scratch.unfortunatly due to 3 break ins in 1 week the builder is not going to install the kitchens until new year.this leaves me with an issuse as to the main water...

its only a 7m metre run

ok so if i put 16mm on cable tray above insulation cable capacity goes up to 94a ( table 4e4 colum 3) would everyone agree with this??

so whats the answer lads? im looking at 25mm now

no this is each bungalow. if i can't ensure there is no insulation touching the swa i think i will have to go 25mm but i would really like to know the ccc of this but just cant find it in 7671.as ive stated before it only gives ref c,d and e.any ideas where i can find this???

if i dont use swa then there is no mechanical protection therefore rcds are required,as it will have to drop down a wall at the point where meter cupboard is.

asked the builder that very question!! answer i got was thats how we do it. dno supply is in a external box and cosumer unit in a cupboard inside. therfore i have to run a sub main to it. can i ask what would your opinion be septiclecky?

methods 100,101.102.103 are specifically for flat twin and earth cables in thermal insulation.i can only find installation methods c,e and d for swa.

clipped direct is ref method c. but does this not appy to just twin and earth? if i put it on a cable tray so its in free air it becomes ref method e and capacity becomes 97amps

been looking at table 4d4 but only gives instalation methods c,e,d i want it for reference method 101.

hey guys, ive got to put sub mains into 17 new build bungalows. the DNO supply is external about 7m from consumer unit.normaly i would put 16mm swa sub main with 80a fuse to protect it. the trouble is it is the insulation will be>100m fibre glass. what is the current carrying capacity of the...

ive only gone and got it!!!! thank you so much for all the advice.

ive only gone and got it!!!! thank you so much for all the advice.