in after a cowboy, cooker nearly burnt the house down!

[ExArmy]

I have just been to look at a job where i was asked to install a cooker as the previous one had nearly burned the house down apparently. when i took the cooker out there was a large burnt patch (300m accross), loads of charcoal, almost got through 1/2" ply below . when i pulled out the heat resistant flex i couldn't see where it had been plugged into, but it's likely it was plugged into the ring. it is a 3200W cooker from argos, the customer had got an argos technician out and apparently the cookers fine and it was down to the installation. customer reckons it was sat ontop of the connections and it was bodged up, I did try asking the customer to clarify how the cooker was connected up, but couldn't get much out of her! theres a 2.5 T&E running below the worktop behind the cupboards, not connected to anything but still live? but couldn't find where it came from as all the cupboards are full to the brim!

it's only a small house, 2 up 2 down, it's TT, got a 100mA RCD upfront and a 8 way 3036 board with 3 circuits (ring, lights and shower). ZE is 5-6ish ohms. would it be ok to spur it off the ring to a fused spur above the worktop, and then down to the cooker? an just put it on a minor works?
I'm not entirely sure what the line is about working on a circuit without 30ma RCD protection, do i need to add an RCD first or not?

also, the voltage is 250V at this house, 3200W at 250V is 12.8, so it i put a 13A fuse in the FCU then it will be alright? i seem to remember something from college saying all calculations to be worked out at 230V, in which case the current will be 13.9A and it will be more than the fuse rating. probably never blow, but what should i do here?

 

[baazab]

why not run new circuit ,job done

 

[gnselectricals]

Just fit an RCD fused spur to the existing ring all surface mount to supply the oven, check main bonding is in place & stop trying to over complicate things.
Regards Gram

 

[Deleted member 9648]

FFS....4 pages....62 posts and we still cant agree how to connect a cooker...

 

[sedgy34]

FFS....4 pages....62 posts and we still cant agree how to connect a cooker...

She don't cook either lol

 

[Edd]

I think the only way this is gona get solved is for them to go Gas....

Now how do we supply the gas ignition!!

 

[Guitarist]

Get BG in. They will tell you exactly what needs upgrading

 

[telectrix]

my tuppence worth is..... EICR for £150.get the cash in your pocket, then quote for new CU, bonding, new cooker circuit £750.

 

[richy3333]

I disagree, if fitting a new board then all circuits will be protected with 30mA protection so the 100mA could be binned and an isolator fitted in it's position or tails sent straight into the board.

Have to agree. For those that keep referencing the OSG, start quoting the Regs as that's what we work to? Where do the Regs require a 100mA RCD time delayed, or not?

 

[sparks1973]

Yes , you do.
Any cable you install thats buried in the wall needs to be rcd protected , so if youre spurring off a socket for the cooker , then the ring needs a rcd.
Either that or surface fix cable.

well...yes...if at a depth of less than 50mm without an earthed metallic covering such as a conduit....its TT however so i would recommend the RCD be replaced with a 30mA one....its upfront feeding a BS3036 board so it doesnt need 100mA for discrimination purposes does it.....if the c/u is also feeding a garage circuit then the 100mA stand alone RCD could be used to feed that....but i would suggest that a 30mA RCD be used to provide additional potection for all other final circuits....it is of course only a recomendation....it would be up to the client/person ordering the work as wether they wish to procede...or not....

 

[sedgy34]

Just think of all the regs that come into effect when you have a job to do which is paying little also in these economic times, I sometimes ask is it worth it. Not many other trades who have all these things to think about, and headaches.

 

[sedgy34]

my tuppence worth is..... EICR for £150.get the cash in your pocket, then quote for new CU, bonding, new cooker circuit £750.

Your repaired well tel, I would do the same fed up almost every customer pleading poverty these days

 

[sparks1973]

Just think of all the regs that come into effect when you have a job to do which is paying little also in these economic times, I sometimes ask is it worth it. Not many other trades who have all these things to think about, and headaches.

well when i have to think about something sedg...my head dont ache....how about you?

 

[sedgy34]

Ha lol I see what your getting at
My headaches come from 7,8,9 different jobs with different problems which come to lite
not 1 little domestic problem in 1 day.

 

[telectrix]

Your repaired well tel, I would do the same fed up almost every customer pleading poverty these days

yep. 1st decent bit of plumbing i've seen for ages. just still sore where they cut me to insert the tubes.

 

[ExArmy]

went there today and did an EICR, all circuits were fine suprisingly (ring with 12 points, lighting circuit with 7 points and a shower) and there is bonding installed to the gas and water upon closer inspection, and no earth rod. it looks to me like the supply has been made into a T-NCS outside, but not inside a the service head??

outside i can see a cable coming from what looks like the sheath of a supply cable being connected up to the neutral tail. the 2 tails grouped at the top go all the way along the row of houses and into every house, the 3rd one at the botom just runs straight accross, i lost sight of it as i couldn't go through the end garden. if i test at the top of the main switch with N+E probes on the N I got 0.13 ohms, if i test with the earth on the MET (with only bonding connected) then the reading is 4.9 ohms.
so, i don't really know what sort of supply it is. I am going to have to make an enquiry to the DNO on monday morning. but what do you lot think?