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Discuss "Clever" client derated the cables! in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

HoverSPRX

HoverSPRX

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So I'm currently sorting a CU change and kitchen rewire while also fixings some bodges by a have a go client, came back this week to discover that he has decided to insulate the void between ground and first without mentioning it. Now this has derated all his cables by half as they are tottaly surrounded, am I being a bit OTT or am I justified?

Cooker will now have to be low wattage single oven, fortunately the hob is gas anyway, but with the ringmains would I have to put them on a 16amp or a 20 amp? I know that 32 amp MCB must be below the actual capacity of a 2.5 ringmain but by how much would I get away with 20amp? I don't have the book with me!
 
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HoverSPRX

HoverSPRX

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  • Thread Starter Thread Starter
  • #3
Lol this will be done but I don't think he has the budget at the moment, I have already warned him about the potential of overload I'm not worried about the up and down ring, just the kitchen it's a small house with central heating so ne real requirement for regular high current items except the kitchen.
 
Spoon

Spoon

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Mentor
Esteemed
Arms
What type of insulation has he used?
Can the insulation be moved away from the cable a bit?
 
telectrix

telectrix

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Mentor
Esteemed
Arms
insulation between floors????? whatever next, loft insulation???
 
HoverSPRX

HoverSPRX

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  • Thread Starter Thread Starter
  • #9
Earthwool throughout, I have moved it on the cables we installed as they were accessable still in the most part, but now I'm changing the CU I am of the mind that I should derate the circuits accordingly in order to keep things as safe as possible for now. I can't lift the floor throughout and move insulation for him without quoting as it's a lot to move, it and if he refuses then I need an alternative that doesn't leave me open to blame for leaving in an unsafe condition hence why I am concidering downgrading a few MCBs...
 
C

Cid

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I think you'll be fine after taking diversity into consideration. 20amp rings are perfectly adequate for a small house.
 
FatAlan

FatAlan

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Trainee
Very good point worth considering for future jobs. Must admit that in this day and age of heat and sound insulation it would be prudent to future proof unless discussed with client. Hindsite is a wonderful thing;)
 
Midwest

Midwest

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Esteemed
Arms
Are the cables totally surrounded, or clipped to the joists etc?
 

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