just failed eicr

[glasgospark]

1. shower had incorrect isolation switch
2. shower wired in 2.5mm cable
3. shower suppl not on its own circuit
4. earth not connected for circuit 3
5. no earth sleeving circuit 4
6. faulty switch on kitchen socket
7. every circuit apart from the cooker had failed the insulation resistance test

thus the test conclusion was unsatisfactory.


guy then asked so all i need is to retest in 10 year :S

he was positive he doesnt need to rectify

property was rented out and he was landlord

 

[Guest55]

Without meaning to sound like I'm taking a pop at you, which I'm not as I don't know you, are you confident that you are testing correctly? As with those figures something is seriously amiss somewhere.

exactly , its highly unlikely that those IR reading are caused by the cables themselves
more like duff jb's and poor terminations.
i'd be doing more investigating before advising a rewire of pvc thats only 30 years old.

 

[glasgospark]

i unplugged everything , the shower circuit was in with ring main on 2.5mm ,which had melted in the shower so 0.00 was expected there
surge protected ext i unplugged , didnt test between lives only L-E N-E

really cant understand this

 

[glasgospark]

exactly , its highly unlikely that those IR reading are caused by the cables themselves
more like duff jb's and poor terminations.
i'd be doing more investigating before advising a rewire of pvc thats only 30 years old.

havent advised rewire as of yet , told him the extent of repair could be investigated

 

[robsparky1975]

I would do a global L-E test first,all breakers on,then 1 by 1 flick off and see where the culprit lies.As mentioned if all circuits were in service its impossible to have 0.00 on L-E without something going BANG.

 

[Toonlad]

Normally if i get such bad readings on a 25/30 yr old dwelling as you have gave example of. I will get my other meter out to double check. But i have that luxury at the moment. If i didnt i would get my mates to check against.

 

[Silly Sausage]

I would do a global L-E test first,all breakers on,then 1 by 1 flick off and see where the culprit lies.As mentioned if all circuits were in service its impossible to have 0.00 on L-E without something going BANG.

Remember, 0.00 on IR tester could be a resistance in the order of several kOhms.
Depending on the resolution of the instrument.

 

[Guest55]

Remember, 0.00 on IR tester could be a resistance in the order of several kOhms.
Depending on the resolution of the instrument.

a measurement of 0.00 Mohms could potentially be 9999 ohms.

surprise pedantic inspection over.
;-)

 

[robsparky1975]

Good point archy,glasgo what range/resolution has your meter got.

 

[robsparky1975]

a measurement of 0.00 Mohms could potentially be 9999 ohms.

surprise pedantic inspection over.
;-)

0.99 Mohms ;-)

 

[rmc86uk]

:S would that matter ,
couldnt find out type as it was completely black

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with smoke damage/burned out

Well I wired a shower up once and the plumber was like, " you've only put a 2.5 in for the shower it wants 2 be at least 6mm". I then pointed out that it was just a power shower!

 

[glasgospark]

>999 its a mft1720

 

[glasgospark]

0.00
0.00
0.46
0.34
0.00

sorry reading i got where
>999
>999
0.67
0.57
0.00
so only the last circuit has failed which was lighting circuit
but i didnt test between lives i linked lives and tested to earth

 

[odawire]

1. shower had incorrect isolation switch
2. shower wired in 2.5mm cable
3. shower suppl not on its own circuit
4. earth not connected for circuit 3
5. no earth sleeving circuit 4
6. faulty switch on kitchen socket
7. every circuit apart from the cooker had failed the insulation resistance test

thus the test conclusion was unsatisfactory.


guy then asked so all i need is to retest in 10 year :S

he was positive he doesnt need to rectify

property was rented out and he was landlord

What protective device was protecting the shower?

 

[telectrix]

are you sure it's not a power shower? and those IR readings would lead me to believe that it's a single neutral fault affecting more than 1 circuit. did you dis. the neutrals from the N bar in the CU before testing?

 

[sparkymalarky]

sorry reading i got where
>999
>999
0.67
0.57
0.00
so only the last circuit has failed which was lighting circuit
but i didnt test between lives i linked lives and tested to earth

0.67MegOhms & 0.57MegOhms are also fails R.E insulation resistance tests.

 

[glasgospark]

0.67MegOhms & 0.57MegOhms are also fails R.E insulation resistance tests.

yeah realised that 1.00Mohms minimum circuits upto and including 500v

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What protective device was protecting the shower?

it was wired from the ring through switched fused spur with only the nuetral switching

 

[telectrix]

so if the shower is instantaneous, (7kW, 9kW), why has the 13A fuse in the FCU not died?

 

[Guest55]

so if the shower is instantaneous, (7kW, 9kW), why has the 13A fuse in the FCU not died?

probably because both feed & load lives were shoved in 1 terminal , bypassing spur fuse.
so ultimately shower is protected by ring main device , which at 32A , will happily deal with a 8ish kw shower.