high R1+R2 on radial lighting with emergencys

[jackhammer]

8 lamps and a switch

 

[Des 56]

Is this a Eicr or an initial verification ? its not clear to me which one you are carrying out


The insulation resistance test can be modified to suit which role you are involved with

If its initial, then the test should be before the transformers are fitted,if its a report,then L and N can be linked together and tested to earth

Why are you sure of the length the circuit should be compared to the actual length,how do you know the actual length ?
Who is the test for if its not your design ?

I don't understand what your role is to make any comment on the R1+R2

 

[sedgy34]

8 lamps and a switch

length of run of circuit??

 

[Richard Burns]

If you are measuring a cable of known length at 20 degrees C then the value should be 1.5ohms.
Once you have multiple junctions in the cable and the cable may take various routes and not be exactly 50m then you could easily get 1ohm difference; it is likely to comply with the max Zs requirements.

 

[Guitarist]

As Richard says, if the circuit complies with the Zs requirements, then don't stress too much about the extra ohm.

 

[jackhammer]

thank you everyone for your help and responses, i discovered there is a seperate feed to the emergencys as it was done with 2 core and the installer ran an extre line in, problem solved thank you.

 

[GLENNSPARK]

How are you doing your R1+R2? Are you not shorting your supply cable line and cpc then removing lamps anyway to test?

line AND cpc guitarist......so why remove lamps?...

 

[GLENNSPARK]

If you are measuring a cable of known length at 20 degrees C then the value should be 1.5ohms.
Once you have multiple junctions in the cable and the cable may take various routes and not be exactly 50m then you could easily get 1ohm difference; it is likely to comply with the max Zs requirements.

yes and this is why TDRs arnt really any good for fixed installs richard.....cables taking different routes....

 

[Guitarist]

line AND cpc guitarist......so why remove lamps?...

I use lightmates so used to taking the lamp out whenever possible. Should have said "...then testing at load end" . Apologies

 

[GLENNSPARK]

I use lightmates so used to taking the lamp out whenever possible. Should have said "...then testing at load end" . Apologies

i use lightmates as well guitarist...for R1 R2 and Zs....so if its open circuit at the lampholder on an R1 R2...if a BC type then just turn it through 180 degrees....if an ES..then its further investigation (3)...and will come back as wrong polarity on loop....so the same for Zs....

 

[GLENNSPARK]

i forgot to mention that this is good for EICR work...furthest point n all that.....for an initial verification however....

 

[KFH]

On new installs I often get high readings caused by switch resistance. Flicking the switch a few times usually produces an acceptable figure.

 

[GLENNSPARK]

crap on contacts....same with socket outlets....dirty shutters n all....