Help with insulation resistance testing on a lighting circuit

[soar]

Just done a IR test on a light circuit,i test from the C.C.U fluke 1653B,500v, L-E reading 3.17Mohm,is that reading ok?

 

[malcolmsanford]

It passes, why don't you think it is ok??

 

[soar]

It passes, why don't you think it is ok??

i forget there was a point in the loft and i did not remove the lamp

 

[Octopus]

One bulb is highly unlikely to give you a reading of 3.17 Mohms

 

[telectrix]

anything over 2Mohms is OK.

 

[soar]

One bulb is highly unlikely to give you a reading of 3.17 Mohms

so the value of 3.17Mohms plus the Ze 0.35, should be recorded in column *12, Zs

 

[Octopus]

so the value of 3.17Mohms plus the Ze 0.35, should be recorded in column *12, Zs

You've lost me now. Why would you combine the IR reading with the Ze?

 

[Electricalserv]

Zs = Ze + R1 + R2

 

[tony mc]

Lost as well ???

Where did the ZE reading come from ???

 

[Robert2254]

It seems you are confused here. the R1+R2 figure is combined with Ze to give Zs. The insulation resistance readings have their own columns.
The IR of 3.17 Megohms is more than enough to satisfy the current regs.

 

[Electricalserv]

As above....

Zs is calculated from the measured value of Ze + the measured value of R1+R2 at each circuit.

The value of R1+R2 is found when doing continuity of CPC at the extremity of each circuit. The highest value

 

[fixit4u]

Totally agree with robert2254 on this one seems some confusion going on !

 

[lady electric]

R1+R2 is the continuity of protective conductors between line and cpc

 

[Deleted member 9648]

so the value of 3.17Mohms plus the Ze 0.35, should be recorded in column *12, Zs

Dont take this the wrong way,I'm not having a go....but one of the fundamental requirements of testing is a basic understanding of the principles which you clearly dont have. Can I suggest you do some serious schooling before carrying out any more testing?....Or something is going to go horribly wrong and you may end up responsible.....Friendly advise intended,nothing else.

 

[soar]

You've lost me now. Why would you combine the IR reading with the Ze?

sorry my mistake it should be (R1 + R2)+Ze******continuity column *6

sorry again for the confusion,just learning