HELP !! with Insulation resistance test on ring and lighting circuit

[telectrix]

if L&N are linked, you can test to E at 500v

 

[Bradzz]

Soar it would be beneficial to you to purchase these booksAlso Guidance notes 3

 

[soar]

Soar it would be beneficial to you to purchase these booksView attachment 6213View attachment 6214Also Guidance notes 3

i hve gn3

 

[Bradzz]

i hve gn3

mines an old Gn3 check out page 37 IR Test 2
I think you are sure of what to do, just need more confidents.

 

[soar]

for the continunity of cpc (lighting) the furthest point,and do the test,but if you have two way at the stair,one switct up and one down,does that count as the furthiest point?

 

[malcolmsanford]

Have a read of reg 612.3.2 all will be revealed for the IR test.

The Continuity of CPC was answered on your other thread.

 

[Deleted member 26818]

for the continunity of cpc (lighting) the furthest point,and do the test,but if you have two way at the stair,one switct up and one down,does that count as the furthiest point?

With lighting circuits, in fact with any radial, it is not always apparent which is the furthest point.
As such an R1 + R2, or Zs test at each point will determine this. Doing such will also determine correct polarity of switches.
Any switches that do not affect the readings will show reversed polarity.

 

[telectrix]

i would identify the furthes point by the fact that there was only a feed in & switch wire . ( assuming loop-in at fitting scenario)

 

[Deleted member 26818]

i would identify the furthes point by the fact that there was only a feed in & switch wire . ( assuming loop-in at fitting scenario)

Not always possible, if for instance a spider configuration is used, or with spurs.
Also where there is two way switching, or even two way and intermediate switching some lights whislt physicaly closer to the CU, may in fact have higher R1 + R2/Zs values than fittings further away.

 

[telectrix]

agreed if spider or spurs, but in a standard loop in lighting radial ( talking mainly domestic ) the furthest point will be the one without a feed going out from the fitting, irrespective of how physically close to the CU it is.

 

[rmc86uk]

Aren't you suppose to test at every point on the circuit and then record the highest value?

Sent from my HTC Desire using Tapatalk

 

[Deleted member 26818]

Depends on limitations etc.

 

[Farmelectrics]

it is also known as test method 2 here as well join ln together to earth and ir at 250v first and then at 500v nothing wrong with this test method

 

[soar]

Not always possible, if for instance a spider configuration is used, or with spurs.
Also where there is two way switching, or even two way and intermediate switching some lights whislt physicaly closer to the CU, may in fact have higher R1 + R2/Zs values than fittings further away.

Good point, because that is the answer i was waiting for, i have a two way switch and the reading is highter than the furthest point,