Insulation Resistance Testing

[Gassan]

Should I remove all the loads when testing between live and neutral?

 

[Andy5678]

Yes disconnect all loads

 

[radiohead]

Depends if there is a need to test L-N. If you are testing new work then a full test between live conductors and lives to earth should be carried out. If it's an EICR or a test on an existing circuit where you are not entirely sure of the layout then a LN-E test is the only practical way, in which case there is no reason to disconnect loads. Try disconnecting 20 downlights before carrying out a L-N test......I don't think so.

 

[westward10]

Is this for works in the UK or the Maldives.

 

[Risteard]

If you are testing new work then a full test between live conductors and lives to earth should be carried out.

Depends. Many countries only require a Live/Earth insulation test rather than a Live/Live one. Generally it's the insulation resistance to Earth which we are trying to ascertain for the installation, although obviously in some places it's between all conductors.

 

[Gassan]

Is this for works in the UK or the Maldives.

It's for the Maldives. We follow UK rules. Some exceptions are there but mostly we are similar to the UK.

 

[westward10]

If you need to test between line and neutral then yes connected loads need removing/isolating. If you are carrying out some kind of periodic inspection then generally a line to neutral test isn't really necessary.

 

[littlespark]

Doing the L-N test with an approved calibrated tester with any load will do one of two things....

1. give you false readings, as the tester is measuring resistances etc through the equipment.

2. severely damage the connected equipment.

 

[radiohead]

If there is a desire to test an existing circuit L-N always do a 'soft' 250v test initially. That way you wont fry the clients £2000 PC which you didn't realize was on that circuit.

 

[Risteard]

That way you wont fry the clients £2000 PC which you didn't realize was on that circuit.

What about if the client has annoyed you?

 

[static zap]

That way you wont fry the clients £2000 PC

What about if the client has annoyed you?

Let him install Ionisers to improve air quality,
(Pretty weird effects on dry plastic surfaces)