IR
- Thread starter sijaysee
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Existing circuits for additions, alterations or reports?
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I don't necessarily see the two as bed-fellows.
Are these existing circuits you're testing for additions, alterations or for reporting purposes or are they new installations carried out by yourself?
If existing, what's the condition of the wiring? It could be anything, poor insulation, connected items, even a faulty meter.
If existing, what's the condition of the wiring? It could be anything, poor insulation, connected items, even a faulty meter.
- Joined
- 11 Jan 2004
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- 45,897
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- Country
IR poor/continuity good.
They don't necessarily go together.
Sadly, this is absolutely normal for many installations.
The much misunderstood insulation resistance test is actually a measure of separation of conductors.
Suspect damp, dust and debris before you get thinking about damage or the mythical 'breakdown of insulation'. Direct shorts usually indicate damage, which can often be tracked down quite accurately using your continuity tester. Values in the region of 500,000 Ohms will involve a more laborious, systematic process of dismantling the circuit concerned.
The much misunderstood insulation resistance test is actually a measure of separation of conductors.
Suspect damp, dust and debris before you get thinking about damage or the mythical 'breakdown of insulation'. Direct shorts usually indicate damage, which can often be tracked down quite accurately using your continuity tester. Values in the region of 500,000 Ohms will involve a more laborious, systematic process of dismantling the circuit concerned.
Where/how are you doing the IR test? Are you sure that absoltely everything is disconnected & unplugged.
The mains input filter on a computer hangs between live, neutral and earth and will scrog your IR measurements - you'll stand a good chance of scrogging the PC too, if you're not careful!
The mains input filter on a computer hangs between live, neutral and earth and will scrog your IR measurements - you'll stand a good chance of scrogging the PC too, if you're not careful!
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