Insulation resistance test

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Hi Looked at an industrial unit today for testing theres a large open wharehouse unit with approx 60 fleurescents very high up.

Whats the way to test them without disconnecting all the lights.

dont get these very often thankfully.........

Thanks
OS
 
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depends on what type of flourescent if they are starter switch types then remove all the starters this will isolate Live from Neutral
 
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No, just an IR test..... and see what the result finds
 
As a Periodic Inspection you mean? Is it possible to connect L&N together and IR test to earth?
 
Thats what I would do - although you may get shocking readings due to the inductors - they are never great.
 
Lectrician said:
Thats what I would do - although you may get shocking readings due to the inductors - they are never great.
They are designed for HT so 500v won't break them down to earth.
 
Spark123 said:
As a Periodic Inspection you mean? Is it possible to connect L&N together and IR test to earth?

Yip thats what I was after, Question is would that test be ok and what readings am i likely to get. the fittings dont look as if they have been up long
 
Spark123 said:
As a Periodic Inspection you mean? Is it possible to connect L&N together and IR test to earth?
should do test between L+N also.
 
ricicle said:
tim west said:
should do test between L+N also.

Not required if it is impractical to remove loads.Just L+N to E is suffice.
you can isolate L+N by removing all the starter switches if that type.
 
How do you remove the starters ;)

The regs call for the insulation resistance for a 500vDC test to be above 0.5 Meg, however anthing less than 2 Meg should be investigated further. Do you have a copy of guidance note 3?
 

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