Insulation resistance - strange readings

[Deleted member 26818]

Readings that climb as the button is held on are generally down to damp.

 

[Risteard]

Mhmm that video has his earth out of the earth bus bar on IR test.

Well spotted. The 17th Edition prohibited insulation resistance being tested this way.

 

[Risteard]

Mhmm that video has his earth out of the earth bus bar on IR test.

Well spotted. The 17th Edition prohibited insulation resistance being tested this way.

 

[Deleted member 26818]

Well spotted. The 17th Edition prohibited insulation resistance being tested this way.

Think you’ll have to back that statement up with a Reg. No.

 

[The Ghost]

surely readings climbing are the capacitive effect of wasting batteries on charging up a cable effectively no? And in lore, maybe damp being dried out?

 

[buzzlightyear]

you swear that I made that video of I/r testing ,risteard .

 

[The Ghost]

Check Regulation 612.3.1 It used to be done with the earth disconnected but there was a change and now it is required to have the earth connected to the bus bar. Can't remember the exact reasoning behind it.

 

[Risteard]

Aside from regs you want the earth connected for the "biggest bang" scenario.
P.S. check Regulation 612.3.1 It used to be done with the earth disconnected but there was a change and now it is required to have the earth connected to the bus bar. Can't remember the exact reasoning behind it.

Because there could be a fault to Earth that isn't to the cpc.

 

[Risteard]

you swear that I made that video of I/r testing ,risteard .

I never suggested that. I voted disagree because the information in the video is incorrect.

 

[Risteard]

Think you’ll have to back that statement up with a Reg. No.

Don't have Regs book on me until Monday. If you read the section about insulation resistance testing needless to say that's where the regulation is.

 

[Deleted member 26818]

Don't have Regs book on me until Monday. If you read the section about insulation resistance testing needless to say that's where the regulation is.

It’s as Vortigern says, 612.3.1.

 

[dksanders]

Any damp present?
Did you null the the leads before retesting?
Are there any poor connections, croc clips not making contact properly?

How do you null test leads for an insulation resistance test? Continuity sure, but IR? Neither my Robin nor Kewtech MFT have such a function.