L&N-E IR Test (and we still haven't fixed the stupid 20 characters)

[hightower]

Its a handy method for EICRs when you either cant disconnect everything, or are unsure of any loads that are connected without your knowledge.

But only when there's nothing connected that's going to allow a leakage through the earth?

 

[LankyWill]

Its more of a precaution, most installs have a bit of leakage anyway.

 

[static zap]

( Is it a reason to start splitting ring up ... or is that cheating )
Localise !
Never mind IT equipment plenty of naff IEC cables out there !
(IEC leads may test good at 120V for some reason ...)

 

[PEG]

There is an argument,for "cutting corners",there is also an argument,for including additional sections of an installation,within a test.
We could have that discussion for an eternity...

The actual required tests,are of the installation alone,and not any additional parts,accessible or not. If this is not possible or practical,obvious allowances and measures,are required,to obviate this.

All that is really important,is for all testing,to be relevant and fully understood.

 

[westward10]

( Is it a reason to start splitting ring up ... or is that cheating )
Localise !
Never mind IT equipment plenty of naff IEC cables out there !
(IEC leads may test good at 120V for some reason ...)

IT equipment should not give false readings unless they incorporate filters and this is rare. IEC leads should never give false readings. Testing an office last night nothing unplugged all circuits above 100 meg. Shaver socket is a new one on me and I think you need to ask if such things and IEC leads give false readings then they are faulty.

 

[Hardwired]

It's not a test i would carry out with anything plugged in, i would aldo disconnect lamps and Led lights and smoke alarms. It's the only way you'll ever be 100 confident in it results

 

[Pat H]

I wasn't able to examine the shaver TX it had been installed under a floor that had then been laminated. There was no FCU it had been tapped into the RFC.
Apparently the Unit has its own internal fuse but of course if that did blow you need to rip the floor up to replace.
Anyway upshot was low IR readings with it in circuit. Disconnected RFC from both sides of it and the rest of the ring read fine. Had to "assume" the TX has some sort of filtering to earth. Had been working fine for years and worked fine on new RCBO for that RFC and has done since.

 

[HandySparks]

I wasn't able to examine the shaver TX it had been installed under a floor that had then been laminated.

I'm having trouble visualizing this. How would you plug your shaver in?

 

[Pat H]

The shaver point on the wall was just passive. The feed to it is the SELV from the TX.
The advantage is the shaver point is small with nothing in it and no in separated mains is fed near it. They aren't very common.

 

[static zap]

IEC leads give false readings then they are faulty.

Agree with faulty , 1x cable reading 300M(500V-unplugged)
probably old ones .
( I was suprised ,thought moulded=Idiot proof ,dirt free )

 

[westward10]

The shaver point on the wall was just passive. The feed to it is the SELV from the TX.
The advantage is the shaver point is small with nothing in it and no in separated mains is fed near it. They aren't very common.

How do you know it provided an isolated supply.

 

[westward10]

It's not a test i would carry out with anything plugged in, i would aldo disconnect lamps and Led lights and smoke alarms. It's the only way you'll ever be 100 confident in it results

Pointless exercise unless you get odd readings.