insulation lump test

[Graham Coughlan]

Could someone please help me understand insulation lump test. I've had a look through gn3 but i cant find anything that says "insulation lump test" as such.

Am i missing it or is figure 2.3 on page 39 pretty much it?


My final 2394 test is today!!


Cheers

 

[Sharpend]

Sorry not familiar with term 'lump' test? Do you mean a global test?

 

[telectrix]

never heard of a lump test.

 

[scotsparky]

Well been at this game for 20+ years and never heard of it.
Unless you mean the combined test.
Gn3 method 2
Disconnect main Supply and neutral.
Test between all line conductors and earth.

Basic really

 

[Graham Coughlan]

The question ive got is: 19 - Four circuits have insulation resistances of 40MΩ, 50MΩ, 100MΩ and 100MΩ. When tested together (insulation lump test) what would be the expected reading:

 

[scotsparky]

thats not testing thats first year maths ... Parrallel resistances

Rt= 1/r1+ 1/R2+1/R3.........

 

[telectrix]

1/Rt mate

 

[scotsparky]

oops done from phone. Big homework hint though

 

[cobrauk]

Lumped togeather means To combine and treat them as a unit well it did when i went to school lol

 

[Amp David]

Have used the "dump test" before. Usually when the plumbers just installed the new throne!

 

[Guitarist]

The question ive got is: 19 - Four circuits have insulation resistances of 40MΩ, 50MΩ, 100MΩ and 100MΩ. When tested together (insulation lump test) what would be the expected reading:

Yet someone else set a basic homework question without covering it in class?

 

[shagbite]

Have used the "dump test" before. Usually when the plumbers just installed the new throne!

been on a couple of sites where the scruffy gits have left a massive turd in the toilet BEFORE it's been plumbed in.

 

[ipf]

been on a couple of sites where the scruffy gits have left a massive turd in the toilet BEFORE it's been plumbed in.

Not unusual for brickies on the lump, caught short? Oh ......not to be a plumber

 

[Andy78]

We're all supposed to do a lump test now and again. But I've heard it's best done after a hot bath, and I don't think water and voltage mix well. Not that I fancy sending 500V through the boys anyway !

 

[Sharpend]

Is that a confession? So how many boys do you have in your bath?