Assignment help!

[Graham Coughlan]

I dont know if this is in the write place but forgive me if its not....

Ive got 2 questions im stuck on if anyone could help please.

1. An insulation resistance measurement taken at theorigin ofthe installation records a value of 1.95mohms. Explain your subsequent actions regarding this vaule of IR

2. In order to comply with BS7671 the instrument used to measure IR must me capable of delivering a current of 1mA. Explain the reason for the requirement.


Thanks

 

[Plonker 3]

You need a copy of GN 3 for the answer to the first question as I said in my previous post.

 

[Graham Coughlan]

A IR result of 1.95MΩ could mean that a latent defect exists. Therefore each circuit should be tested separatly as this will help to indentify whether one particular circuit in the installation has a lower IR value, which possbly indicates a latent defect that should be rectified or whether the low resistance represents the summation of individual circuit IR and as such may not be a cause for concern.

 

[Plonker 3]

Correct and question 2?

 

[Graham Coughlan]

Still looking for question 2.. is 612.3 even the right section?

 

[Ringo]

Close, keep reading...

 

[Plonker 3]

Use the index.

 

[Graham Coughlan]

it got something to do with leakage current under normal conditions of use?

 

[Plonker 3]

Maybe, what is the exact terminology you are looking at?

 

[Graham Coughlan]

All i can see is the output values and the acceptable vaules of an IR tester but nothing to say why these values are so other than leakage current durring normal conditions but thats referring to extraneous condictive parts

 

[Plonker 3]

Do you no think there may be a reason for that?

 

[Graham Coughlan]

Because the answer is to do with leakage currents?

 

[Plonker 3]

To extraneous conductive parts.