correct way to test for a extraneous conductive part

[lucus]

Hi everyone

Can someone please clear up exactly how to test if something is a extraneous conductive part, is it using a insulation resistance tester? I have a installation where the incoming water is in plastic then copper throughout the installation. If someone could clear this up it would be great.

Many thanks

Lucus

 

[diditrain]

Isolate the installation, then using an insulation resistance tester, connect one lead to your main earth terminal and the other lead to the metallic parts in question. Test at 500v, if your reading is 23,000 ohms or more then the part in question is not considered to be an extraneous conductive part.
Guidance note 8 give a good explanation

 

[truckster]

Agree with diditrain^^^^