Apr 15 2018 15:03
This is a classic example of why you shouldn't trust this sort of information source. From your link,
"HOW TO PAT TEST A KETTLE – STEP 4: INSULATION AT 500V DC
Make sure the EUT ( equipment under test) is switched on. This test is used to verify that adequate insulation exists between the mains supply pins and earth. During the insulation test a 500VDC voltage is applied between the earth pin and both the live and neutral pins of the appliance mains supply plug.
If the reading is less than 0.1 mOhms, then the test result is a PASS."
This is totally wrong. Get a copy of
AS/NZS 3760:2010 and look at 22.214.171.124 and table 2. What you are testing is a heating element and the insulation resistance test at 500V DC should yield a result higher than 0.01 Mega Ohms that is 10 000 Ohms. If it is lower then it is a fail. Yes the Switch must be in the on position when carrying out this test.