agbtester wrote:... the Primetest 250 tester, when you test a class 1 appliance with a long cord which records a fail due to the length of cord, what is the best way to complete the test?
The PT250 has a fixed earth continuity pass limit of 0.2Ω (unlike, say, the PT350, which is user defined), so if the lead is too long, it'll take your (0.1 + R)Ω over 0.2Ω, and display a fail.
Unfortunately, there's not really a way round this, other than to use a tester that's appropriate for the appliances you're testing.
Is it acceptable to revert to a class 2 test to initiate a insulation test ?
No, not at all.
A Class II IR test is performed in a different way to a Class I IR test (as you should have learnt when you underwent whatever training you had in order to be considered competent to undertake testing).