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Good evening

Was wondering when testing for.insulation resistance and there is vulnerable equipment in circuit but unable to disconnect, I understand that you combine the line and neutral conductors and test to earth. I am just wondering if it's ok and safe to do this at 500v as there is no potential difference between the two I assume. Guidance i have read said you can do this and reduce the test voltage to 250v but If 500v is safe why would you lower the test voltage

Look forward to an answer
And t.g.i friday

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