2391 question multiple choice IR help to break down Electrical Advice

2391 question multiple choice IR help to break down Discussion Thread2391 question multiple choice IR help to break down Electrical Advice

During the construction of an installation, insulation resistance tests have been carried out between live conductors and earth on the individual circuits and the L to E results are shown below. What is the expected value of insulation resistance L to E when the whole installation is tested?




can someone explain how to break down this question?

thanks

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