On 07/12/2017 13:11, wrote:

Yes only the MCB was switched off. Rest of the CU was on

Yup, that only isolates the live. N is still connected to the neutral
bus bar and hence the supply neutral via the main switch. E would be
connected to the supply neutral either at the PME head end (and multiple
other places) or at the transformer if your supply was TN-S. (it will
also be connected to an independent earth in the case of TT or any
installation with main equipotential bonds to incoming metallic services).


--
Cheers,

John.

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