low voltage measured across any phase and neutral 3

[ekwaffo]

Hi,
I would like to know the possible causes of a low voltage measured across any phase and neutral. Voltage between phases however, remains normal. Causes please??????

Has something to do with the neutral but can not get my head around it.

 

[ekwaffo]

Wow!!
Thanks a lot guys. Soo much info to digest.
Some customers can very much confuse you.
Yea, customer is on a three phase supply