How does NEV affect electronic systems ? Systems are working fine even if we interchange Phase and neutral. After goggling, I am in impression that susceptibility to NEV is mainly due to electronic design issues (like PWM feedback of SMPS referenced to chassis) and designs after 2000 are almost immune to NEV. Similarly I could not find any authenticated info / standard on NEV limit. People use 0.1, 1%, 10V, e.t.c., but did not get on what technical criteria are they selected. Please share our thoughts.
The PE conductor (earth) is connected only to the metal enclosure of the device. Hence, there does not appear to be any influence to the device, regarding the potential of the PE conductor. A rise in the PE potential will, however, affect the safety of personnel.
Please, take care to distinguish the difference between signal ground potential and PE potential. It is a common practise in electronics to use the ground symbol as 0V reference potential. The device is actually NOT grounded at these points (unless, in some special cases) ! Heatsinks are in some cases connected to PE, but only if this is possible due to circuit topology. If heatsinks are live (which is a common feature) then they are floating and MUST be insulated from the metal enclosure.
I think, the possible affect of non-symmetrical mode of three-phase network on electronic systems shoulld be considered in the terms of currents not neutral's voltage displacement.
The possible affect of neutral's voltage displacement on power network can take place via non-uniform distribution of currents by phases and change of voltages by phases.
