Output of an Auxiliary Relay Contact

in an electronics pcb we get 230v ac output which is supplied to common contact of a normally open contact of an auxiliary relay, which give 230v ac output when it energised. but at de-energised condition it shows 230v ac voltage (measured by a digital voltmeter) at its NO terminal though it unable to glow a 230v ac bulb. whereas at energised condition it shows 230v ac output too and bulb glows fully which is connected to relay output and a neutral point.

please help me to establish it's proper cause.

Hi Sovon,

Can't visualize clearly this case, however, for what I understand you are referring to the potential difference of this system, energized or not and why it is the same. So, the thing is that it has always a Potential Difference between the + or supply side and neural side or the device side to ground, connected or not.

Hope it helps.

God Bless.

Best,
Neil