Residual Current Devise (RCD)

[salem]

0n 415 V TT earthed system, Can we use Residual Current Device (RCD) at load side.

I'm having a case where RCD is tripping when we supply from portable generator with unearthed neutral, but not tripping when we supply from a transformer with earthed neutral.

 

[itsmoked]

One of your loads may have a capacitive leak that results in an imbalance that would normally be split or resolved via the source's ground which is missing with your generator.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

The first step will be to ground the generator neutral. If it still trips, check the waveform of the generator output with a scope.
Otherwise as itsmoked suggests or other load related issues.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Mbrooke]

Question is, do you want to run your system as IT or TT?