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wattsup

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Problem with RCD on transfer
Help, advice or maybe the problem is, please!
I have a prob with one RCD tripping when on generator supply
When on utility supply all ok.
Basically I have two rcd’s protecting an auto transfer switch control.
One rcd protects when in mains utility supply mode, the other protects when in generator supply.
The transfer works fine, if I mimic a power failure, the generator cuts in, the contactors switch to generator supply, all ok.
When I restore mains power, the contactors revert back and cut out the generator.
Except that when in generator mode, the rcd for the said supply trips.
There is no fault in circuit, tested ok. If I bypass the generator rcd all works fine, but I would rather have the rcd online, if I can fathom why it’s tripping.

 
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