Earth current

[Streetwear87]

Hi Everyone!
We build a 3 phase electric grill at my company.The grill has 6 elements.The elements are connected in delta, but..
4 elements work with a thermostat and 2 element work with an energy regulator.
So thermostat 4 elements connected:
L1-L2
L1-L3
L1-L2
L1-L3
Energy regulator 2 elements connected:
L2-L3
L3-L2
Also we have 3 led.Every phase have 1 led.
Phase 1 has the all 6 mini fan.
My problem is,i found 1 ampere on earth.If only energy regulator works with the 2 elements,no current flow to earth.Immediately i turn on the thermostat(4 elements) 1 ampere current flow to earth.
There is a 4 pole RCD what does not trip in this situation neither.
Neutral connected only to led and to fans.
There is no cross connection and the insulation resistances are all fine.
RCD disconnection time is fine and test button as well works.
My question is, how possible there is 1 amp on earth?
Why RCD does not trip?
Why i do not get electric shock if i touch the exposed metal part of the grill?

Thanks!!

 

[Streetwear87]

Red in this case is neutral.I do not understand your question.So i share a picture.I clamped at both place(like on picture)
[automerge]1591102191[/automerge]
At first picture is 1 amp.at second more far from earth conductor is around 800 mA