Oven tripping Rcd

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puvisalu

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Location
Lititz
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Electrical Contractor
Hello ✊
Oven trips the Rcd when heating up. Does it twice then after that it will work fine. I’ve tested the circuit and it’s clear, I’ve disconnected the fan in the oven and it’s still tripped. Then I’ve took the element out and insulation resistant tested it and it’s testing fine, any other ideas what it could be?
 
puvisalu said:
Hello ✊
Oven trips the Rcd when heating up. Does it twice then after that it will work fine. I’ve tested the circuit and it’s clear, I’ve disconnected the fan in the oven and it’s still tripped. Then I’ve took the element out and insulation resistant tested it and it’s testing fine, any other ideas what it could be?
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It has been mentioned here before that new electric ranges will trip a GFCI when they first heat up. Moisture in the heating elements. Once that is gone, they should be good to go.
 
ptonsparky said:
It has been mentioned here before that new electric ranges will trip a GFCI when they first heat up. Moisture in the heating elements. Once that is gone, they should be good to go.
Click to expand...

The way I read the OP, this trips twice every time a cold start is initiated. Hopefully, he’ll clarify.
 
Maybe we should start addressing how much of this " Tek " does not work, then forget about how it evolved and start doing something about it.
Much of it is a colossal joke.
 
Little Bill said:
The OP is from Great Britain, they use RCDs there, which is a form of GFCI.
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I guess what I should have said was someone that uses the term RCD probably isn't from here. That, and the obscure small town in PA is confusing. I only say this because location may have a bearing on the equipment talked about and how it's supplied.


-Hal
 
ptonsparky said:
It has been mentioned here before that new electric ranges will trip a GFCI when they first heat up. Moisture in the heating elements. Once that is gone, they should be good to go.
Click to expand...
Yeah, I have had issues with electric ovens tripping the 50amp GFCI cb. I have also had issues with gas oven temperature regulators tripping AFCI cbs.
 
My guess is capacitve coupling of the elements to the frame.
I have dealt with this with sauna heaters and GFCI's.
 
tortuga said:
My guess is capacitve coupling of the elements to the frame.
I have dealt with this with sauna heaters and GFCI's.
Click to expand...

There is a specific equation describing this:

1616872058322.png


f= frequency. Any transients from switching or other sources can cause a relatively substantial current to ground tripping the GFCI.
 
tortuga said:
My guess is capacitve coupling of the elements to the frame.
Click to expand...

My guess is damp asbestos? insulation surrounding the nichrome heating element and the tubing it's run through. Tubing is grounded. This is why the problem goes away after getting the burners to heat up and drive the moisture out.

-Hal
 
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