Drying Out Cooker Elements

Hi All

Just a quick (hopefully) question.

We all get the brand new elements that come from the suppliers with insulation faults – do you ever try baking the elements to try and recover them to try and get the moisture out or do you just have them replaced?

Personally I have never had success baking the moisture out but have a customer that has to have 6 elements replaced on their cooker due to insulation faults (I diagnosed it and then she bought the parts and asked me to fit them), 3 out of the 6 new ones trip the RCD within a couple of minutes of turning on so I removed them and refitted the old ones as they were marginally better and told her to get them returned/replaced.
The manufacturer has asked her to have them fitted and then disconnect the earth and the gas hose for an hour while running the oven at 285C before testing the insulation resistance again – is this really a viable long term repair or are they just trying to pull a fast one?

I know that doing this means that the cooker will not be safe to touch while doing this so for liability reasons allow I could not leave the property so was looking for other peoples thoughts before I go and waste a couple of hours doing this.

Jem