LSpark
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well ive no idea why he can't test it, there are severl tests for checking the earthing trough metalwork, and yes it's normal to earth trough conduit and trunking, if it's dont properly tho, it's not somthing I would be overly concerned or not, however it must be connected to earth at some point and it would be essential to check the cables at this point were correctly sized, refer the electrician to this if he comes back to you.
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