I understand what u are saying about cabinets ect, but tray using swa I see different it could only as I see inadvertently become and earthed part due to insulation coming off the swa.
I primarily work in commercial industrial environments. I have only ever see tray earthed twice. Usually I thought belts and braces attitude. Gn8 also states something along the lines of this too.
Although I read the beama guide with interest.
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