Peter,
You asked:
>Question 1: Can we rely on the two screws securing the appliance inlet
as
>a means for bonding?
Not for 3-wire, Class I products! As you have said the safety agencies
don't like it. I expect this cannot be relied upun as these parts may be
replaced in the field if they are found to be faulty. The replacement may
be similar, but we cannot control that it will be an approved part if
replaced by the end user themselves and necessarily have adequate
grounding.
>Over the years, I have been told by various safety agencies that such
>construction is unacceptable.
>Question 2: Am I correct in assuming that the appliance earthing
>terminal for the above Listed/Certified products was considered as the
>main protective earthing terminal?
This is true for the 3-wire, Class I product.
>Question 3: Why do most other ITE manufacturers use the "stud on the
>chassis method" for protective earthing terminal?
To get past the agencies.
Cheers,
Colin.
