Class 1 appliance with no exposed metal work to connect test lead too

Legh Richardson:

If its a genuine class I appliance then there will be an exposed conductive part available such as, mentioned, a screw head

It may be poorly or wrongly labelled,

There are cases where class II items of equipment have metals bodies....

Legh

That's not necessarily true.


It may only be the motor that's connected in a Class I configuration, for example, either for EMC purposes, or because of static.


There's nothing to stop a manufacturer completely housing a Class I component in insulating material - and either classifying it as Class I, or Class II (if the insulating material meets Class II requirements per the product standard) as they see fit.


If the product is being manufactured in accordance with harmonized standards, there is usually a means of production-line testing the appliance, which would include a test point for the protective earthing circuit. But there's nothing to stop a manufacturer clipping a housing over the top of a tested assembly after the production line test, and I'm guessing that's possibly what might have happened in this instance.

Legh Richardson:

If its a genuine class I appliance then there will be an exposed conductive part available such as, mentioned, a screw head

It may be poorly or wrongly labelled,

There are cases where class II items of equipment have metals bodies....

Legh

That's not necessarily true.


It may only be the motor that's connected in a Class I configuration, for example, either for EMC purposes, or because of static.


There's nothing to stop a manufacturer completely housing a Class I component in insulating material - and either classifying it as Class I, or Class II (if the insulating material meets Class II requirements per the product standard) as they see fit.


If the product is being manufactured in accordance with harmonized standards, there is usually a means of production-line testing the appliance, which would include a test point for the protective earthing circuit. But there's nothing to stop a manufacturer clipping a housing over the top of a tested assembly after the production line test, and I'm guessing that's possibly what might have happened in this instance.