E-mark testing is the quality check process that used to very the quality of products. Products that pass the test get an E-mark certification.
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explain why all the load must be removed when to conduct the insulation and resistance testing
Portable appliance testing (PAT) is basically a method of testing (using a device and by sight) that any electrical equipment, cables, devices, machinery is safe to use.
One way of "Earth fault testing" is to use a High Pot device. This send a high voltage with a very low current through the equipment and will tell you when there is a leak to ground.
This depends on the IC. Visual inspection will only go so far. You will need to test it and compare the testing to the datasheet; if it is not testing as specified in the datasheet, then it is bad. Sorry, there's no one easy answer for all IC's.
The different testing steps of HT and LT panel include commissioning, sanctioning, erection and the CPP set. All this is done in the servicing of the transformers and the HT/LT control panels.