How to Test the Protective Bonding Conductor - Testing and Fault Finding Hints and Tips - AM2 & AM2S This video should help you understand why you must disconnect both end of the protective bonding conductor during your end point assessment AM2, AM2S or AM2E for apprentice electricians when doing the fault finding element of the assessment. Often at college you only have 2 short pieces of copper pipe to simulate the gas and water. In reality the water and gas pipes are connected together by othe