During this period, the cord should be moved about to detect intermittent connections. The maximum resistance should be 0.5 ohm, after allowing for the resistance of the protective earth conductor in the cord. For separate cords, the resistance should align with the values in Table A, after allowing for temperature rise and contact resistance. As discussed above, it is possible for equipment to be safe even if accessible conductive parts fails this test. In case of such failures, further investigation will be necessary to determine whether the requirements for protective earthing apply.
Metal work around the supply inlet is most likely to be earthed for protective purposes.
Where mains supply is distributed from one unit to other units, earth continuity should be checked through to each dependent unit. Insulation Tests Securely connect the live and the neutral pins of the plug together. During the test, all covers should be in place and closed. The resistance should not be less than 2 Megohms. In some instances, a lower value may apply, if the first equipment provides the mains supply to the other units.