IBM eServer p Series Installation Manual

Also see for RS/6000 Enterprise Server M80: User guide User guide User guide Installation guide Service guide

__ 2. Some receptacles are enclosed in metal housings. On receptacles of this type,perform the following steps:a. Check for less than 1 volt from the receptacle case to any grounded metalstructure in the building, such as a raised-floor metal structure, water pipe,building steel, or similar structure.b. Check for less than 1 volt from receptacle ground pin to a grounded point inthe building.Note: If the receptacle case or faceplate is painted, be sure the probe tippenetrates the paint and makes good electrical contact with the metal.__ 3. Check the resistance from the ground pin of the receptacle to the receptaclecase. Check resistance from the ground pin to building ground. The readingshould be less than 1.0 ohm, which indicates the presence of a continuousgrounding conductor.__ 4. If any of the three checks made in substep 2 are not correct, ask the customer toremove the power from the branch circuit and make the wiring corrections; thencheck the receptacle again.Note: Do not use the digital multimeter to measure grounding resistance.__ 5. Check for infinite resistance between the phase pins. This is a check for a wiringshort.CAUTION:If the reading is other than infinity, do not proceed! Have the customermake necessary wiring corrections before continuing. Do not turn on thebranch circuit CB until all the above steps are satisfactorily completed.__ 6. Have the customer turn on the branch circuit CB. Measure for appropriatevoltages between phases. If no voltage is present on the receptacle case orgrounded pin, the receptacle is safe to touch.__ 7. With an appropriate meter, verify that the voltage at the outlet is correct.__ 8. Verify that the grounding impedance is correct by using the ECOS 1020, 1023,B7106, or an appropriately approved ground impedance tester.Note: Donot use the 120-volt convenience outlets inside a machine to powerthe tester.4 Installation Guide