Siemens TC12 Installation, Commissioning And Maintenance Handbook page 55

Cabinet Side Cover stud left hand side
Cabinet Side Cover stud right hand side
Cabinet Top Cover
Cabinet rear door
Metal Part of front door along hinged side
SIP Panel
IMD Panel
Master Switch Panel at the rear of the cabinet
Master Switch panel cover (aluminium plate behind the master switch panel).
Mains socket panel at the front of the cabinet
Any installed 19" racks - both left and right mounting flanges should be checked
PC Mounting metalwork
Case of power supply on every PSU Board Installed.
Volt rail on the PSU PCB of every TC12 rack installed in the cabinet The 0 Volt rail
is accessible at terminal pin TP7 on the PSU PCB, see Figure 7 for position of this
terminal pin on the PCB.
All earthed points on any other equipment which may have been included in the
cabinet.
If after the on site earth continuity test, any rack or panel is removed or replaced,
then the earth continuity check to that item should be repeated.
2.3.1.7 Insulation Resistance Test Procedure
Personnel should take care that they do not come into contact with the high
Set the insulation meter to 1000 V DC.
Make Sure that the Instation is not connected to the mains, but that all fuses are in
place, all switches are on (i.e. master Switch and Switches for front and rear mains
socket panels) and that all PCBs etc. are in place.
Connect the LIVE and NEUTRAL of the Instation mains wire together.
Connect the meter to measure between the Instation mains wire EARTH and the
combined LIVE and NEUTRAL.
Allow the meter reading to settle during the test.
The insulation resistance should be not less than 10 MOhm.
Note Once the Instation has passed the Insulation resistance test it should not
be repeated unnecessarily as the mains filters may be damaged.
WARNING Mains filters may remain charged for some time after the insulation
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TC12 Installation, Commissioning & Maintenance Handbook
voltages generated by the Test Instrument.
tests have been completed.
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SAFETY NOTE
Issue 10