Silicon Graphics Origin 300, User Manual

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36 007-4498-002
2: Installation Procedures
Power Receptacle Verification
Ensure that a qualified technician installs the correct power receptacles. The SGI Origin
300 system with NUMAlink module uses one or two single-phase power receptacles. For
North American sites, the single-phase receptacle is a 30-amp, 200- to 240-volt receptacle
that has two phase sockets and one ground socket. For international sites, the
single-phase receptacle is a 32-amp, 200-volt receptacle that has one phase socket, one
neutral socket, and one ground socket.
For North American sites, use the following procedure to ensure that a single-phase
power receptacle is properly wired:
1. Set the voltmeter to a high AC voltage range.
2. Check the voltage between socket X and socket Y (refer to Figure 2-1). The meter
should read between 200 and 240 Vac.
3. Check the voltage between socket X and the ground socket. The meter should read
approximately 120 Vac.
4. Check the voltage between socket Y and the ground socket. The meter should read
approximately 120 Vac.
5. Check the voltage between the ground socket and an earth-ground location. The
meter should read 0 Vac.
6. Change the voltmeter to a low-resistance setting.
7. Measure between the ground socket and an appropriate earth-ground location and
ensure that resistance is less than 1 ohm.
8. Repeat Steps 1 through 7 for any additional single-phase power receptacles.
Caution: If a voltage reading is incorrect or if the resistance that is measured in Step 7 is
more than 1 ohm, contact a site-approved electrician. Do not proceed with the
installation procedure.
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