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2.4 FRAME GROUND CONNECTION
2.4
FRAME GROUND CONNECTION
IMPORTANT!!!
Connect the frame of the main unit to the ground.
1.
Loosen the screw.
2.
Insert the grounding wire.
3.
Tighten the screw.
4.
Connect the grounding wire to the ground.
In most of the continental United States, the ground provided by the "Third wire ground" at the
commercial power outlet will be satisfactory. However, in a small percentage this ground may
be installed incorrectly. Therefore, the following test procedure should be performed.
Test Procedure
1.
Obtain a suitable voltmeter and set it for a possible reading of up to 250 V AC.
2.
Connect the meter probes between the 2 main AC voltage points on the wall outlet. The
reading obtained should be 108 V AC-132 V AC.
3.
Move one of the meter probes to the third prong terminal (GND).
Either the same reading or a reading of 0 V should be obtained.
4.
If a reading of 0 V at 1 terminal and a reading of 108 V AC-132 V AC at the other terminal
is not obtained, the outlet is not properly grounded. This condition should be corrected by
a qualified electrician (per article 250 of the National Electrical Code).
5.
If a reading of 0 V at 1 terminal and a reading of 108 V AC-132 V AC at the other terminal
is obtained, then set the meter to the "OHMS/RX1" scale, place 1 probe at the GND
Terminal and the other probe at the terminal which gave a reading of 0 V. A reading of
less than 1
adequately grounded. See a qualified electrician.
48
Installation Manual
should be obtained. If the reading is not obtained, the outlet is not
To ground
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