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High Capacity Power Supply
Figure 1-1 High Capacity Power Supply, Models 913 (left) and 923 (right)
1-2
Before using the grounding adaptor as
illustrated, make certain that the center screw in
the outlet plate is actually grounded. This may be
done by testing for voltage between the hot side
of the outlet (narrower blade) and the outlet plate
screw. Do not use the adaptor if the outlet box is
not grounded.
Use a volt meter or neon test lamp to test for grounding. Make
sure the screw is still grounded after the adaptor is installed.
Some outlet plates have very short screws and some even use
plastic screws. While modern conduit systems are usually
properly grounded, older two-wire systems may only be grounded
at the main switch, and deterioration over time can make
grounding of thin wall conduit unreliable. This is particularly
true where moisture, heat, vibration, or chemical agents in the
air may weaken the junctions between the conduit fittings and
thin wall conduit. There may be no bare copper drain wire inside
the conduit. (Not all codes require the drain wire.) The adaptor
must not be used if this is the case. Have an electrician install a
proper grounding outlet or run a ground wire to the nearest cold
water pipe.
Model 923 – The Model 923 High Capacity Power Supply is
intended for use on a 240 VAC, 60 Hz circuit.
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