DCS C-24W - Manual (Page 7)

If installation of a properly grounded wall receptacle is
impossible at the time of installation, consult your local electri-
cal inspector for permission to connect a temporary adapter (with
polarized blades) which could be plugged into your present 2-
wire receptacle; however, this is not recommended. If this is
done, you must attach the lug and/or the green adapter wire
to the receptacle cover plate screw. Ground from it to a
grounded metal cold water pipe* (See Fig.10). Do not ground
to a gas supply pipe. You must permanently ground the adapter
before connecting the appliance to the power supply.
CAUTION:
Attaching the adapter ground wire to wall
receptacle cover screw does not ground the appli-
ance unless the cover screw is grounded through
house wiring.
If there is any doubt as to whether the wall
receptacle is properly grounded, the customer
should have it checked by a qualified electri-
cian.
* Cold water pipe must have metal continuity the electrical
ground and cannot be interrupted by plastic, rubber or
other electrically insulating connectors (including water
meter or pump) without adding a jumper wire at these con-
nections (See Fig.9).
TWO PRONG
RECEPTACLE
COVER
PLATE
GROUND WIRE
GROUND WIRE
GROUNDED WATER PIPE
THREE-PRONG
ADAPTER
THREE-PRONG PLUG
777fig13
ALTERNATE GROUNDING METHOD
6
ELECTRICAL - GROUNDING
FIG. 9
FIG. 10