4 MN903
Electrical Instructions
Single phase grinders are rated dual voltage. Some single phase grinders are equipped with
cord and grounding type plug for 115 volts. To use with a different voltage, see instructions
provided to make wiring changes. All attachment plugs and any receptacles must be replaced
with devices rated for the voltage for which the grinder is reconnected. Table 1 indicates the
minimum wire size. Be sure to comply with NEC and local wiring codes.
Three phase grinders are normally dual voltage and must be wired for the proper voltage and
rotation direction (connections are inside conduit box). Connect phase sequence so that the
wheel moves down toward top surface of tool rest as viewed from front of grinder. Wheel
must rotate toward tool rest. Be sure all electrical connections are secured and properly
insulated. For your safety, be certain grinder is properly grounded.
Grounding Instructions
WARNING: Be sure the system is properly grounded before applying power. Do not apply power
before you ensure that grounds are connected. Electrical shock can cause serious or fatal
injury. Follow the National Electrical Code (NEC) and local codes for the safe installation
of this equipment.
1. All grounded, cord–connected grinders:
In the event of a malfunction or breakdown, grounding provides a path of least
resistance for electric current to reduce the risk of electric shock. This grinder is
equipped with an electric cord having an equipment–grounding conductor and a
grounding plug. The plug must be plugged into a matching outlet that is properly
installed and grounded in accordance with all local codes and ordinances. Do not
modify the plug provided. If it will not fit the outlet, have the proper outlet installed by a
qualified electrician.
Improper connection of the equipment–grounding conductor can result in a risk of
electric shock. The “Green” insulated wire (with or without yellow stripes) is the
equipment–grounding conductor. If repair or replacement of the electric cord is
necessary, do not connect the equipment–grounding conductor to a live terminal. Check
with a qualified electrician or serviceman if the grounding instructions are not completely
understood, or if in doubt as to whether the tool is properly grounded.
Use only 3–wire extension cords that have 3–prong grounding plugs and 3–pole
receptacles that accept the tool’s plug.
Repair or replace damaged or worn cord immediately.
2. Grounded, cord–connected grinders intended for use on a supply circuit having a
nominal rating less than 150 volts:
This grinder is intended for use on a circuit that has an outlet that looks like the one
illustrated n Figure A. The tool has a grounding plug that looks like the plug illustrated in
Figure A. A temporary adapter, which looks like the adapter illustrated in Figures B and
C, may be used (except in Canada) to connect this plug to a 2–pole receptacle as shown
in Figure B if a properly grounded outlet is not available. The temporary adapter should
be used only until a properly grounded outlet can be installed by a qualified electrician.
The green–colored rigid ear, lug, etc. extending from the adapter must be connected to a
permanent ground such as a properly grounded outlet box.
3. Grounded, cord–connected tools intended for use on a supply circuit having a nominal
rating between 150–250 volts, inclusive:
This grinder is intended for use on a circuit that has an outlet that looks like the one
illustrated in Figure D. The grinder has a grounding plug that looks like the plug
illustrated in Figure D. Make sure the grinder is connected to an outlet having the same
configuration as the plug. No adapter is available, or should be used, with this grinder. If
the grinder must be reconnected for use on a different type of electric outlet, the
reconnection should be made by qualified service personnel; and after reconnection, the
grinder should comply with all local codes and ordinances.