Longevity FORCECUT 50D - Manual (Page 14)

ForceCut 40D and 50D plasma cutters
Page 13 of 30
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Identifying the Ground wire
Caution:
The machine may appear to operate with an incorrectly connected ground wire, but it
will not operate properly. Selecting the correct ground wire is important for proper machine
operation and personnel safety.
Ground wires on LONGEVITY® Welding machines are usually one of the following colors:
 The ground wire is a dark green with a yellow stripe. The wire may also be just SOLID
GREEN.
Clean the ends of the wires to more easily distinguish the colors. The best and safest way to
determine which wire is ground is to measure the resistance between the machine chassis and the
selected wire, using an ohmmeter. Another method is to check the continuity between the chassis
and the wire, using a continuity meter. If the selected wire is ground, the connection between the
chassis and the wire will cause the meter to illuminate. If, for any reason, you cannot visually
detect the ground wire or do not feel comfortable with your selection, ask an electrician for help.
Identifying the hot wires
For 220vac service, both the brown and blue wire are positive wires. As you may know,
220vac features two hot wires. If you are wiring to 220vac, your blue and brown wires are
both hot. The green with yellow or SOLID GREEN is the ground. Remember, any hot wire
can be attached to either hot leg on the plug.
Note: Hot Wires May also be WHITE and BLACK if a GREEN WIRE is one of the three
wires. Therefore, GREEN is ALWAYS GROUND.
NOTE: LONGEVITY® recommends a 30 AMP breaker on 220v, but you can operate on a
larger AMP breaker.
Finished Plug: