Longevity FORCECUT 50D - Manual (Page 15)

ForceCut 40D and 50D plasma cutters
Page 14 of 30
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Wiring Introduction for 110 Volt - 20amp Breaker
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 Neutral Wire
For 110vac service, the brown wire is is a hot wire. As you may know, 110vac features one
hot wire, a neutral wire, and a ground wire. If you are wiring to 110vac, your blue wire is
neutral, brown is hot and the green with yellow or SOLID GREEN is the ground.
Note: Hot Wires May also be WHITE and BLACK if a GREEN WIRE is one of the three
wires. Therefore, GREEN is ALWAYS GROUND. In this case one of the wires is neutral
and one is hot.
NOTE: LONGEVITY® recommends a 20 AMP breaker on 110v
110V Plug Diagram: