3-9
SETUP
Operator Manual
GROUNDING REQUIREMENTS
To ensure personal safety, proper operation, and to reduce electromagnetic interference (EMI), the
Powermax900 must be properly grounded:
• The power supply must be properly grounded through the power cord according to your national or
local electrical codes. The power supply chassis is electrically conductive and can present a shock
hazard if it is not properly grounded through the line voltage disconnect box. Single-phase service
must be of the 3-wire type with a green or green/yellow wire for protective earth ground. It must
comply with local electrical requirements. Do not use a 2-wire service! Refer to
Grounding
, in the
Safety section. Three-phase service must be of the 4-wire type with a green/yellow wire for protec-
tive earth ground. It must comply with local electrical requirements.
• Refer to the
Standards Index,
in the Appendix section, for other electrical codes.
WORK CABLE AND CLAMP
The work clamp must be attached to the workpiece to perform plasma cutting. Ensure that the work
clamp and the workpiece make good metal-to-metal contact. Attach the work clamp as close as pos-
sible to the area being cut to reduce exposure to electric and magnetic fields (EMF). Do not attach the
work clamp to the portion of the workpiece to be cut away. See Fig. 3-10.
Figure 3-10 Proper Work Clamp Connection
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