Hypertherm Powermax65 Service Manual Rev.1 - Manual (Page 37)

Power SuPPly SetuP
powermax
65/85 Service Manual 2-5
Install a line-disconnect switch
Use a line-disconnect switch for each power supply so that the operator can turn off the incoming power quickly in an
emergency. Locate the switch so that it is easily accessible to the operator. Installation must be performed by a licensed
electrician according to national and local codes. The interrupt level of the switch must equal or exceed the continuous
rating of the fuses. In addition, the switch should:
• Isolate the electrical equipment and disconnect all live conductors from the incoming supply voltage when in the
OFF position.
• Have one OFF and one ON position that are clearly marked with O (OFF) and I (ON).
• Have an external operating handle that can be locked in the OFF position.
• Contain a power-operated mechanism that serves as an emergency stop.
• Have appropriate slow-blow fuses installed. See 2-6 Power connection for the Powermax65 or 2-8 Power
connection for the Powermax85 for recommended fuse sizes.
Requirements for grounding
To ensure personal safety, proper operation, and to reduce electromagnetic interference (EMI), the power supply must
be properly grounded.
• The power supply must be grounded through the power cord according to national and local electrical codes.
• Single-phase service must be of the 3-wire type with a green or green/yellow wire for the protective earth
ground and must comply with national and local requirements. Do not use a 2-wire service.
• Three-phase service must be of the 4-wire type with a green or green/yellow wire for protective earth ground
and must comply with national and local requirements.
• Refer to the separate Safety and Compliance Manual included with your system for more information on
grounding.