Hypertherm Powermax 65, Operator'S Manual

Page: 35 / 156

POWeR SUPPly SeTUP
powermax
65/85
Operator 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 “Power connection for the Powermax65”
on page 2-6 or “Power connection for the Powermax85” on page 2-8 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.