Hypertherm HD4070 Rev.1 - Manual (Page 66)

INSTALLATION
3-14 HyPerformance HD4070 Instruction Manual
1
Line disconnect switch
The line disconnect switch serves as the supply-voltage disconnecting (isolating) device.
Install this switch near the power supply for easy access by the operator.
Installation must be performed by a licensed electrician and according to applicable local or
national codes.
The switch should:
• isolate the electrical equipment and disconnect all live conductors from the supply
voltage when in the “OFF” position
• have one “OFF” and one “ON” position clearly marked with “0” (OFF) and “l” (ON)
• have an external operating handle capable of being locked in the “OFF" position
• contain a power operated mechanism that serves as an emergency stop
• have slow-blow fuses installed for the proper breaking capacity (see table above)
Input Rated input current Recommended Cable size
voltage Phase @ 40 kW output slow-burn fuse size (AWG)
200 VAC 3 125 amps 150 amps (*See note below)
220 VAC 3 113 amps 150 amps 2 AWG
240 VAC 3 103 amps 125 amps 4 AWG
400 VAC 3 62 amps 80 amps 6 AWG
440 VAC 3 56 amps 70 amps 6 AWG
480 VAC 3 52 amps 70 amps 6 AWG
600 VAC 3 41 amps 50 amps 8 AWG
Power requirements
General
All switches, slow-blow fuses and power cables are customer supplied and must be chosen as outlined by
applicable national or local electrical codes. Installation must be performed by a licensed electrician. Use a
separate primary line disconnect switch for the power supply.
Note: The main feed protection device (Circuit Breaker or Fuse) must be sized to handle all
branch feed loads for both inrush and steady state current. The power supply must be
wired into one of the branch feed circuits. The power supply has a steady state current
listed in the table below and has an inrush current of 10 times the rated input current that
can last up to 0.20 seconds or 10 line cycles.
7
Power cable
Wire sizes vary based on the distance of the receptacle from the main box. The wire sizes listed in the table above
were taken from the National Electric Code 1990 handbook, table 310.16 (USA). Use a 4-conductor Type SO input
power cable with a conductor temperature rating of 60°C (140°F). Installation must be performed by a licensed
electrician.
SWITCH BOX
* Note: Use 2 AWG wire rated for 90° C (194° F) rather than an equivalent larger diameter cable (1AWG) rated
for 60° C (140° F)