Hypertherm HPR260 Manual Gas Preventive Maintenance Program Rev.5 - Manual (Page 85)

INSTALLATION
3-36 HPR260 Auto Gas Instruction Manual
5
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 national or
local 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 “O” (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).
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, which can last up to 0.20 seconds or 10 line cycles.
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: Cable AWG recommendations taken from table 310-16 of the National Electric Code handbook (USA).
F U S E
Input voltage Phase
Rated input
current
@ 45.5 kW output
Recommended
slow-blow fuse
size
Recommended Cable size for 15 m (50
ft) maximum length
Rated for 60°C Rated for 90°C
200/208 VAC 3 149/144 amps 175 amps N/A 67.5 mm 2 (2/0 AWG)
220 VAC 3 136 amps 175 amps N/A 67.5 mm 2 (2/0 AWG)
240 VAC 3 124 amps 150 amps 107.2 mm 2 (4/0 AWG) 53.5 mm 2 (1/0 AWG)
380 VAC 3 79 amps 95 amps 42.4 mm 2 (1 AWG) 26.7 mm 2 (3 AWG)
400 VAC 3 75 amps 90 amps 42.4 mm 2 (1 AWG) 26.7 mm 2 (3 AWG)
440 VAC 3 68 amps 80 amps 42.4 mm 2 (1 AWG) 21.2 mm 2 (4 AWG)
480 VAC 3 62 amps 75 amps 33.6 mm 2 (2 AWG) 21.2 mm 2 (4 AWG)
600 VAC 3 50 amps 60 amps 26.7 mm 2 (3 AWG) 13.3 mm 2 (6 AWG)