A means for disconnecting the cutting system shall be provided according to the installation, safety,
and emergency requirements for the local codes and regulations, taking into account the input power
requirements. Hypertherm does not supply this means of disconnection.
Circuit breaker or fuse requirements
You must use a circuit breaker or fuse that is sufficient to support the plasma cutting system.
For main feed protection, choose a circuit breaker or fuse that is large enough to withstand all branch-feed
loads for both inrush and steady-state current. Refer to Table 7 on page 45 for the recommended time-
delay fuse sizes.
As an installer or user, you must choose time-delay fuses and circuit breakers that can withstand inrush
current that is up to 15 times the rated input current for 0.01 seconds and up to 10 times the rated input
current for 0.1 seconds.
The size requirements for breakers or fuses at your site can change because of the following:
■
Local line conditions (such as source and line impedance and voltage fluctuations)
■
Product inrush characteristics
■
Regulatory requirements
Always follow the national and local electrical safety requirements for your location, including requirements
for correct electrical system design and installation. Speak with a licensed electrician for more information
about the codes in your location.
If time-delay, high-inrush fuses are not permitted at your site because of
national or local codes, use a motor-start circuit breaker or equivalent.
Main power cord requirements
As an installer or user, you must supply the main power cord for your cutting system.
Refer to Table 7 on page 45 for recommended main power cord size.
The recommended main power cord sizes are based on Table 310.16 of the U.S. National Electric Code
(2023 Handbook). Table 7 on page 45 shows stranded-flexible cord rates for 90°C (194°F). The size
requirement for the main power cord at your site can change because of the following conditions:
■
Wires with lower temperature ratings
■
Wires with different insulation types
■
Different distances between the line-disconnect switch or receptacle and the plasma power supply
■
Local codes and regulations
Qualifications and Requirements
2
46
811530 Instruction Manual XPR460
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