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5-2. Connecting 1-Phase Input Power (Continued)
!
Installation must meet all National and
Local Codes − have only qualified per-
sons make this installation.
!
Disconnect and lockout/tagout input
power before connecting input con-
ductors from unit. Follow established
procedures regarding the installation
and
removal
of
lockout/tagout
devices.
!
Always connect green or green/yellow
conductor to supply grounding termi-
nal first, and never to a line terminal.
5-3. Electrical Service Guide
Failure to follow these electrical service guide recommendations could create an electric shock or fire hazard. These recommenda-
tions are for a dedicated circuit sized for the rated output and duty cycle of the welding power source.
In dedicated circuit installations, the National Electrical Code (NEC) allows the receptacle or conductor rating to be less than the rating
of the circuit protection device. All components of the circuit must be physically compatible. See NEC articles 210.21, 630.11, and
630.12.
Input Voltage
Input Amperes At Rated Output
Max Recommended Standard Fuse or circuit breaker Rating In Amperes
Min Input Conductor Size In AWG
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG
Reference: 2014 National Electrical Code (NEC) (including article 630)
1 If a circuit breaker is used in place of a fuse, choose a circuit breaker with time-current curves comparable to the recommended fuse.
2 "Time-Delay" fuses are UL class "RK5" . See UL 248.
3 "Normal Operating" (general purpose - no intentional delay) fuses are UL class "K5" (up to and including 60 amps), and UL class "H" ( 65 amps and
above).
4 Conductor data in this section specifies conductor size (excluding flexible cord or cable) between the panelboard and the equipment per NEC Table
310.15(B)(16). If a flexible cord or cable is used, minimum conductor size may increase. See NEC Table 400.5(A) for flexible cord and cable
requirements.
5-4. Selecting Extension Cord (Use Shortest Cord Possible)
Single Phase AC
Input Voltage
240
*Conductor size is based on maximum 3% voltage drop
.
A complete Parts List is available on-line at www.MillerWelds.com
See rating label on unit and check input volt-
age available at site.
1
Input Power Cord
2
Disconnect Device (switch shown in the
OFF position)
3
Disconnect Device Grounding Terminal
4
Disconnect Device Line Terminals
5
Black And White Input Conductor (L1
And L2)
6
Green Or Green/Yellow Grounding
Conductor
Connect green or green/yellow grounding
conductor to disconnect device grounding
terminal first.
4
4
Connect input conductors L1 and L2 to dis-
connect device line terminals.
7
Over-Current Protection
Select type and size of over-current protec-
tion using Section 5-3 (fused disconnect
switch shown).
8
Plug (NEMA 6-50P)
9
Receptacle (NEMA 6-50R)
Connect plug to receptacle.
Close and secure door on disconnect device.
Follow established lockout/tagout proced-
ures to put unit in service.
1
2
Time-Delay
3
Normal Operating
Conductor Size − AWG (mm
12 (3.31)
Maximum Allowable Cord Length in ft (m)
120 (37)
input4 2012−05 − 803 766-C
Elec Serv 2014−01
60 Hz Single Phase
240 Volts AC
21
20
30
14
78 (24)
14
2
)*
14 (2.08)
78 (24)
OM-264761 Page 15
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