Miller Electric NT 450, NT 500 manual Electrical Service Guide, Placing Jumper Links

4-12. 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 branch circuit sized for the rated output and duty cycle of the welding power source.

50/60 Hertz Models
Input Voltage	230	380	400	440	460	575
Input Amperes At Rated Output	57	34	33	30	29	23
Max Recommended Standard Fuse Rating In Amperes 1
Time-Delay 2	70	40	40	35	35	25
Normal Operating 3	90	50	50	45	40	35
Min Input Conductor Size In AWG 4	6	8	8	10	10	10
Max Recommended Input Conductor Length In Feet (Meters)	145 (44)	256 (78)	284 (86)	226 (69)	243 (74)	380 (116)
Min Grounding Conductor Size In AWG 4	8	10	10	10	10	10
Reference: 2005 National Electrical Code (NEC)

1If 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” .

3“Normal Operating” (general purpose − no intentional delay) fuses are UL class “K5” (up to and including 60 amp), and UL class “H” ( 65 amp and above).

4Conductor data in this section specifies conductor size (excluding flexible cord or cable) between the panelboard and the equipment per NEC Table 310.16. 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.

4-13. Placing Jumper Links

Tools Needed:

3/8 in 3/8 in

1

! Disconnect and lockout/tag- out input power before installing or moving jumper links.

Check input voltage available at site.

1Jumper Link Label Check label.

2Jumper Links

Move jumper links to match input voltage.

Close access door, or go on to Section 4-14.

Connect L1(U)

GND/PE L2(V)

Conductor L3(W)

First.

GND/PE

Donot overtighten jumper linknuts.

3

Input

Contactor

2

230VOLTS	575VOLTS
460VOLTS
	S−174973−B

Ref. 800 103-A

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