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3-8. Connecting Input Power
4
2
3-9. Electrical Service Requirements For 500 Ampere Models*
Input Voltage
Input Amperes At Rated Output
Circuit Breaker Size In Amperes
1
Fuse Size In Amperes
Input Conductor Size In AWG/Kcmil
Maximum Input Conductor Length In Feet (Meters)
Grounding Conductor Size In AWG/Kcmil
*
These values are calculated from the 1996 edition of the National Electrical Code (NEC).
1 Standard fuse or circuit breaker size is that closest to 150% of rated input amperage of the welding power source (Article 630-12(a) of NEC).
2 Input conductor size is for insulated copper wire with 75
(Table 310-16 of NEC).
3 Maximum length is to prevent more than a 3% voltage drop between service entrance and input terminals of the welding power source (Articles
210-19(a) and 215-2(b) of NEC).
4 The grounding conductor shall be colored or identified as specified in the NEC. Grounding conductor size for copper wire is not required to be larger
than input conductor (Article 250-95 of NEC).
1
8
5
6
4
7
3
1
2
3
4
°
C rating with not more than three single current-carrying conductors in a cable or raceway
Tools Needed:
1/2, 11/16 in
230
460
106
150
150
2
155 (47)
261 (80)
6
Have only qualified persons make
this installation.
Open rear access door.
1
Line Disconnect Switch Of
Proper Rating
2
Strain Relief Connector
Obtain and install strain relief con-
nector.
3
Input Conductors
4
Grounding Conductor
Select size and length using Sec-
tion 3-9 or Section 3-10. Conductor
rating must comply with national,
state, and local electrical codes.
Use lugs of proper amperage ca-
pacity and correct hole size.
5
Input Terminal Board
6
Line Terminals
7
Ground Terminal
Insert conductors through strain
relief.
Connect input conductors to line
terminals and grounding conductor
to ground terminal.
Install and connect input conduc-
tors and grounding conductor in
conduit or equivalent to deener-
gized line disconnect device.
Be sure grounding conductor goes
to an earth ground.
Close rear access door.
8
Overcurrent Protection
Select type and size using Section
3-9 or Section 3-10. Install into
deenergized line disconnect device
(fused disconnect switch shown).
ssb2.4* 2/93 – ST-158 381
575
53
43
80
60
80
60
6
8
259 (79)
8
10
S-0092-E
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