Primary (Input) Electrical Connection; Recommended Sizes For Input Conductors And Line Fuses - ESAB Heliarc 252 Instruction Manual

SECTION 2
ELECTRIC SHOCK CAN KILL! Before
making electrical input connections to
the power source, "Machinery Lockout
Procedures" should be employed. If
the connections are to be made from
a line disconnect switch, place the
switch in the off position and padlock
it to prevent inadvertent tripping. If the
connection is made from a fuse box,
remove the corresponding fuses and
padlock the box cover. If it is not pos-
sible to use padlocks, attach a red tag
to the line disconnect switch (or fuse
box) warning others that the circuit is
being worked on.
The chassis must be connected to an
approved electrical ground. Failure
to do so may result in severe electri-
cal shock, causing severe burns or
death.

2.2 PRIMARY (INPUT) ELECTRICAL CONNECTION

This power source is a single-phase unit and must be connected to a single-
phase power supply. It is recommended that the unit be operated on a dedicated
circuit to prevent impairment of performance due to an overloaded circuit.
1. The primary power leads must be insulated copper conductors. Two
power leads and one ground wire are required. Either rubber covered
cable or conduit (flexible or solid) may be used. Table 2-1 provides
recommended input conductors and line fuse sizes.
2. Remove the top cover. Identify primary power input connections on the
power switch, chassis ground lug on the "A" frame, and primary input
terminal board. Refer to Figures 2-1 and 2-2.
Table 2-1. Recommended Sizes for Input
Input Requirements
Volts Amps.
230 100
400 57
460 50
575 40
230*** 130
* Sized per National Electric Code for 75°C rated conductors @ 30°C ambient.
Not more than three conductors in raceway or cable. Local codes should be
followed if they specify sizes other than those listed above.
** Wire per National Electric Code Table 310-16 using 90°C rated conductors
(e.g. THW-2, THWN, THHN).
*** Heliarc 352 only.
3. When using the provided strain relief, refer to Figure 2-1 for proper cable
strip lengths. It is important to follow the cable strip guide to ensure
that if the primary input cable is ever pulled from the strain relief, the
input conductors will be pulled from the ON/OFF power switch before
the ground lead is pulled from the ground lug. Once stripped, thread
the input and ground conductors through the large strain-relief in the
rear panel of the power source. Connect the ground wire to the termi-
nal lug located on the right rear A-frame leg inside the power source.
Connect the primary power leads to terminals L1 and L3 on the input
power switch. Secure the strain relief on the input cable.
4. Check all connections for proper tightness. Ensure all connections are
correct and well-insulated.
16
Conductors and Line Fuses
Input & Gnd.
Conductor*
CU/AWG
No.6**
No.6
No.6
No.8
No.4**
INSTALLATION
Time-Delay
Fuse Size
Amps.
150
70
70
60
200