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Three-phase
connection. Check
phase
requirements
of
equipment
before
installing.
If
only 3-phase
power
is
available,
connect
single-phase equipment
to
only
two
wires of the
3-phase
line. Do NOT
connect
the
equip
ment
ground
lead
to
the third
(live)
wire,
or
the
equipment
will become
electrically
HOT-a
dangerous
condition that
can
shock,
possibly fatally.
Before
welding,
check
ground
for
continuity.
Be
sure
conductors
are
touching
bare
metal of
equipment
frames
at
connections.
If
a
line cord
with
a
ground
lead is
provided
with the
equipment
for connection
to
a
switchbox,
connect
the
ground
lead
to the
grounded
switchbox.
If
a
three-prong
plug
is added for connection
to
a
grounded mating
re
ceptacle,
the
ground
lead
must
be connected
to the
ground
prong
only.
If the line cord
comes
with
a
three-
prong
plug,
connect to
a
grounded mating receptacle.
Never
remove
the
ground
prong from
a
plug,
or use a
plug
with
a
broken off
ground
prong.
2.
Electrode Holders
Fully
insulated electrode
holders should be used. Do
NOT
use
holders with
protruding
screws.
3.
Connectors
Fully
insulated
lock-type
connectors
should be used
to
join welding
cable
lengths.
4.
Cables
Frequently inspect
cables for
wear,
cracks and
damage.
IMMEDIATELY REPLACE those
with
excessively
worn
or
damaged
insulation
to
avoid
possibly-lethal
shock
from bared cable. Cables with
damaged
areas
may be
taped
to
give
resistance
equivalent
to
original
cable.
Keep
cable
dry,
free of oil and
grease,
and
protected
from hot metal and
sparks.
5.
Terminals And Other
Exposed
Parts
Terminals and
other
exposed parts
of electrical units
should have
insulating
covers
secured before opera
tion.
6.
Electrode
a.
Equipment
with
output
on/oft control
(contactor)
Welding
power
sources
for
use
with the gas
metal
arc
welding (GMAW),
gas
tungsten
arc
welding (GTAW)
and similar processes
nor
mally
are
equipped
with devices that
permit
on
off control of the
welding
power
output.
When
so
equipped
the electrode wire
becomes
elec
trically
HOT
when the
power
source
switch is
ON and
the
welding
gun switch is closed. Never
touch the electrode
wire
or
any
conducting
ob
ject
in contact with the
electrode circuit unless
the
welding
power
source
is off.
b.
Equipment
without
output
on/off control
(no
contacto
r)
Welding
power
sources
used with shielded
metal
arc
welding (SMAW)
and
similar
proc
esses
may
not
be
equipped
with
welding
power
output
on-off control devices. With such
equip
ment
the electrode is
electrically
HOT when
the
power switch is turned ON. Never touch the
electrode
unless the
welding
power
source
is
of f.
7.
Safety
Devices
Safety
devices such
as
interlocks and circuit breakers
should
not
be disconnected
or
shunted
out.
Before
installation,
inspection,
or
service,
of
equipment,
shut OFF all power and
remove
line fuses
(or
lock
or
red-tag switches)
to
prevent
accidental
turning
ON
of
power.
Disconnect all cables from
welding
power
source,
and
pull
all 115 volts line-cord
plugs.
Do
not
open power
circuit
or
change polarity
while weld
ing.
If,
in
an
emergency, it
must
be
disconnected, guard
against
shock
burns,
or
flash from
switch
arcing.
Leaving equipment
unattended.
Always
shut OFF and
disconnect all power
to
equipment.
Power disconnect switch
must
be available
near
the
welding
power
source.
M.
Protection For Wearers of Electronic Life
Sup
port
Devices
(Pacemakers)
Magnetic
fields from
high
currents
can
affect
pacemaker
operation.
Persons
wearing
electronic
life
support
equipment (pacemaker)
should consult with their doctor
before
going
near arc
welding, gouging,
or
spot
welding
operations.
1-4.
STANDARDS BOOKLET
INDEX
For
more
information,
refer
to
the
following
standards
or
their latest revisions and
comply
as
applicable:
1.
ANSI Standard
Z49.1,
SAFETY
IN
WELDING
AND
CUTTING obtainable
from the
American
Welding
Society,
550 N.W. LeJeune
Rd,
Miami,
FL 33126.
2.
NIOSH,
SAFETY
AND HEALTH IN
ARC WELDING
AND
GAS WELDING
AND
CUTTING
obtainable
from the
Superintendent
of
Documents,
U.S. Gov
ernment
Printing
Office,
Washington,
D.C. 20402.
3.
OSHA,
SAFETY
AND
HEALTH
STANDARDS,
29CFR
1910,
obtainable from the
Superintendent
of
Documents, U.S. Government
Printing
Office,
Washington,
D.C. 20402.
4.
ANSI Standard
Z87.1,
SAFE PRACTICES FOR
OCCUPATION
AND
EDUCATIONAL EYE
AND
FACE PROTECTION obtainable from the Ameri
can
National Standards
Institute,
1430
Broadway,
New
York,
NY 10018.
5.
ANSI Standard
Z41.1,
STANDARD FOR MENS
SAFETY-TOE
FOOTWEAR obtainable from the
American
National
Standards
Institute,
1430
Broadway,
New
York,
NY 10018.
6.
ANSI Standard
Z49.2,
FIRE
PREVENTION
IN
THE
USE OF CUTTING AND WELDING PROCESSES
obtainable from
the American
National Standards
Institute, 1430
Broadway,
New
York,
NY 10018.
121988
Page
5
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