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electrically
HOT
by
stray
current
may
shock,
possibly
fa
tally.
Do NOT GROUND
to
electrical
conduit,
orto
a
pipe
carrying
ANY
gas
or
flammable
liquid
such
as
oil
or
fuel.
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
equip
ment
will become
electrically
HOT-a
dangerous
condi
tion 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/off 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
contactor)
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
bums,
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.
F.
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,SAFETYAND
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
29CFR
1910,
obtainable
from the
of
Documents,
U.S. Government
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.
STANDARDS,
Superintendent
Printing
Office,
OM-296
Page
5
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