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Glossary
of
Occupational
Safety and
Health Terms |
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IDLH:
Immediately
Dangerous
to
Life
and
Health
-
The
maximum
concentration
of
gas
(in
PPM)
from
which
a
worker
could
escape
within
30
minutes
without
experiencing
any
escape-impairing
or
irreversible
health
effects. |
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LEL/LFL:
Lower
Explosive
Limit/Lower
Flammable
Limit - The
minimum
concentration
at which a
gas will
explode. A
common unit
of
measurement
is a percent
of the LEL.
mA: Milliamp
- A unit of
electric
current
expressed in
amperes.
PEL:
Permissible
Exposure
Limit -
Level of gas
(in PPM) a
worker can
be exposed
to 8 hours a
day / 40
hours a week
for the rest
of their
life with no
long term
health
effects.
PPM:
Part Per
Million - A
common unit
of
measurement
for toxic
gases. This
term
literally
means one
part out of
one million
possible
parts.
TLV-STEL:
Short Term
Exposure
Limit - The
average
amount of
gas (in PPM)
a worker can
be exposed
to in a 15
minute
period with
no long term
health
effects.
This may
occur 4
times a
shift with
one hour
between 15
minute
exposures.
TLV-TWA:
Time
Weighted
Average -
The average
amount of
gas (in PPM)
a worker can
be exposed
to over a
certain time
period. This
time is
defined as 8
hours to
represent a
normal work
day.
TLV:
Threshold
Limit Value
- A term
used to
signify
limits in
gas
exposure.
TLV is used
as a prefix
for TWA and
STEL.
UEL/UFL:
Upper
Explosive
Limit/Upper
Flammable
Limit - The
maximum
concentration
at which a
gas will
explode.
VAC:
Volts
Alternating
Current - An
electric
current that
reverses
direction at
regular
intervals.
VDC:
Volts Direct
Current - An
electric
current of
constant
direction. |
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glossary
