(1) You must make sure the path to ground
from circuits, equipment, and enclosures is permanent, continuous, and
effective.
(2) You must make sure
exposed noncurrent-carrying metal parts of cord- and plug-connected equipment
that may become energized are grounded under any of the following conditions:
(a) If operated at over 150 volts to ground,
except for guarded motors and metal frames of electrically heated appliances if
the appliance frames are permanently and effectively insulated from
ground.
(c)
If the equipment is of the following types:
(i) Hand-held motor-operated tools.
(ii) Stationary and fixed motor-operated
tools.
(iii) Light industrial
motor-operated tools.
(iv)
Refrigerators.
(v)
Freezers.
(vi) Air
conditioners.
(vii) Clothes washers
and dryers.
(viii)
Dishwashers.
(ix) Electrical
aquarium equipment.
(x) Sump
pumps.
(xi) Hedge
clippers.
(xii) Electric lawn
mowers.
(xiii) Electric snow
blowers.
(xiv) Wet
scrubbers.
(xv) Tools likely to be
used in damp or wet locations.
(xvi) Appliances used by employees standing
on the ground, on metal floors or working inside of metal tanks or
boilers.
(xvii) Portable hand
lamps.
(xviii) Portable and mobile
X-ray and associated equipment.
(xix) Tools likely to be used in wet and
conductive locations.
|
Note:
|
Grounding can be achieved by using tools
and appliances equipped with an equipment grounding conductor (three-prong plug
and grounded electrical system). |
Click here to view
image
(3) You must make sure exposed metal parts of
fixed equipment that do not conduct electricity, but may become energized, are
grounded under any of the following conditions:
(a) If the equipment is in a wet or damp
location and is not isolated.
(b)
If within 8 feet vertically or 5 feet horizontally of ground or grounded metal
objects and subject to employee contact.
(c) If in electrical contact with
metal.
(d) If in a hazardous
(classified) location.
(e) If
supplied by a metal-clad, metal-sheathed, or grounded metal raceway wiring
method.
(f) If equipment operates
with any terminal at over 150 volts to ground.
(4) You must make sure a conductor used as a
grounded conductor is identifiable and distinguishable from all other
conductors.
(5) You must make sure
a conductor used as an equipment grounding conductor is identifiable and
distinguishable from all other conductors.
(6) You must make sure grounded conductors
are not attached to any terminal or lead so as to reverse polarity of the
electrical outlet or receptacle. See illustration - Examples of
wiring.
(7) You must make sure
grounding terminals or grounding-type devices on receptacles, cords,
connectors, or attachments plugs are not used for purposes other than
grounding.
Examples of Wiring
Click here to view
image
Click here to view
image
INCORRECT WIRING
