System Grounding - Shop fox W1867 Owner's Manual

Model W1867/W1868/W1869 (For Machines Mfd. Since 11/18)
System.Grounding
Since plastic hose is abundant, relatively
inexpensive, easily assembled and air tight, it is
a very popular material for conveying dust from
woodworking machines to the dust collector.
We recommend only using short lengths
of flexible hose (flex-hose) to connect the
woodworking machine to the dust collector.
However, plastic flex-hose and plastic duct are
an insulator, and dust particles moving against
the walls of the plastic duct create a static
electrical build up. This charge will build until it
discharges to a ground.
If a grounding medium is not available to
prevent static electrical build up, the electrical
charge will arc to the nearest grounded source.
This electrical discharge may cause an explosion
and subsequent fire inside the system.
To protect against static electrical build up
inside a non-conducting duct, a bare copper
wire should be placed inside the duct along
its length and grounded to the dust collector.
You must also confirm that the dust collector
is continuously grounded through the electrical
circuit to the electric service panel.
If you connect the dust collector to more
than one machine by way of a non-conducting
branching duct system and blast gates, the
system must still be grounded as mentioned
above. We recommend inserting a continuous
bare copper ground wire inside the entire duct
system and attaching the wire to each grounded
woodworking machine and dust collector.
Always.
static.
up. by. grounding. all. dust.
collection.lines.
guard. against.
electrical. build.
-35-
Be sure that you extend the bare copper wire
down all branches of the system. Do not forget
to connect the wires to each other with wire
nuts when two branches meet at a "Y" or "T"
connection.
Ensure that the entire system is grounded.
If using plastic blast gates to direct air flow,
the grounding wire must be jumped (see the
figure below) around the blast gate without
interruption to the grounding system.
Plastic Blast
Gate
Copper
Ground Wire
Figure.54. Ground jumper wire when using
plastic blast gates and metal duct.
We also recommend wrapping the outside
of all plastic ducts with bare copper wire to
ground the outside of the system against static
electrical build up. Wire connections at Y's and
T's should be made with wire nuts.
Attach the bare ground wire to each stationary
woodworking machine and attach to the dust
collector frame with a ground screw as shown
in the figure below. Ensure that each machine is
continuously grounded to the grounding terminal
in your electric service panel.
External
Ground Wire
Internal
Ground Wire
Flex-Hose
Figure.55. Flex-hose grounded to machine.
Metal Duct
Ground
Screw