Collection System - Grizzly T33587 Owner's Manual

Collection System

Material Selection
You have many choices regarding dust collection
ducting, but flexible hose is the most common
for this size of machine. However, be aware that
there is a fire or explosion hazard if plastic duct
material is used for dust collection without being
grounded against static electrical charge build-up.
Flexible rubber hose, polyethylene, plastic flex-
hose and other flexible ribbed hose is gener-
ally used for short runs. There are many different
types of flex hose on the market today. These are
manufactured from materials such as polyethyl-
ene, PVC, cloth hose dipped in rubber and even
metal, including steel and aluminum.
If using flex-hose, you should choose one of the
many types that are designed specifically for
the movement of solid particles, i.e. dust, grains
and plastics. However, the cost of specifically
designed flexible duct can vary greatly. Grizzly
offers polyethylene and steel flex hose.
Always guard against
static electrical build up
by grounding all dust
collection lines.
Duct Grounding
Plastic flex-hose is an insulator, and dust particles
moving against the walls of the hose creates 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 near-
est 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 elec-
tric service panel.
-18-
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" connec-
tion.
Ensure that the entire system is grounded. If using
plastic blast gates to direct air flow, the grounding
wire must be jumped (Figure 12) around the blast
gate without interruption to the grounding system.
lastic last
o er
Ground Wire
Figure 12. Ground jumper wire when using
plastic blast gates or elbows 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
buildup. 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 13. Flex-hose grounded to machine.
Model T33587 (Mfd. Since 09/23)
Gate
etal uct
Ground
Screw