Electrical Connections; Grounding Instructions; Extension Cords - Jet JWBS-20 Operating Instructions And Parts Manual

Electrical Connections

Electrical connections must
be made by a qualified electrician in
compliance with all relevant codes. The
machine must be properly grounded to help
prevent electrical shock and possible fatal
injury.
The bandsaw is equipped with either a single
phase, 230 volt motor; or a three phase,
230/460 volt motor. The single phase unit is
factory wired for 230 volts and equipped with a
20 amp cord and plug set. The 230 volt plug
requires a receptacle similar to the one shown in
Figure 13. Use an outlet rated at least 20 amps.
The circuit for the machine should be a
dedicated circuit, and protected by at least a 20
amp circuit breaker or fuse.
Figure 13
The three phase motor is pre-wired for 230 volt
but is not equipped with a plug. It may be
reconnected for 460 volts by changing the
connections as illustrated in the diagram in the
motor wiring box. You may either install a
UL/CSA listed plug suitable for 460 volt
operation, or "hard-wire" the bandsaw directly to
a service panel.
If the bandsaw is to be hard-wired to a panel,
make sure a disconnect is available for the
operator. During hard-wiring of the machine,
make sure the fuses have been removed or the
breakers have been tripped in the circuit to
which the bandsaw will be connected. Place a
warning placard on the fuse holder or circuit
breaker to prevent it being turned on while the
machine is being wired.
Consult the electrical diagrams on pages 29-31
for further clarification of wiring.

Grounding Instructions

This machine must be grounded. In the event of
a malfunction or breakdown, grounding provides
a path of least resistance for electric current to
reduce the risk of electric shock.
Improper connection
grounding conductor can result in a risk of
electric shock. The conductor with insulation
having an outer surface that is green with or
without yellow stripes,
grounding conductor. If repair or replacement of
the electric cord or plug is necessary, do not
connect the equipment-grounding conductor to a
live terminal.
Check with a qualified electrician or service
personnel if the grounding instructions are not
completely understood, or if in doubt as to
whether the machine is properly grounded.
Repair or replace a damaged or worn cord
immediately.
Make sure the voltage of your power supply
matches the specifications on the motor plate of
the bandsaw.

Extension Cords

For circuits which are far away from the
electrical service box, the wire size must be
increased in order to deliver ample voltage to
the motor. An undersize cord will cause a drop
in line voltage resulting in loss of power and
overheating.
The chart in Figure 14 shows the recommended
size cord to use for branch circuits and
extension cords. The smaller the gauge number
the heavier the cord. If in doubt, use the next
heavier wire gauge.
Recommended Gauges (AWG) of Extension Cords
Extension Cord Length *
25 50
Amps
feet feet
< 5 16 16
5 to 8 16 16
8 to 12 14 14
12 to 15 12 12
15 to 20 10 10
21 to 30 10 NR
*based on limiting the line voltage drop to 5V at 150% of the
rated amperes.
NR: Not Recommended.
Figure 14
12
of the equipment-
is the equipment-
75 100 150 200
feet feet feet feet
16 14 12 12
14 12 10 NR
12 10 NR NR
10 10 NR NR
10 NR NR NR
NR NR NR NR