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3. 240 VOLT SINGLE PHASE OPERATION
The motor supplied with your machine is a dual voltage,
120/240 volt motor. It is shipped ready-to-run for 120
volt operation. However, it can be converted for 240 volt
operation.
A qualified electrician should do the conversion, or the
machine can be taken to an Authorized Delta Service
Center. When completed, the machine must conform to the
National Electric Code and all local codes and ordinances.
The machine is converted by re-wiring the motor for 240
volts, installing a 240 volt plug on the power supply cord
and replacing the switch (if necessary) with one that is rated
for 240 volt operation.
Be sure the 240 volt plug is only used in an outlet having
the same configuration as the plug illustrated in Fig. C. No
adapter should be used with the 240 volt plug.
EXTENSION CORDS
Use proper extension cords. Make sure your extension cord is in good condition and is a 3-wire
extension cord which has a 3-prong grounding type plug and matching receptacle which will accept the machine's
plug. When using an extension cord, be sure to use one heavy enough to carry the current of the machine. An
undersized cord will cause a drop in line voltage, resulting in loss of power and overheating. Fig. D-1 or D-2, shows
the correct gauge to use depending on the cord length. If in doubt, use the next heavier gauge. The smaller the gauge
number, the heavier the cord.
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC MACHINES
Ampere
Total Length
Rating
Volts
of Cord in Feet
0-6
120
up to 25
0-6
120
25-50
0-6
120
50-100
0-6
120
100-150
6-10
120
up to 25
6-10
120
25-50
6-10
120
50-100
6-10
120
100-150
10-12
120
up to 25
10-12
120
25-50
10-12
120
50-100
10-12
120
100-150
12-16
120
up to 25
12-16
120
25-50
12-16
120
GREATER THAN 50 FEET NOT RECOMMENDED
Fig. D-1
FOREWORD
The Delta 20-950 drill press is a 20" drill press. This heavy-duty machine has a 1 HP, 120/240V induction motor, 5/8" capacity
chuck and key, cast iron table, rack and pinion elevation mechanism, and an external depth stop. The 20-950 has a tilting table
for angle drilling. Side edges and parallel slots are provided for fast workpiece clamping.
NOTICE: The photo on the manual cover illustrates the current production model. All other illustrations contained in the
manual are representative only and may not depict the actual labeling or accessories included. These are intended to illustrate
technique only.
Gauge of
Extension Cord
18 AWG
16 AWG
16 AWG
14 AWG
18 AWG
16 AWG
14 AWG
12 AWG
16 AWG
16 AWG
14 AWG
12 AWG
14 AWG
12 AWG
FUNCTIONAL DESCRIPTION
GROUNDED OUTLET BOX
CURRENT
CARRYING
PRONGS
GROUNDING BLADE
IS LONGEST OF THE 3 BLADES
In all cases, make certain that the
receptacle in question is properly grounded. If you
are not sure, have a qualified electrician check the
receptacle.
MINIMUM GAUGE EXTENSION CORD
RECOMMENDED SIZES FOR USE WITH STATIONARY ELECTRIC MACHINES
Ampere
Rating
Volts
0-6
240
0-6
240
0-6
240
0-6
240
6-10
240
6-10
240
6-10
240
6-10
240
10-12
240
10-12
240
10-12
240
10-12
240
12-16
240
12-16
240
12-16
240
6
Fig. C
Total Length
Gauge of
of Cord in Feet
Extension Cord
up to 50
18 AWG
50-100
16 AWG
100-200
16 AWG
200-300
14 AWG
up to 50
18 AWG
50-100
16 AWG
100-200
14 AWG
200-300
12 AWG
up to 50
16 AWG
50-100
16 AWG
100-200
14 AWG
200-300
12 AWG
up to 50
14 AWG
50-100
12 AWG
GREATER THAN 100 FEET NOT RECOMMENDED
Fig. D-2
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