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Power Supply and Wiring
Section 6
(continued)
Conduit, Wire and Fuse Sizing
The use of metal conduit with metal conduit connectors is recommended for all electrical connections. Use the
NEC or CEC to determine the required conduit size for the application.
Refer to the chart below for the minimum allowable wire size for each controller. Note that these wire sizes
are not adjusted for voltage drop due to long cable lengths. Refer to the wire sizing chart in the appendix to
determine the maximum length for the input cable. Refer to the motor manual for maximum output cable
length. The maximum recommended voltage drop on both input and output cable combined is 5%. Standard
wire sizing charts give maximum cable lengths for only input or output cables. Because of this the lengths
given in the table must be adjusted so the total voltage drop does not exceed 5%. For example, if the input
wire sizing chart in the appendix gives the maximum length of 400' and only 100' is used then only 25% of the
total voltage drop (1.25% drop) is used. The maximum output cable length read from the motor's wire sizing
chart must then be adjusted to 75% of its value so that the maximum voltage drop of 5% is not exceeded.
Use only fast acting class T fuses. The wire used for the input power connections on models SPD20300 and
SPD20300F must have a temperature rating of 90ºC minimum. All other wire must be rated 75 ºC minimum.
The chart below shows the recommended sizes for wire and fuses for each controller. Note that the wire sizes
were not adjusted for voltage drop due to long cable lengths.
Maximum Ambient Temperature ➞
Voltage Frame
Model
Full Load
Size
Number Output Current
SPD20050
1
SPD20050F
SPD20075
SPD20075F
2
SPD20100
SPD20100F
SPD20150
230
SPD20150F
3
SPD20200
SPD20200F
SPD20250
SPD20250F
4
SPD20300
SPD20300F
SPD40050
SPD40050F
1
SPD40075
SPD40075F
SPD40100
SPD40100F
SPD40150
460
2
SPD40150F
SPD40200
SPD40200F
SPD40250
SPD40250F
3
SPD40300
SPD40300F
* 90ºC Wire Required on input to controller.
Generator Sizing
Refer to the chart above to determine the minimum generator size for each controller.
Generator
Nominal Fuse
Size
HP
Size
(VA)
17.8
5.0
30.0
7700
26.4
7.5
40.0
11400
37.0
10.0
50.0
16000
47.4
15.0
70.0
20500
60.6
20.0
80.0
26200
76.0
25.0
110.0
32800
94.0
30.0
135.0
40600
8.9
5.0
15.0
7700
13.2
7.5
20.0
11400
18.5
10.0
30.0
16000
23.7
15.0
40.0
20500
30.3
20.0
50.0
26200
37.5
25.0
60.0
32400
47.0
30.0
70.0
40600
20ºC
30ºC
Input
Output
Input
Cable
Cable
Cable
Min. AWG Min. AWG Min. AWG Min. AWG Min. AWG Min. AWG Min. AWG Min. AWG
10
14
10
8
12
8
8
10
8
4
8
4
4
6
4
2
4
2
2*
3
1*
14
14
14
12
14
12
10
14
10
8
12
8
8
10
8
6
8
6
4
8
4
13
40ºC
Output
Input
Output
Input
Cable
Cable
Cable
Cable
14
10
12
10
8
10
8
6
8
8
4
6
6
4
4
4
1
3
3
1*
2
14
14
14
14
12
14
14
10
12
12
8
10
10
6
10
8
4
8
8
4
6
50ºC
Output
Cable
8
12
6
8
4
8
3
6
2
4
1/0
2
1/0*
1
14
14
10
14
8
12
6
10
4
8
4
8
3
6
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