Metric Conversion
Electrical Formulas
Conduit Weight
Maximum # of Conductors in Conduit
600 Volt Building Wire Weights & Ampacities
Ampacities of Insulated Conductors
Copper to Aluminum
Receptacle Configuration

Copper to Aluminum Conversion Tables

3-Conductor 75ºC Copper or Aluminum Circuitry
(Without Ground Wire)

Amps
Copper
Aluminum
Wire Size
Conduit Size
Wire Size
Conduit Size
20
#14
1/2"
#12
1/2"
25
#12
1/2"
#10
3/4"
35
#10
3/4"
#8
3/4"
50
#8
3/4"
#6
1"
65
#6
1"
#4
1 1/4"
85
#4
1"
#2
1 1/4"
100
#3
1 1/4"
#1
1 1/4"
115
#2
1 1/4"
1/0
1 1/2"
130
#1
1 1/4"
2/0
2"
150
1/0
1 1/2"
3/0
2"
175
2/0
1 1/2"
4/0
2 1/2"
200
3/0
2"
250
2 1/2"
230
4/0
2"
300
2 1/2"
255
250
2 1/2"
400
3"
285
300
2 1/2"
500
3"
310
350
2 1/2"
500
3"
335
400
3"
600
3 1/2"
380
500
3"
750
4"
420
600
3"
(2) 300
4'
460
700
3 1/2"
(2) 350
5"
475
750
4"
(2) 400
5"


4-Conductor 75ºC Copper or Aluminum Circuitry
(Without Ground Wire)

Amps
Copper
Aluminum
Wire Size
Conduit Size
Wire Size
Conduit Size
20
#14
1/2"
#12
1/2"
25
#12
1/2"
#10
3/4"
35
#10
3/4"
#8
3/4"
50
#8
3/4"
#6
1"
65
#6
1"
#4
1 1/4"
85
#4
1 1/4"
#2
1 1/4"
100
#3
1 1/4"
#1
1 1/2"
115
#2
1 1/4"
1/0
2"
130
#1
1 1/2"
2/0
2"
150
1/0
1 1/2"
3/0
2"
175
2/0
2"
4/0
2 1/2"
200
3/0
2"
250
2 1/2"
230
4/0
2 1/2"
300
3"
255
250
2 1/2"
400
3"
285
300
3"
500
3 1/2"
310
350
3"
500
3 1/2"
335
400
3"
600
4"
380
500
3 1/2"
750
4"
420
600
4"
(2) 300
4"
460
700
4"
(2) 350
5"
475
750
4"
(2) 400
5"

 

3-Conductor 75ºC Copper or Aluminum Circuitry
(With Ground Wire)

Amps
Copper
Aluminum
Wire Size
Conduit Size
Ground
Wire Size
Conduit Size
Ground
20
#14
1/2"
#16
#12
1/2"
#12
25
#12
1/2"
#14
#10
3/4"
#12
35
#10
3/4"
#12
#8
3/4"
#10
50
#8
3/4"
#10
#6
1"
#8
65
#6
1"
#8
#4
1 1/4"
#6
85
#4
1"
#8
#2
1 1/4"
#6
100
#3
1 1/4"
#8
#1
1 1/4"
#6
115
#2
1 1/4"
#6
1/0
1 1/2"
#4
130
#1
1 1/4"
#6
2/0
2"
#4
150
1/0
1 1/2"
#6
3/0
2"
#4
175
2/0
1 1/2"
#6
4/0
2 1/2"
#4
200
3/0
2"
#6
250
2 1/2"
#4
230
4/0
2"
#4
300
2 1/2"
#2
255
250
2 1/2"
#4
400
3"
#2
285
300
2 1/2"
#4
500
3"
#1
310
350
2 1/2"
#3
500
3"
#1
335
400
3"
#3
600
3 1/2"
#1
380
500
3"
#3
750
4"
#1
420
600
3"
#2
(2) 300
4'
1/0
460
700
3 1/2"
#2
(2) 350
5"
1/0
475
750
4"
#2
(2) 400
5"
1/0


4-Conductor 75ºC Copper or Aluminum Circuitry
(With Ground Wire)

Amps
Copper
Aluminum
Wire Size
Conduit Size
Ground
Wire Size
Conduit Size
Ground
20
#14
1/2"
#16
#12
1/2"
#12
25
#12
1/2"
#14
#10
3/4"
#12
35
#10
3/4"
#12
#8
3/4"
#10
50
#8
3/4"
#10
#6
1"
#8
65
#6
1"
#8
#4
1 1/4"
#6
85
#4
1 1/4"
#8
#2
1 1/4"
#6
100
#3
1 1/4"
#8
#1
1 1/2"
#6
115
#2
1 1/4"
#6
1/0
2"
#4
130
#1
1 1/2"
#6
2/0
2"
#4
150
1/0
1 1/2"
#6
3/0
2"
#4
175
2/0
2"
#6
4/0
2 1/2"
#4
200
3/0
2"
#6
250
2 1/2"
#4
230
4/0
2 1/2"
#4
300
3"
#2
255
250
2 1/2"
#4
400
3"
#2
285
300
3"
#4
500
3 1/2"
#1
310
350
3"
#3
500
3 1/2"
#1
335
400
3"
#3
600
4"
#1
380
500
3 1/2"
#3
750
4"
#1
420
600
4"
#2
(2) 300
4"
1/0
460
700
4"
#2
(2) 350
5"
1/0
475
750
4"
#2
(2) 400
5"
1/0

 


back to top