Voltage Drop Guesstimate'r
This is a 3% Voltage Drop Calculator. It may not into account all variables and should only be used as a guide.
Please enter your values:
Keep in mind this is a voltage drop calculator, not an ampacity calculator. Please see table 310.16 of the NEC for more info on conductor ampacity.
Conduit Fill Guesstimate'r
This is a Conduit Fill Guesstimate. Again just for estimating allowable 40% conduit fill. Don't forget to de-rate your conductors (NEC 310.15)! Average Area will be calculated if not known.
Ampacity Chart
Here's an ampacity chart for reference only. Please consult the NEC for all parameters including, conduit, fill ambient temperature, multiple conductor de-rating, conduit type, etc... That will effect the conductors allowable ampacity!
|
Wire Size and Amp Ratings
|
|
Wire Gauge Size
|
Copper
|
Aluminum
|
|
60°C
(140°F)
|
75°C
(167°F)
|
90°C
(194°F)
|
75°C
(167°F)
|
90°C
(194°F)
|
|
NM-B
|
THW
|
THWN-2
|
THW
|
XHHW-2
|
|
UF-B
|
THWN
|
THHN
|
THWN
|
THHN
|
| |
SE
|
XHHW-2
|
SE
|
THWN-2
|
| |
USE
|
|
USE
|
|
| |
XHHW
|
|
XHHW
|
|
|
14
|
15
|
15
|
15
|
---
|
---
|
|
12
|
20
|
20
|
20
|
15
|
15
|
|
10
|
30
|
30
|
30
|
25
|
25
|
|
8
|
40
|
50
|
55
|
40
|
45
|
|
6
|
55
|
65
|
75
|
50
|
60
|
|
4
|
70
|
85
|
95
|
65
|
75
|
|
3
|
85
|
100
|
110
|
75
|
85
|
|
2
|
95
|
115
|
130
|
90
|
100
|
|
1
|
---
|
130
|
150
|
100
|
115
|
|
1/0
|
---
|
150
|
170
|
120
|
135
|
|
2/0
|
---
|
175
|
195
|
135
|
150
|
|
3/0
|
---
|
200
|
225
|
155
|
175
|
|
4/0
|
---
|
230
|
260
|
180
|
205
|
|
250
|
---
|
255
|
290
|
205
|
230
|
|
300
|
---
|
285
|
320
|
230
|
255
|
|
350
|
---
|
310
|
350
|
250
|
280
|
|
500
|
---
|
380
|
430
|
310
|
350
|
|
600
|
---
|
420
|
475
|
340
|
385
|
|
750
|
---
|
475
|
535
|
385
|
435
|
|
1000
|
---
|
545
|
615
|
445
|
500
|