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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:

120 Volts
208 Volts 
240 Volts
277 Volts
480 Volts
Copper
Aluminum
Single Phase
Three Phase
Distance in Feet Total Amps
This Is Your Minimum Wire Size      

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.

Conduit Type:
Wire Type:

AWG or kcmil:
Quantity: Area:
AWG or kcmil:
Quantity: Area:
AWG or kcmil:
Quantity: Area:
AWG or kcmil:
Quantity: Area:

Fill Percent (%):
 
Calculated Results
Minimum Raceway:

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