Home of America's Electrical
Code Doctor
Chuck Cossin
Below is a great NEC
voltage drop calculator and
standard sizes for panels,
fuses and other devices. |
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Chuck At MECC Mtg
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Voltage Drop & Conductor
Sizing
Calculate
Suggested
Minimum Conductor Size
Assume a 3% max. conductor
voltage drop from the device
to a sub panel feeder.
Some circuit configurations
suggest a max voltage drop
of 5% - see the NEC for
details |
THIS
USE IS INTENDED ONLY FOR
QUALIFIED ELECTRICIANS.
OTHER FACTORS APPLY.
As ALWAYS - Consult the full
NEC & local authorities for
specifics.
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`PANEL BOARD
SIZES |
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Single Phase - 3 Wire
Systems |
40A | 100A | 150A | 225A
| 400A
70A | 125A | 200A | 300A
| 600 A |
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Three Phase - 4 Wire
Systems |
60A | 150A | 225A | 400A
125A | 200A | 300A |
600A |
SWITCH BOARD
AND SWITCH GEAR SIZES |
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Single Phase |
Three Phase |
200 A
400 A
600 A
800 A
1200 A
1600 A
2000 A
2500 A
3000 A
4000 A |
400 A
600 A
800 A
1200 A
1600 A
2000 A
2500 A
3000 A
4000 A
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STANDARD OCPD
SIZES
CIRCUIT BREAKERS AND
FUSES |
15 A
20 A
25 A
30 A
35 A
40 A
45 A
50 A
60 A |
70 A
80 A
90 A
100 A
110 A
125 A
150 A
175 A
200 A |
225 A
250 A
300 A
350 A
400 A
450 A
500 A
600 A
700 A |
800 A
1000 A
1200 A
1600 A
2000 A
2500 A
3000 A
4000 A
5000 A
6000 A |
Other standard FUSE
sizes are
1A, 3A, 6A, and 10A. |
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GUTTER AND
WIREWAY SIZES |
2½" x 2½"
4" x 4" |
6" x 6"
8" x 8" |
10" x 10" |
Available in 12", 24",
36", 48", and 60"
lengths. |
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STANDARD
DISCONNECT SIZES |
30A
60A
100a |
200A
400A
600A |
800A
1200A
1400A |
1600A
1800A
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PULL AND JUNCTION BOX
SIZES |
4" x 4" x 4"
6" x 4" x 4"
6" x 6" x 4"
6" x 6" x 6"
8" x 6" x 4"
8" x 6" x 6"
8" x 6" x 8"
8" x 8" x 4"
8" x 8" x 6"
8" x 8" x 8" |
10" x 8" x 4"
10" x 8" x 6"
10" x 10" x 4"
10" x 10" x 6"
10" x 10" x 8"
12" x 8" x 4"
12" x 8" x 6"
12" x 10" x 4"
12" x 10" x 6"
12" x 12" x 4" |
12" x 12" x 6"
12" x 12" x 8"
15" x 12" x 4"
15" x 12" x 6"
18" x 12" x 4"
18" x 12" x 6"
18" x 18" x 4"
18" x 18" x 6"
24" x 18" x 6"
24" x 24" x 6"
24" x 24" x 8" |
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BUSWAY AND
BUSDUCT AMPACITIES |
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Single Phase and Three
Phase |
225 A
400 A
600 A
800 A
1000 A
1200 A
1350 A |
1600 A
2000 A
2500 A
3000 A
4000 A
5000 A |
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