Table for Control electrical wire Assign electrical cable color from following table
Conductor #
First Tracer Color
Second Tracer Color
1
Black
---
2
Red
---
3
Blue
---
4
Orange
---
5
Yellow
---
6
Brown
---
7
Red
Black
8
Blue
Black
9
Orange
Black
10
Yellow
Black
11
Brown
Black
12
Black
Red
13
Blue
Red
14
Orange
Red
15
Yellow
Red
16
Brown
Red
17
Black
Blue
18
Red
Blue
19
Orange
Blue
20
Yellow
Blue
21
Brown
Blue
22
Black
Orange
23
Red
Orange
24
Blue
Orange
25
Yellow
Orange
26
Brown
Orange
27
Black
Yellow
28
Red
Yellow
29
Blue
Yellow
30
Orange
Yellow
31
Brown
Yellow
32
Black
Brown
33
Red
Brown
34
Blue
Brown
35
Orange
Brown
36
Yellow
Brown
480 V AC
Phase A
= Brown
Phase B
=Orange
Phase C
= Yellow
Ground
= Green
120 V AC
Hot
= Black
Neutral
= White
Control
= Red
Ground
= Green
24 V DC
Positive
= Blue
Negative
= Yellow
Control
= Orange
Ground
= Green
Determine cable size
Determine electrical wire size using table 310.16 NEC2008 on page 70-148. Simply calculate amperage (current) flow through the circuit and then apply the table.
How to calculate current? In practice, we can find out power (W) and voltage (V) of equipments through vendor information. Based on this vendor information,we'll be knowing exactly how to power the equipment. If we lack of this basic knowledge, it is so dangerous. For example, power a 120V pump through a 220V voltage source; you will burn out the pump. Knowing power and voltage, current can be determined. See electrical formulas. Be careful to apply the appropriate one phase or three phase formulas. Be plan in advance whether you will wire equipment at line to neutral or line to line voltage source. V L-L=1.73* V L-N
Table 316.16
SIZE AWG OR KCMIL
COPPER
COPPER
COPPER
ALUMINUM
ALUMINUM
ALUMINUM
SIZE AWG OR KCMIL
_
TYPE TW,UF
TYPES RHW ,THHW,THW, THWN,XHHW USE,ZW
RHW-2,THHN THHW,THW-2 (90°C)
TYPES TW,UF (60°C)
TYPES RHW THHW,THW THWN,XHHW USE
TYPES TBS,SA SIS,THHW
SIZE AWG OR KCMIL
18 16 14 12 10 8
_ _ 20 25 30 40
_ _ 20 25 35 50
14 18 25 30 40 55
_ _ _ 20 25 30
_ _ _ 20 30 40
_ _ _ 25 35 45
_ _ _ 12 10 8
6 4 3 2 1
55 70 85 95 110
65 85 100 115 130
75 95 110 130 150
40 55 65 75 85
50 65 75 90 100
60 75 85 100 115
6 4 3 2 1
1/0 2/0 3/0 4/0
125 145 165 195
150 175 200 230
170 195 225 260
100 115 130 150
120 135 155 180
135 150 175 205
1/0 2/0 3/0 4/0
250 300 350 400 500
215 240 260 280 320
255 285 310 335 380
290 320 350 380 430
170 190 210 225 260
205 230 250 270 310
230 225 280 305 350
250 300 350 400 500
600 700 750 800 900
335 385 400 410 435
420 460 475 490 520
475 520 535 555 585
285 310 320 330 335
340 375 385 395 425
385 420 435 450 480
600 700 750 800 900
1000 1250 1500 1750 2000
435 495 520 545 560
545 590 625 650 665
615 665 705 735 750
375 405 435 455 470
445 485 520 545 560
500 545 585 615 630
1000 1250 1500 1750 2000
Assume the current calculated result is 14A, electrical wire type is copper THHN, insulated conductors rated at 90° C, and so based on the table, wire size is 18 AWG. For practical safety application, recommended power wire size should be bigger than 12 AWG.
Reference
National Electrical Code 2008 IEEE- Institute of Electrical and Electronics Engineers
