Cut Sheet

Wire Safe
®
Wireway and Wiring Trough
G-25
Wire Management Products
COLUMN A — PERCENT OF VALUES IN COLUMN B** — PERCENT OF VALUES IN
TABLES AS ADJUSTED FOR AMBIENT TABLES AS ADJUSTED FOR AMBIENT
NUMBER OF CONDUCTORS TEMPERATURE IF NECESSARY NUMBER OF CONDUCTORS TEMPERATURE IF NECESSARY
4 through 6 80 4 through 6 80
7 through 9 70 7 through 9 70
10 through 24* 70 10 through 20 50
25 through 42* 60 21 through 30 45
43 and above* 50 31 through 40 40
— — 41 through 60 35
* These factors include the effects of a load diversity of 50 percent. ** No diversity.
Wirefill Chart
AREA OF CONDUCTOR (SQ. IN.)
A B C D WIRE SAFE
®
WIREWAY SIZE AND MAXIMUM NUMBER OF CONDUCTORS ALLOWED
CONDUCTOR RFH-2, RH, TF, TFN, (AREAS SHOWN ARE 20% OF THE FULL INTERIOR CROSS SECTIONAL AREA OF THE WIREWAY)
SIZE RHH, ***RHW, THW, THHN, XHHW, 2X2 (0.6 IN.
2
) 3X3 (1.5 IN.
2
) 4X4 (2.7 IN.
2
) 6X6 (6.4 IN.
2
)
AWG-MCM ***SF-2 †TW THWN ††ZW A B C D A B C D A B C D A B C D
18 .0167 .0088 .0062 — 36 68 96 — 89 170 241 — 161 306 435 — 383 727 1032 —
6 .0196 .0109 .0079 — 31 55 76 — 76 137 189 — 137 247 341 — 326 587 810 —
14 .0230 .0135 .0087 — 26 44 69 — 65 111 172 — 117 200 310 — 278 474 735 —
14 *.0327 — — — 18 — — — 45 — — — 82 — — — 195 — — —
14 — †.0206 — .0131 — 29 — 46 — 72 — 114 — 131 — 206 — 310 — 488
12 .0278 .0172 .0117 — 21 35 51 — 53 87 128 — 97 156 230 — 230 372 547 —
12 *.0384 — — — 16 — — — 39 — — — 70 — — — 166 — — —
12 — †.0252 — .0167 — 24 — 36 — 59 — 89 — 107 — 161 — 253 — 383
10 .0460 .0222 .0184 — 13 27 33 — 32 67 81 — 58 121 146 — 139 288 347 —
10 — .0311 — .0216 — 19 — 28 — 48 — 69 — 86 — 125 — 205 — 296
8 .0845 .0471 .0373 — 7 13 16 — 17 31 40 — 31 57 72 — 75 135 171 —
8 — †.0598 — .0456 — 10 — 13 — 25 — 32 — 45 — 59 — 107 — 140
6 .1238 .0819 .0519 .0625 4 7 11 10 12 18 28 24 21 32 52 43 51 78 123 102
4 .1605 .1087 .0845 .0845 4 6 7 7 9 13 17 17 16 24 31 31 39 58 75 75
3 .1817 .1263 .0995 .0995 3 5 6 6 8 11 15 15 14 21 27 27 35 50 64 64
2 .2067 .1473 .1182 .1182 3 4 5 5 7 10 12 12 13 18 22 22 30 43 54 54
1 .2715 .2027 .1590 .1590 2 3 4 4 5 7 9 9 9 13 16 16 23 31 40 40
1/0 .3107 .2367 .1893 .1893 2 2 3 3 4 6 7 7 8 11 14 14 20 27 33 33
2/0 .3578 .2781 .2265 .2265 1 2 2 2 4 5 6 6 7 9 11 11 17 23 28 28
3/0 .4151 .3288 .2715 .2715 1 1 2 2 3 4 5 5 6 8 9 9 15 19 23 23
4/0 .4840 .3904 .3278 .3278 1 1 1 1 3 4 4 4 5 6 8 8 13 16 19 19
250 .5917 .4877 .4026 .4026 1 1 1 1 2 3 3 3 4 5 6 6 10 13 15 15
300 .6837 .5581 .4669 .4669 — 1 1 1 2 2 3 3 3 4 5 5 9 11 13 13
350 .7620 .6291 .5307 .5307 — — 1 1 1 2 2 2 3 4 5 5 8 10 12 12
400 .8365 .6969 .5931 .5931 — — 1 1 1 2 2 2 3 3 4 4 7 9 10 10
500 .9834 .8316 .7163 .7163 — — — — 1 1 2 2 2 3 3 36788
600 1.1940 1.0261 .8791 .9043 — — — — 1 1 1 1 2 2 3 35677
700 1.3355 1.1575 1.0011 1.0297 — — — — 1 1 1 1 2 2 2 24566
750 1.4082 1.2252 1.0623 1.0936 — — — — 1 1 1 1 1 2 2 24565
800 1.4784 1.2908 1.1234 1.1499 — — — — 1 1 1 1 1 2 2 24455
900 1.6173 1.4208 1.2449 1.2668 — — — — — 1 1 1 1 1 2 23455
1000 1.7530 1.5482 1.3623 1.3893 — — — — — — 1 1 1 1 1 13444
1250 2.2062 1.9532 — 1.7671 — — — — — — — — 1 1 — 1 2 3 — 3
1500 2.5475 2.2751 — 2.0612 — — — — — — — — 1 1 — 1 2 2 — 3
1750 2.8832 2.5930 — 2.3779 — — — — — — — — — 1 — 1 2 2 — 2
2000 3.2079 2.9013 — 2.6590 — — — — — — — — — — — 1 1 2 — 2
* Dimensions of RHH and RHW.
*** Dimensions of RHH and RHW without outer covering are the same as THW No. 18
through No. 10, solid as well as No. 8 and larger, stranded.
† Dimensions of THW in sizes No. 14 through No. 8. No. 6 THW and larger are same
dimension as TW.
†† No. 14 through No. 2.
NOTES:
1) The ampacities of the conductors shall be reduced as shown in the table below.
2) Refer to the National Electrical Code
®
for ambient temperature correction factors.