Cut Sheet

B36 © 2002 Thomas & Betts Corporation. Specifications are subject to change without notice. www.tnb.com
Ocal
®
B
CONDUCTORS
Conductor Metric Designator (Trade Size)
Size 16 21 27 35 41 53 63 78 91 103 129 155
Type (AWG/kcmil) (d)(f) (1) (1b)(1d) (2) (2d) (3) (3d) (4) (5) (6)
RHH, 14 4 7 12 21 28 46 66 102 136 176 276 398
RHW, 12 3 6 10 17 23 38 55 85 113 146 229 330
RHW-2 10 3 5 8 14 19 31 44 68 91 118 185 267
8 1 2 4 7 10 16 23 36 48 61 97 139
6 1 1 3 6 8 13 18 29 38 49 77 112
4 1 1 2 4 6 10 14 22 30 38 60 87
3 1 1 2 4 5 9 121926345376
2 1 1 1 3 4 7 111723294666
1 0 1 1 1 3 5 7 11 15 19 30 44
1/0 0 1 1 1 2 4 61013172638
2/0 0 1 1 1 2 4 5 8 11 14 23 33
3/0 0 0 1 1 1 3 4 7 10 12 20 28
4/0 00111 3468111724
250 00011 1346 81318
300 00011 1245 71116
350 00011 1245 61015
400 00011 1134 6913
500 00011 1134 5811
600 00001 1123 46 9
700 00001 1113 46 8
750 00000 1113 35 8
800 00000 1112 35 7
900 00000 1112 35 7
1000 0 0 0 0 0 1 1 1 1 3 4 6
TW, 14 9 15 25 44 59 98 140 216 288 370 581 839
THHW, 12 7 12 19 33 45 75 107 165 221 284 446 644
THW,
THW-2 10 5 9 14 25 34 56 80 123 164 212 332 480
8 3 5 8 14 19 31 44 68 91 118 185 267
RHH*, 14 6 10 17 29 39 65 93 143 191 246 387 558
RHW*,
RHW-2*
RHH*, 12 5 8 13 23 32 52 75 115 154 198 311 448
RHW*,
RHW-2* 10 3 6 10 18 25 41 58 90 120 154 242 350
RHH*, 8 1 4 6 11 15 24 35 54 72 92 145 209
RHW*,
RHW-2*
CONDUCTORS
Conductor Metric Designator (Trade Size)
Size 16 21 27 35 41 53 63 78 91 103 129 155
Type (AWG/kcmil) (d)(f) (1) (1b)(1d) (2) (2d) (3) (3d) (4) (5) (6)
RHH*, 6 1 3 5 8 11 18 27 41 55 71 111 160
RHW*, 4 1 1 3 6 8 14 20 31 41 53 83 120
RHW-2*, 3 1 1 3 5 7 12 17 26 35 45 71 103
TW, 2 1 1 2 4 6 10142230386087
THW, 1 1 1 1 3 4 7 10 15 21 27 42 61
THHW, 1/0 0 1 1 2 3 6 8 13 18 23 36 52
THW-2 2/0 0 1 1 2 3 5 7 11 15 19 31 44
3/0 0 1 1 1 2 4 6 9 13 16 26 37
4/0 0 0 1 1 1 3 5 8 10 14 21 31
250 00111 3468111725
300 00111 2357 91522
350 00011 1356 81319
400 00011 1346 71217
500 00011 1235 61014
600 00011 1134 5812
700 00001 1123 4710
750 00001 1123 4710
800 00001 1123 46 9
900 00001 1113 46 8
1000 0 0 0 0 0 1 1 1 2 3 5 8
THHN, 14 13 22 36 63 85 140 200 309 412 531 833 1202
THWN, 12 9 16 26 46 62 102 146 225 301 387 608 877
THWN-2 10 6 10 17 29 39 64 92 142 189 244 383 552
8 3 6 9 16 22 37 53 82 109 140 221 318
6 2 4 7 12 16 27 38 59 79 101 159 230
4 1 2 4 7 10 16 23 36 48 62 98 141
3 1 1 3 6 8 14 20 31 41 53 83 120
2 1 1 3 5 7 11 17 26 34 44 70 100
1 1 1 1 4 5 8 121925335174
1/0 1 1 1 3 4 7 10 16 21 27 43 63
2/0 0 1 1 2 3 6 81318233652
3/0 0 1 1 1 3 5 71115193043
4/0 0 1 1 1 2 4 6 9 12 16 25 36
250 0 0 1 1 1 3 5 7 10 13 20 29
300 00111 3468111725
350 00111 2357101522
400 00111 2357 81320
500 00011 1245 71116
600 00011 1134 6913
700 00011 1134 5811
750 00001 1134 5711
800 00001 1123 4710
900 00001 1123 46 9
1000 0 0 0 0 1 1 1 1 3 4 6 8
Note: This table is for concentric stranded conductors only. For compact stranded
conductors, Table C8(A) should be used.
*Types RHH, RHW, and RHW-2 without outer covering.
Table C8 Maximum Number of Conductors or Fixture Wires in Rigid Metal Conduit
(RMC) (Based on Table 1, Chapter 9)
NEC Table C8
Reprinted with permission from NFPA 70-1999, National Electrical Code
®
, Copyright © 1998, National Fire Protection Association, Quincy, MA 02269. This
reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.
National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Quincy, MA.
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