Ampacity Rating and Recommended Configurations
For installation of three-conductor COPPER or three single conductor COPPER cables IN UNDERGROUND DUCTS
Types RW90, RWU90 cable rated 0 to 5 kV
ATTENTION - Only these configurations are recommended by Nexans to obtain satisfactory load sharing and ampactiy. See C.E.C. Code Rules 4-004, 8-104, 12-012, Appendix B, Appendix D14A and D14B.
Notes
The ampacities in the tables on this page are based on the following conditions:
- 100% load factor
- Ambient soil temperature of 20oC
- Concrete thermal resistivity of 85oC-cm/W
- Conductor temperature of 90oC
- Spacing between duct centres of 190 mm
- Top of duct bank at 760 mm below surface
- 125 mm duct
Neutral conductors, if required, should be included with each group of phase conductors shown (ie: use 4/C cable or 4x1/C cables).
| Size AWG or kcmil |
Detail 1 |
Detail 2 |
Detail 3 |
Detail 4 |
Detail 5 |
Detail 6 |
| 1/0 (19) |
180 |
164 |
152 |
141 |
131 |
125 |
| 2/0 (19) |
206 |
187 |
172 |
160 |
149 |
142 |
| 3/0 (19) |
235 |
213 |
196 |
181 |
168 |
160 |
| 4/0 (19) |
269 |
242 |
223 |
205 |
190 |
181 |
| 250 (37) |
298 |
267 |
244 |
225 |
208 |
198 |
| 350 (37) |
361 |
321 |
293 |
268 |
248 |
235 |
| 500 (37) |
437 |
386 |
350 |
319 |
294 |
279 |
| 600 (61) |
480 |
423 |
383 |
349 |
321 |
303 |
| 750 (61) |
538 |
471 |
425 |
386 |
355 |
335 |
| 1000 (61) |
620 |
540 |
485 |
439 |
400 |
380 |
| 1250 (91) |
676 |
583 |
521 |
472 |
433 |
408 |
| 1500 (91) |
724 |
623 |
555 |
502 |
459 |
434 |
| 1750 (127) |
756 |
648 |
576 |
521 |
476 |
449 |
| 2000 (127) |
785 |
671 |
596 |
538 |
491 |
463 |
Note
1. Allowable current for 90oC rated single copper conductor cables, or single copper conductors in contact, or multiplexed single copper conductors, installed in nonmetallic underground raceway, subject to Subrules 4-004(13) and (14), where:
(a) for any load, the cable terminates at equipment of any type other than a service box, fusible switch, circuit breaker, or panel board; or
(b) the load is non-continuous and either end of the cable terminates at a service box, fusible switch, circuit breaker, or panel board.
2. The ampacities provided in the Table are the lesser of (a) the value obtained in accordance with Rule 4-004(1)(d); or (b) the value obtained in accordance with Rule 8-104(7).
| Size AWG or kcmil |
Detail 1 |
Detail 2 |
Detail 3 |
Detail 4 |
Detail 5 |
Detail 6 |
| 100% |
80% |
|
|
|
|
|
| |
|
|
|
|
|
|
|
| 1/0 (19) |
180 |
172 |
164 |
152 |
141 |
131 |
125 |
| 2/0 (19) |
206 |
200 |
187 |
172 |
160 |
149 |
142 |
| 3/0 (19) |
235 |
232 |
213 |
196 |
181 |
168 |
160 |
| 4/0 (19) |
269 |
242 |
223 |
205 |
190 |
181 |
| 250 (37) |
298 |
267 |
244 |
225 |
208 |
198 |
| 350 (37) |
361 |
321 |
293 |
268 |
248 |
235 |
| 500 (37) |
437 |
386 |
350 |
319 |
294 |
279 |
| 600 (61) |
480 |
423 |
383 |
349 |
321 |
303 |
| 750 (61) |
538 |
471 |
425 |
386 |
355 |
335 |
| 1000 (61) |
620 |
540 |
485 |
439 |
400 |
380 |
| 1250 (91) |
676 |
583 |
521 |
472 |
433 |
408 |
| 1500 (91) |
724 |
623 |
555 |
502 |
459 |
434 |
| 1750 (127) |
756 |
648 |
576 |
521 |
476 |
449 |
| 2000 (127) |
785 |
671 |
596 |
538 |
491 |
463 |
Notes:
- Allowable current for 9oC rated multiple copper conductor cables, or single copper conductors in contact, or multiplexed single copper conductors, installed in nonmetallic raceway, subject to Subrules 4-004(13) and (14), where:
(a) the load is continuous, and
(b) either end terminates at a service box, fusible switch, circuit breaker, or panel board.
- The columns with the heading "80%" denote that the equipment identified in 1(b) is not marked as certified to carry its ampere rating continuously.
- The columns with the heading "100%" denote that the equipment identified in 1(b) is marked as certified to carry its ampere rating continuously.
- The ampacities provide are the lesser of: (a) the value obtained in accordance with Rule 4-004(1)(d); or (b) the value obtained in accordance with Rule 8-104(7).
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