Ampacity Rating and Recommended Configurations
For installation of three-conductor ALUMINUM or three single conductor ALUMINUM 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 Tables D15A and D15B.
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 (18) |
142 |
129 |
119 |
111 |
103 |
99 |
| 2/0 (18) |
163 |
148 |
136 |
126 |
117 |
112 |
| 3/0 (18) |
186 |
168 |
155 |
143 |
132 |
126 |
| 4/0 (18) |
214 |
192 |
177 |
163 |
151 |
143 |
| 250 (35) |
236 |
212 |
194 |
178 |
165 |
157 |
| 350 (35) |
288 |
256 |
233 |
214 |
198 |
187 |
| 500 (35) |
351 |
310 |
281 |
257 |
237 |
224 |
| 600 (58) |
388 |
341 |
309 |
281 |
259 |
245 |
| 750 (58) |
435 |
381 |
344 |
313 |
287 |
271 |
| 1000 (58) |
502 |
437 |
392 |
355 |
326 |
307 |
| 1250 (91) |
556 |
480 |
429 |
389 |
356 |
336 |
| 1500 (91) |
589 |
514 |
458 |
415 |
379 |
358 |
| 1750 (127) |
632 |
541 |
481 |
435 |
397 |
375 |
| 2000 (127) |
660 |
564 |
501 |
452 |
413 |
389 |
Note
1. Allowable current for 90oC rated multiple aluminum conductor cables, or single aluminum conductors in contact, or multiplexed single aluminum 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(2)(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 (18) |
142 |
133 |
129 |
119 |
111 |
103 |
99 |
| 2/0 (18) |
163 |
154 |
148 |
136 |
126 |
117 |
112 |
| 3/0 (18) |
186 |
179 |
168 |
155 |
143 |
132 |
126 |
| 4/0 (18) |
214 |
210 |
192 |
177 |
163 |
151 |
143 |
| 250 (35) |
236 |
231 |
212 |
194 |
178 |
165 |
157 |
| 350 (35) |
288 |
256 |
233 |
214 |
198 |
187 |
| 500 (35) |
351 |
310 |
281 |
257 |
237 |
224 |
| 600 (58) |
388 |
341 |
309 |
281 |
259 |
245 |
| 750 (58) |
435 |
381 |
344 |
313 |
287 |
271 |
| 1000 (58) |
502 |
437 |
392 |
355 |
326 |
307 |
| 1250 (91) |
556 |
480 |
429 |
389 |
356 |
336 |
| 1500 (91) |
589 |
514 |
458 |
415 |
379 |
358 |
| 1750 (127) |
632 |
541 |
481 |
435 |
397 |
375 |
| 2000 (127) |
660 |
564 |
501 |
452 |
413 |
389 |
Notes:
- Allowable current for 90oC rated multiple aluminum conductor cables, or single aluminum 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 provided in the Table are the lesser of: (a) the value obtained in accordance with Rule 4-004(2) (d); or (b) the value obtained in accordance with Rule 8-104(7).
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