Canadian Electrical Code, Part I Full Impact Assessment · PDF filehave been determined using the Neher-McGrath methodology, calculation method in as applied in IEEE 835, for the cable

Canadian Electrical Code, Part I Full Impact Assessment

Subject 3827 Recalculated underground ampacity tables

© Copyright CSA Group 2015

Canadian Electrical Code, Part I — Full Impact Assessment Subject 3827 Recalculated underground ampacity tables

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CONTENTS

1 INTRODUCTION TO THE FULL IMPACT ASSESSMENT................................................... 3

2 PURPOSE OF THE FULL IMPACT ASSESSMENT............................................................. 3

3 BACKGROUND OF THE CHANGE ...................................................................................... 3

4 THE NATURE OF THE CHANGE ......................................................................................... 4

5 PURPOSE/REASON FOR THE CHANGE.......................................................................... 21 5.1 What is the issue that the change is intended to address? .............................................. 21 5.2 How does the change accomplish the desired results? ................................................... 21 5.3 What are the implications/consequences if action is not taken? ...................................... 21

6 WHY IS ACTION REQUIRED AT THIS TIME?................................................................... 21

7 (14) PREVALENCE OF RULE USE IF ACCEPTED ........................................................... 21

8 IMPACT ON KEY STAKEHOLDERS.................................................................................. 21 8.1 (16) Largest type of stakeholder who would benefit ......................................................... 21 8.2 (24) Largest type of stakeholder who would be negatively affected................................. 22 8.3 (15) Other stakeholders affected on a frequent basis ...................................................... 22 8.4 Is the proposed change limited to a specific group/geographic area?.............................. 22 8.5 What is the affected stakeholders’ readiness to act on the change(s)? ........................... 23 8.6 Recommended stakeholder management strategy.......................................................... 23 8.7 Communication and implementation plan ........................................................................ 23

9 ANALYSIS OF ANTICIPATED ECONOMIC IMPACT ........................................................ 23 9.1 (20) The jurisdiction or stakeholder’s ability to compete, based on incompatibility with other standards ............................................................................................................................... 23 9.2 (21) Complexity of implementation (is training required to implement the Rule?) ............ 23 9.3 (22) Total costs to implement (for example, cost to install, educate, manufacture, inspect, purchase additional product, and of the increased use of electricity) ................................ 23

10 IMPACT ON BUSINESS: LARGE AND SMALL (IF APPLICABLE) .................................. 23

11 WHAT IS THE PRACTICE/EXPERIENCE IN OTHER JURISDICTIONS? ......................... 24 11.1 Are standards consistent with (or lesser/greater than) other jurisdictions? ...................... 24 11.2 (23) Conflict with other Ministries or Codes...................................................................... 24 11.3 Consequences for other Departments/Ministries, e.g., apprentice training...................... 24


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11.4 Consequences for other Codes from other jurisdictions (US, European standards) ........ 24

12 CONSULTATION PROCESS .............................................................................................. 24

13 PROPOSED EFFECTIVE DATE OF CHANGES ................................................................ 25

APPENDIX 1 — CODE RANKING TOOL VALUES ...................................................................... 26


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1 INTRODUCTION TO THE FULL IMPACT ASSESSMENT

The Full Impact Assessment follows the rationale of the Canadian Electrical Code Ranking Tool (CRT) and provides supporting information to validate the rankings of the CRT. It includes all the questions of the CRT either verbatim or modified. However, the scope of the Full Impact Assessment extends beyond that of the CRT and, therefore, the assessment includes additional questions that may help to substantiate the rankings.

The CRT is referenced throughout the Full Impact Assessment. The questions from the CRT are identified in the Full Impact Assessment by numbers in parentheses. Whenever applicable, chapter titles also include references to the relevant sections of the CRT.

The Full Impact Assessment follows the sequence of the CRT as closely as possible but, to enhance the analytical function of the document, risk-related and benefits-related questions have not been separated in the Full Impact Assessment.

2 PURPOSE OF THE FULL IMPACT ASSESSMENT

The purpose of the Full Impact Assessment is to provide the provinces and territories with an enhanced rationale and detailed assessment of a particular change to the Canadian Electrical Code, Part I (CE Code, Part I). This assessment is submitted for review to provincial and territorial regulatory authorities to aid with their adoption process for the Code. Jurisdictions may decide to conduct further analyses or to hold additional consultations.

3 BACKGROUND OF THE CHANGE

When an insulated conductor carries current, the temperature of the conductor increases, and continues to increase, as the conductor's current increases, potentially exceeding the conductor’s insulation temperature rating. Rule 4-004 sets out requirements for methods of controlling or reducing conductor temperature. Rule 4-004(1)(d) and(2)(d) specify wiring methods and correction factors used to ensure that conductor temperatures for conductors in an underground run, directly buried or in a raceway, stay within the operating limits of their insulation.

The ampacity Tables in the Code are migrating to raw (calculated) ampacities, which may be limited by various Rules and correction factors in the Code. Tables 1 to 4 have been partially recalculated to reflect this shift.

In order to align the existing underground Tables (D8A to D15B) with the rest of the Code, the “A” Tables were recalculated, making the “B” Tables unnecessary.* Also, these Tables were originally intended to be limited to unshielded cables rated not more than 5 kV. Rule 4-004 (1)(d) and (2)(d) and the titles of the Tables have been changed to reflect this limitation. *In the new Tables, the designations “A” and “B” refer to copper and aluminum, respectively.


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4 THE NATURE OF THE CHANGE

(A) Revise Rule 4-004(1)(d) and (2)(d) as follows:

4-004 Ampacity of wires and cables (see Appendixces B and I)

(1) The maximum current that a copper conductor of a given size and insulation is permitted to may carry shall be as follows: (a) no change (b) no change (c) no change (d) single-conductor and 2-, 3-, and 4-conductor cables and single-conductor and 2-, 3-,

and 4-conductor metal-armoured and metal-sheathed cables, unshielded and rated not more than 5 kV, in conductor sizes No. 1/0 AWG and larger, installed in accordance with configurations described in Diagrams D8 to D11B4-1 to B4-4 in an underground run, directly buried or in a raceway, as specified in Tables D8A to through D11B D15B or as calculated by the IEEE 835 calculation method;

(e) …. (2) The maximum current that an aluminum conductor of a given size and insulation is

permitted to may carry shall be as follows: (a) no change (b) no change (c) no change (d) single-conductor and 2-, 3-, and 4-conductor cables and single-conductor and 2-, 3-,

and 4-conductor metal-armoured and metal-sheathed cables, unshielded and rated not more than 5 kV, in conductor sizes No. 1/0 AWG and larger, installed in accordance with configurations described in Diagrams D8 to D11B4-1 to B4-4 in an underground run, directly buried or in a raceway, as specified in Tables D8A to through D11B D15B or as calculated by the IEEE 835 calculation method;

(e) …. (B) Revise the Appendix B Note to Rule 4-004(1)(d) and (2)(d) as follows:

Rules 4-004(1)(d) and (2)(d) The ampacities shown in Tables D8A to D11B inclusive and D12A to D15B inclusive have been determined using the Neher-McGrath methodology, calculation method in as applied in IEEE 835, for the cable arrangements shown in Diagrams D8B4-1, D9B4-2, D10B4-3, and D11B4-4. The “A” tables are applicable where no temperature-sensitive equipment is connected or where such equipment is connected but the load is non-continuous. In cases where the calculated “A” table value exceeds the corresponding Table 1 or 3 value, the calculated value is replaced by the Table 1 or 3 value. The “B” tables are applicable where the load is continuous and temperature-sensitive


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equipment is connected. In cases where the calculated “B” table value exceeds the corresponding Table 1 or 3 value, the calculated value is replaced by the Table 1 or 3 value derated in accordance with Rule 8-104. (Both derated values, corresponding to equipment marked for 100% of its rating and 80% of its rating respectively, are given in the “B” tables, when those values are less than the calculated value.) “A” and “B” tablesTables D8A to D11B are based on 90 °C, and the values given are limited as described above. If equipment rated at 75 °C, (for example), is connected, then Rule 4-006 applies may limit the conductor termination ampacity., and the allowable current is limited to the 75 °C column of Table 1 or 3, derated in accordance with Rule 8-104, instead of the 90 °C limitation that is built into the “A” and “B” tables. For “stacked” arrangements of two single conductors per phase in parallel (one row located vertically over another row), it is recommended that ampacities be obtained from the Detail 5 column of Table D8A or D8B (copper) or Table D8BD9A or D9B (aluminum) for direct buried cables, or from the Detail 2 column of Table D9AD10A or D10B (copper) or Table D9BD11A or D11B (aluminum) for cables in underground raceways.* For single-conductor metal-armoured and metal-sheathed cables in which the sheath, armour, or bonding conductors are bonded at more than one point, the derating factors of Rule 4-010 apply, unless the ampacity has been determined by detailed calculation according to the method outlined in Items Rule 4-004(1)(e), (1)(f), (2)(e), and (2)(f). It is recommended that ampacities for three single conductors per phase and for five single conductors per phase with spacings, directly buried in the earth, be selected from Table D8A (copper) or D8B or Table D8B (aluminum)D9A or D9B for the installation configurations of Diagram D8B4-1, Detail 5 and Detail 7, respectively. It is recommended that ampacities for three single conductors per phase and for five single conductors per phase installed in separate underground conduits in a single bank be selected from Table D9A (copper)D10A or D10B or Table D9B (aluminum)D11A or D11B for the installation configurations of Diagram D9B4-2, Detail 3 and Detail 4, respectively.* It is recommended that ampacities for three-conductor cables and for three single-conductor cables grouped, directly buried in the earth, be selected from Table D10AD12A or D12B (copper) or Table D10BD13A or D13B (aluminum) for installation configurations of Diagram D10B4-3, and ampacities those for three-conductor cables in separate underground raceways be selected from Table D11AD14A or D14B (copper) or Table D11BD15A or D15B (aluminum) for installation configurations of Diagram D11B4-4. It is recommended that ampacities for seven three-conductor cables in separate


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underground raceways be selected from Table D11AD14A or D14B (copper) or D11BD15A or D15B (aluminum) for installation configurations of Diagram D11B4-4, Detail 8. It is recommended that the ampacities of groups of conductors in twos, and two-conductor cables, be obtained from the ampacity Tables D10A to D11BD12A to D15B inclusive for groups of three conductors, and three-conductor cables, for the appropriate spacings between groups and numbers of conductors in parallel.* The neutral conductor of a three-phase, four4-wire system need not be counted in the determination of ampacities. Underground ampacities for conductor temperatures of 75 °C and 60 °C respectively may be obtained by multiplying the appropriate ampacity at a 90 °C conductor temperature from Tables D8A to D11BD15B by the derating factor 0.886 (for 75 °C) or 0.756 (for 60 °C).* Ampacities for underground installations at ambient earth temperatures other than the assumed values of 20 °C may be obtained by multiplying the appropriate underground ampacity obtained from Tables D8A to D11BD15B by the following factor:

where Tae = the new ambient temperature.* *Where precisely calculated values are not available. ….


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(C) Revise and renumber Tables D8A, D9A, D10A, D11A, D12A, D13A, D14A, and D15A, and

move the associated Diagram from Appendix B to Appendix D as applicable to each set of Tables:

Diagram D8B4-1 Installation configurations — Direct buried


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Table D8A Allowable copper conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configuration of Diagram D8B4-1 (See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 2/Phase 4/Phase 4/Phase 6/Phase 6/Phase or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5 Detail 6 Detail 7

1/0 315 269 288 204 221 171 186 2/0 357 304 326 230 249 192 209 3/0 405 343 369 259 281 217 236 4/0 458 388 418 292 317 244 265 250 499 422 454 317 344 265 289 300 550 464 500 348 378 291 317 350 597 503 543 376 409 314 342 400 642 540 582 403 439 336 366 500 721 605 654 451 491 375 409 600 790 662 716 493 536 410 447 750 885 740 801 549 598 457 498 900 972 810 877 599 653 498 543

1000 1020 850 921 629 686 522 570 1250 1132 941 1020 694 757 576 629 1500 1227 1017 1104 749 817 621 678 1750 1308 1083 1176 796 869 659 720 2000 1376 1138 1236 835 911 691 755

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors with spacings directly buried in earth. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors with spacings directly buried in earth, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (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).


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Table D8BD9A Allowable aluminum conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configuration of Diagram D8B4-1

(See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 2/Phase 4/Phase 4/Phase 6/Phase 6/Phase or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5 Detail 6 Detail 7

1/0 244 208 223 158 172 133 144 2/0 276 236 253 179 194 150 163 3/0 313 266 286 201 218 169 183 4/0 356 302 325 227 247 190 207 250 387 328 353 247 268 206 225 300 427 361 389 271 294 226 247 350 464 391 422 293 319 245 267 400 498 420 453 314 342 262 286 500 561 472 509 352 383 293 320 600 617 518 559 386 420 321 350 750 694 581 628 432 470 359 392 900 764 638 691 473 515 393 429

1000 807 673 729 498 543 414 452 1250 906 753 817 556 606 461 503 1500 992 822 893 605 661 502 548 1750 1068 884 960 649 709 538 588 2000 1134 937 1018 687 751 569 622

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors with spacings directly buried in earth. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors with spacings directly buried in earth, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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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Diagram D9B4-2 Installation configurations — Conduit or raceway


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Table D9AD10A Allowable copper conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configuration of Diagram D9B4-2 (See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 4/Phase 6/Phase or kcmil Detail 1 Detail 2 Detail 3 Detail 4

1/0 258 221 181 165 2/0 293 250 205 186 3/0 333 283 231 210 4/0 378 321 261 237 250 414 351 285 258 300 458 387 313 284 350 499 420 339 307 400 537 451 364 329 500 607 507 408 369 600 669 558 447 404 750 754 626 500 451 900 832 687 547 492

1000 875 722 574 517 1250 978 803 635 572 1500 1065 870 687 617 1750 1140 928 731 656 2000 1203 976 767 689

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors with spacings installed in non-metallic underground raceways. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors with spacings installed in non-metallic underground raceway, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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).


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Table D9BD11A Allowable aluminum conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configuration of Diagram D9B4-2 (See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 4/Phase 6/Phase

or kcmil Detail 1 Detail 2 Detail 3 Detail 4

1/0 199 171 141 128 2/0 226 194 159 145 3/0 257 219 179 163 4/0 293 249 203 184 250 321 272 221 201 300 355 300 243 221 350 386 326 264 239 400 416 351 283 256 500 471 395 318 288 600 521 435 350 316 750 590 491 392 354 900 652 540 431 388

1000 690 570 454 409 1250 783 643 509 458 1500 861 703 555 499 1750 930 757 596 536 2000 991 804 632 567

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors with spacings installed in non-metallic underground raceways. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors with spacings installed in non-metallic underground raceway, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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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Diagram D10B4-3 Installation configurations — Direct buried

(continued)


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Diagram D10B4-3

Installation configurations — Direct buried (concluded)


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Table D10AD12A Allowable copper conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configurations of Diagram D10B4-3

(See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 3/Phase 4/Phase 5/Phase 6/Phase

or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5 Detail 6

1/0 262 221 195 181 170 163 2/0 298 250 220 205 192 184 3/0 337 282 248 230 216 207 4/0 382 319 280 260 244 233 250 418 348 306 283 265 253 300 462 382 336 310 291 278 350 500 413 362 335 314 300 400 538 443 388 358 336 320 500 602 494 432 398 373 356 600 658 538 470 433 405 387 750 731 595 518 478 447 426 900 795 643 560 515 481 458

1000 827 669 582 535 500 476 1250 907 728 632 581 542 516 1500 966 772 670 615 574 546 1750 1017 809 702 643 600 571 2000 1060 840 728 667 622 591

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors with spacings directly buried in earth. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated multiple copper conductor cables, or single conductors in contact, or multiplexed single copper conductors, directly buried in earth, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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).


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Table D10BD13A Allowable aluminum conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configurations of Diagram D10B4-3 (See Rule 4-004.)

Size, AWG 1/Phase 2/Phase 3/Phase 4/Phase 5/Phase 6/Phase

or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5 Detail 6

1/0 203 172 152 141 132 127 2/0 230 193 171 159 149 143 3/0 261 219 193 179 168 161 4/0 298 249 219 203 190 182 250 324 270 238 220 207 197 300 359 298 262 242 227 217 350 390 323 284 262 246 235 400 419 347 304 281 263 251 500 473 389 340 314 294 281 600 522 428 374 345 323 308 750 586 478 417 384 359 342 900 643 522 455 418 391 373

1000 677 548 477 439 410 391 1250 757 608 528 485 453 431 1500 819 655 568 521 487 463 1750 873 695 602 552 515 490 2000 917 727 630 577 538 512

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors with spacings directly buried in earth. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated multiple aluminum conductor cables, or single aluminum conductors in contact, or multiplexed single aluminum conductors, directly buried in earth, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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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Diagram D11B4-4

Installation configurations — Conduit or raceway

(continued)


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Diagram D11B4-4 Installation configurations — Conduit or raceway (concluded)


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Table D11AD14A Allowable copper conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configurations of Diagram D11B4-4 (See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 3/Phase 4/Phase 5/Phase 6/Phase 8/Phase

or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5 Detail 6 Detail 8

1/0 205 185 169 158 147 139 130 2/0 233 210 192 179 166 157 147 3/0 266 239 218 202 188 178 166 4/0 303 271 247 229 212 201 187 250 335 298 271 251 232 219 204 300 370 329 298 276 255 241 224 350 403 357 323 299 276 261 242 400 434 384 347 320 295 279 259 500 489 430 388 357 329 310 288 600 539 472 424 390 359 339 314 750 601 524 470 431 397 374 346 900 655 569 509 466 428 403 373

1000 683 593 530 485 445 419 388 1250 752 649 578 528 484 455 421 1500 804 691 614 561 513 482 445 1750 847 726 644 587 537 504 466 2000 901 744 659 601 549 515 476

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductors installed in underground raceways. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements.

Notes: (1) This Table gives the allowable current for 90 °C rated single copper conductor cables, or single copper conductors in contact, or multiplexed single copper conductors, installed in underground raceway, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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).


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Table D11BD15A Allowable aluminum conductor ampacities for cables rated not more than 5000 V and unshielded for the installation configurations of Diagram D11B4-4 (See Appendix B Note to Rule 4-004.)

Size, AWG 1/Phase 2/Phase 3/Phase 4/Phase 5/Phase

or kcmil Detail 1 Detail 2 Detail 3 Detail 4 Detail 5

6/Phase Detail 6

8/Phase Detail 8

1/0 157 143 131 122 114 108 101 2/0 179 162 148 138 129 122 114 3/0 205 184 168 157 146 138 129 4/0 235 210 192 178 165 156 146 250 258 231 210 195 180 171 159 300 286 255 232 215 199 188 175 350 312 278 252 233 215 204 189 400 337 299 271 250 231 218 203 500 382 337 305 281 259 245 227 600 424 373 336 309 285 269 249 750 478 419 376 346 318 300 278 900 527 459 412 378 347 327 303

1000 555 483 433 397 364 343 318 1250 626 541 482 441 404 380 351 1500 679 585 520 475 435 409 377 1750 724 621 552 503 461 432 399 2000 777 646 573 522 477 448 413

Notes: (1) This Table gives the allowable current for 90 °C rated single aluminum conductors installed in underground raceways. (2) Underground ampacities for a conductor temperature of 75 °C may be obtained by multiplying the appropriate ampacity at 90 °C conductor temperature by the derating factor 0.886. (3) See Rule 4-006 for equipment termination temperature requirements. Notes: (1) This Table gives the allowable current for 90 °C rated multiple aluminum conductor cables, or single aluminum conductors, installed in underground raceway, subject to Rule 4-004(16) and (17), where (a) for any load, the cable terminates at equipment of any type other than a fusible switch or circuit breaker; or (b) the load is non-continuous and either end of the cable terminates at a fusible switch or circuit breaker. (2) The ampacities provided in this 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).

(D) Delete Tables D8B, D9B, D10B, D11B, D12B, D13B, D14B, and D15B.


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5 PURPOSE/REASON FOR THE CHANGE

5.1 What is the issue that the change is intended to address?

The Tables have been revised to align with a maximum voltage of 5 kV. The underground ampacity Tables did not line up with Tables 1 to 4 with respect to calculated continuous and non-continuous loads and were organized into two Tables (an “A” Table and a “B” Table). This made the application of the Tables open to misinterpretation. Moreover, the installation configurations were found in Appendix B while the ampacity Tables were found in Appendix D. This made it cumbersome to work with them.

5.2 How does the change accomplish the desired results?

Like the other ampacity Tables, the Appendix D Tables have been revised to give the ampacity of the conductors used in an underground installation without the correction factors from Rule 8-104 (calculated loads) being applied to the ampacity ratings. Also, the installation configuration Diagrams have been moved to the Tables that give the ampacity ratings for that underground installation configuration. The format is now similar to the format of the new medium-voltage cable ampacity Tables.

5.3 What are the implications/consequences if action is not taken?

The changes made to the layout and organization of the ampacity Tables and installation configuration Diagrams are meant to improve the efficiency of Code implementation. If this change is not made at this time, the application of these requirements will continue to be cumbersome and open to misinterpretation.

6 WHY IS ACTION REQUIRED AT THIS TIME?

Action is required at this time to standardize the format for underground installations and medium-voltage installations, thus making the Code more consistent and easier to implement.

7 (14) PREVALENCE OF RULE USE IF ACCEPTED

Because this change is mandatory for all underground installations using conductors sized 1/0 AWG and larger, it will be applied very frequently.

8 IMPACT ON KEY STAKEHOLDERS

8.1 (16) Largest type of stakeholder who would benefit

Engineers/Designers: The underground ampacity Tables and configuration Diagrams

have been reorganized to improve the efficiency of Code implementation. Less time and effort will be required to determine conductor sizes. This group of stakeholders is interested in providing cost-effective and safe designs and installation requirements to


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minimize the risk of injury to personnel, damage to facilities, and insurance and legal costs. As such, engineers/designers will need to receive a communication about the change (e.g., a formal letter from the authority having jurisdiction).

8.2 (24) Largest type of stakeholder who would be negatively affected

Trainers: This is a broad group that may include those providing training to other

stakeholder groups, such as electrical contractors and installers of equipment as well as repair and maintenance personnel where applicable. Training programs and literature, including electronic content, will need to be updated to include the change.

8.3 (15) Other stakeholders affected on a frequent basis

The change will affect a broad range of stakeholder groups, as follows:

Electrical contractors: This group of stakeholders is responsible for the application of

the Code. As such, they need to be informed about changes to it to help ensure full compliance with its requirements. The updates can be delivered through formal training or through industry literature, depending on current practices in a particular jurisdiction. It is the responsibility of individual contractors to keep themselves informed about changes to the Code.

Other standards development organizations (SDOs): All references to the provisions

of the Code that are being changed will need to be updated in documents published by other SDOs.

Provincial/territorial electrical regulatory authorities: This group of stakeholders is responsible for enforcement of the Code and will, therefore, need to be informed of changes to it.

Insurance: Insurance policies contingent on following the Code will need to be updated.

Builders: This group will need to be informed of the change because the new

requirements will have to be implemented in new construction.

Inspectors: This group of stakeholders is accountable for enforcing compliance with the

Code and needs, therefore, to stay informed about changes to it. It is the responsibility of a particular province or territory to make the information on Code changes available to electrical inspectors. Depending on the practice in a particular jurisdiction, changes can be communicated through training (provided by the jurisdiction or a third party) or through jurisdiction-specific or national industry literature.

8.4 Is the proposed change limited to a specific group/geographic area?

The change will have nationwide application.


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8.5 What is the affected stakeholders’ readiness to act on the change(s)?

Research has not revealed any evidence of the market not being ready to implement this change.

8.6 Recommended stakeholder management strategy

Not applicable.

8.7 Communication and implementation plan

Not applicable.

9 ANALYSIS OF ANTICIPATED ECONOMIC IMPACT

9.1 (20) The jurisdiction or stakeholder’s ability to compete, based on incompatibility with other standards

The change should not affect a jurisdiction’s competitive position.

9.2 (21) Complexity of implementation (is training required to implement the Rule?)

The change can be included as an update in existing training programs. No specific training is recommended to introduce the change.

9.3 (22) Total costs to implement (for example, cost to install, educate, manufacture, inspect, purchase additional product, and of the increased use of electricity)

There will be a one-time cost to revise training material for trainers and engineers/designers. There is not expected to be a significant increase in the cost of manufacturing, installation, or inspection.

10 IMPACT ON BUSINESS: LARGE AND SMALL (IF APPLICABLE)

Compliance costs: No additional costs are expected to result from compliance with the change.

Change of investment: Not applicable.

Job creation/job loss: Not applicable.

Labour mobility: Not applicable.

Impact on import/export of goods: Not applicable.

Certification and licensing: Not applicable.

Insurance: Not applicable.


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11 WHAT IS THE PRACTICE/EXPERIENCE IN OTHER JURISDICTIONS?

11.1 Are standards consistent with (or lesser/greater than) other jurisdictions?

Currently, there are no deviations from this requirement of the national Code in provincial electrical codes. Input from other jurisdictions is pending. 11.2 (23) Conflict with other Ministries or Codes

No conflict has been observed. 11.3 Consequences for other Departments/Ministries, e.g., apprentice training

Not applicable. 11.4 Consequences for other Codes from other jurisdictions (US, European standards)

Not applicable.

12 CONSULTATION PROCESS

Representatives from the following groups of stakeholders were involved in the consensus approval of this change as part of CSA Group’s standards development process: Note: For details about the standards development process as it applies to the CE Code, Part I, please refer to Appendix C of the Code.

Regulatory authorities from various provincial, territorial, and municipal electrical inspection authorities

Owners/Operators/Producers from groups with national stature, representing the viewpoints of electrical equipment manufacturers, electrical installation designers and installers, and electrical installation users

General interest groups with national stature, representing the viewpoints of

(a) fire chiefs;

(b) electric utilities;

(c) committees responsible for related electrical codes and standards;

(d) fire insurers;

(e) labour;

(f) issuers of building codes; and

(g) educators.

A regulatory/legislative body may want to hold additional consultations with all or some of these

groups within its jurisdiction to clarify issues specific to the jurisdiction.


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13 PROPOSED EFFECTIVE DATE OF CHANGES

The change will be included in the 2015 edition of the CE Code, Part I, to be published in January 2015.


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APPENDIX 1 — CODE RANKING TOOL VALUES

Subject # 3827

1

1

9

5

10

5

8

39

10

4

3

6

23

0

7

2

0

1

10

Total 72

Purely administrative

Community's desire to change - Environment, Health, Safety

Safety consideration (Severity)

Safety consideration (Frequency)

For clarity

Crucial to harmonize

Technological change/New Rule

Total Score for Extent of Use

Total Score for Reason for Change

Extent of Use & Value AddPrevalence of rule use if accepted

Number of stakeholders affected on frequent basis

Complexity of implementation

Largest type of stakeholder who would be negatively affected

Total Score for Risk of Changing Rule/ Staying Status Quo

Reason for Change

Risk for Changing Rule/Staying Status

The jurisdiction or stakeholder's ability to compete based on

incompatibility with other standards

Total costs to implement, e.g. cost to install, to educate, to manufacture,or inspect, increased product cost, increased cost of electricity.

Conflict with other Ministries or Code

Largest type of stakeholder who would benefit

Benefit to society

Canadian Electrical Code, Part I Full Impact Assessment · PDF filehave been determined using the Neher-McGrath methodology, calculation method in as applied in IEEE 835, for the cable

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