TRANSFORMER SECONDARY FAULT CURRENTS TABLES
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1 TRANSFORMER SECONDARY FAULT CURRENTS TABLES The information contained herein is made available to engineers, consultants and contractors solely for the purpose of providing help to Alabama Power Company customers in their selection of customer-owned service equipment. This data should be used for no other purpose. Assuming incorrect transformer or service sizes, when choosing values from the tables, can lead to errors in equipment selection and result in catastrophic failure of equipment. Alabama Power Company does not warrant this information and reserves the right to change the data in these tables without notice. The user of the information contained herein is fully responsible for correct use of this data; by making this data available, Alabama Power does not assume any responsibility relating to the use of the data or the customer-owned equipment. The information is not to be used for determining personal protective equipment requirements for arc flash hazards. Use of this data for such purposes may lead to incorrect selection of personal protective equipment and could result in injuries. SEE NEXT PAGE FOR TABLE OF CONTENTS
2 Effective October 24, 2013 Page 2 of 27 TABLE OF CONTENTS Pad Mounted Transformers KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#4/0 Aluminum Multiplex) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#4/0 Aluminum Multiplex) KVA Overhead Transformer (4 # 500 KCM Aluminum) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#4/0 Aluminum Multiplex) KVA Overhead Transformer (4 # 500 KCM Aluminum) KVA Overhead Transformer (4 # 1000 KCM Aluminum) KVA Overhead Transformer (#1/0 Aluminum Multiplex) KVA Overhead Transformer (#4/0 Aluminum Multiplex) KVA Overhead Transformer (4 # 500 KCM Aluminum) KVA Overhead Transformer (4 # 1000 KCM Aluminum) KVA Overhead Transformer (#4/0 Aluminum Multiplex) KVA Overhead Transformer (4 # 500 KCM Aluminum) KVA Overhead Transformer (4 # 1000 KCM Aluminum) KVA Overhead Transformer (4 X 2 # 1000 KCM Aluminum) KVA Overhead Transformer (4 X 3 # 1000 KCM Aluminum) KVA Overhead Transformer (4 # 1000 KCM Aluminum) KVA Overhead Transformer (4 X 3 # 1000 KCM Aluminum) KVA Overhead Transformer (4 X 3 # 1000 KCM Aluminum)... 27
3 Effective October 24, 2013 Page 3 of 27 Pad Mounted Transformers Three Phase Padmounts Size (KVA) Impedance (%) (Ph-Ph) Sym Fault Current (Amps) , , , , , , , , , , , , , , ,523 Single Phase Padmounts Size (KVA) Impedance (%) Sym Fault Current (Amps) , , , , , , , , , , , ,792
4 Effective October 24, 2013 Page 4 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 1.4 Three Phase Bank (3-10 KVA) Service Length (Ft.) ,949 5, ,425 4, ,985 4, ,610 4, ,287 3, ,006 3, ,759 3, ,540 3, ,346 3, ,171 3, ,014 2, ,871 2, ,742 2,746 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,953 2, ,987 2, ,288 2, ,759 2, ,346 2, ,014 2, ,742 2, ,514 2, ,322 2, ,156 2, ,013 2, ,887 2, ,777 1,940
5 Effective October 24, 2013 Page 5 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 1.4 Three Phase Bank (3-15 KVA) Service Length (Ft.) ,922 7, ,986 7, ,190 6, ,516 6, ,943 5, ,454 5, ,033 4, ,669 4, ,351 4, ,072 4, ,825 3, ,605 3, ,408 3,526 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,928 4, ,193 4, ,944 3, ,034 3, ,351 3, ,824 3, ,407 3, ,070 3, ,793 3, ,560 2, ,363 2, ,194 2, ,047 2,618
6 Effective October 24, 2013 Page 6 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 1.4 Three Phase Bank (3-25 KVA) 0 14,865 12,883 6, ,472 11,279 6, ,612 9,947 6, ,175 8,851 5, ,052 7,947 5, ,158 7,196 5, ,434 6,565 5, ,837 6,029 5, ,339 5,571 4, ,917 5,174 4, ,555 4,829 4, ,242 4,525 4, ,968 4,257 4,426 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,876 7, ,615 6, ,052 6, ,433 5, ,337 5, ,553 4, ,967 4, ,512 4, ,150 4, ,855 3, ,610 3, ,404 3, ,227 3,216
7 Effective October 24, 2013 Page 7 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 1.4 Three Phase Bank ( KVA) 0 22,306 19,332 9, ,751 16,284 9, ,308 13,764 8, ,831 11,788 8, ,025 10,246 8, ,670 9,029 7, ,624 8,053 7, ,795 7,258 7, ,125 6,600 6, ,573 6,047 6, ,110 5,578 6, ,718 5,174 6, ,380 4,824 5,894 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,323 11, ,310 9, ,023 8, ,621 7, ,123 7, ,108 6, ,378 5, ,829 5, ,401 5, ,059 4, ,779 4, ,546 4, ,349 3,810
8 Effective October 24, 2013 Page 8 of KVA Overhead Transformer (#4/0 Aluminum Multiplex) %Z: 1.4 Three Phase Bank ( KVA) 0 22,306 19,332 9, ,477 17,452 9, ,113 15,802 9, ,170 14,372 8, ,573 13,140 8, ,250 12,077 8, ,145 11,156 8, ,211 10,354 8, ,415 9,651 7, ,728 9,032 7, ,132 8,484 7, ,609 7,995 7, ,148 7,557 7,186 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,323 11, ,119 10, ,574 9, ,144 9, ,413 8, ,130 8, ,146 7, ,370 7, ,743 6, ,227 6, ,795 6, ,428 5, ,113 5,572
9 Effective October 24, 2013 Page 9 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 2.0 Three Phase Bank (3-50 KVA) 0 20,813 18,038 9, ,716 15,293 8, ,613 13,031 8, ,350 11,241 7, ,679 9,830 7, ,411 8,705 7, ,424 7,795 7, ,637 7,049 6, ,997 6,427 6, ,467 5,903 6, ,022 5,455 6, ,642 5,069 5, ,316 4,733 5,621 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,828 10, ,615 9, ,677 8, ,422 7, ,995 6, ,020 6, ,313 5, ,780 5, ,363 4, ,028 4, ,753 4, ,524 3, ,330 3,711
10 Effective October 24, 2013 Page 10 of KVA Overhead Transformer (#4/0 Aluminum Multiplex) %Z: 2.0 Three Phase Bank (3-50 KVA) 0 20,813 18,038 9, ,275 16,351 8, ,154 14,872 8, ,400 13,587 8, ,948 12,474 8, ,737 11,508 7, ,718 10,667 7, ,851 9,930 7, ,108 9,281 7, ,464 8,707 7, ,902 8,196 7, ,408 7,739 6, ,970 7,329 6,794 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,828 10, ,160 9, ,950 9, ,717 8, ,106 8, ,900 7, ,968 7, ,229 6, ,628 6, ,132 6, ,715 5, ,360 5, ,055 5,359
11 Effective October 24, 2013 Page 11 of KVA Overhead Transformer (4 # 500 KCM Aluminum) %Z: 2.0 Three Phase Bank (3-50 KVA) 0 20,813 18,038 9, ,936 16,099 8, ,757 14,535 8, ,049 13,248 8, ,675 12,170 8, ,545 11,254 7, ,600 10,466 7, ,798 9,781 7, ,109 9,180 7, ,510 8,649 7, ,985 8,176 6, ,522 7,752 6, ,109 7,369 6,624
12 Effective October 24, 2013 Page 12 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 2.0 Three Phase Bank (3-75 KVA) 0 31,219 27,057 13, ,852 21,384 12, ,273 17,102 12, ,690 14,055 11, ,274 11,854 10, ,558 10,215 10, ,284 8,958 9, ,303 7,968 9, ,527 7,171 8, ,899 6,515 8, ,379 5,967 7, ,943 5,503 7, ,572 5,106 7,027 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,242 15, ,273 13, ,271 11, ,280 9, ,524 8, ,376 7, ,570 6, ,972 6, ,512 5, ,148 5, ,851 4, ,606 4, ,399 4,140
13 Effective October 24, 2013 Page 13 of KVA Overhead Transformer (#4/0 Aluminum Multiplex) %Z: 2.0 Three Phase Bank (3-75 KVA) 0 31,219 27,057 13, ,945 23,527 13, ,836 20,578 12, ,695 18,165 12, ,271 16,192 11, ,366 14,568 11, ,839 13,217 10, ,594 12,082 10, ,562 11,117 10, ,694 10,289 9, ,955 9,571 9, ,319 8,944 9, ,765 8,393 9,082 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,242 15, ,841 14, ,270 12, ,837 11, ,559 10, ,952 10, ,762 9, ,847 8, ,124 8, ,537 7, ,052 7, ,645 6, ,298 6,418
14 Effective October 24, 2013 Page 14 of KVA Overhead Transformer (4 # 500 KCM Aluminum) %Z: 2.0 Three Phase Bank (3-75 KVA) 0 31,219 27,057 13, ,153 22,907 12, ,060 19,861 12, ,113 17,529 11, ,889 15,688 11, ,152 14,197 11, ,757 12,964 10, ,612 11,929 10, ,656 11,046 9, ,845 10,285 9, ,149 9,623 9, ,545 9,040 9, ,016 8,524 8,765
15 Effective October 24, 2013 Page 15 of KVA Overhead Transformer (4 # 1000 KCM Aluminum) %Z: 2.0 Three Phase Bank (3-75 KVA) 0 31,219 27,057 13, ,250 22,980 12, ,176 19,957 12, ,225 17,630 11, ,992 15,785 11, ,244 14,288 11, ,839 13,048 10, ,685 12,006 10, ,722 11,117 9, ,904 10,351 9, ,203 9,683 9, ,594 9,095 9, ,060 8,575 8,815
16 Effective October 24, 2013 Page 16 of KVA Overhead Transformer (#1/0 Aluminum Multiplex) %Z: 2.5 Three Phase Bank (3-100 KVA) 0 33,299 28,859 14, ,667 23,099 13, ,466 18,384 12, ,480 14,982 12, ,823 12,537 11, ,957 10,733 10, ,586 9,361 10, ,539 8,290 9, ,716 7,432 9, ,053 6,731 8, ,508 6,149 8, ,052 5,659 7, ,665 5,239 7,491 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,323 16, ,465 14, ,819 12, ,582 10, ,713 9, ,505 8, ,663 7, ,042 6, ,567 5, ,192 5, ,887 4, ,636 4, ,425 4,291
17 Effective October 24, 2013 Page 17 of KVA Overhead Transformer (#4/0 Aluminum Multiplex) %Z: 2.5 Three Phase Bank (3-100 KVA) 0 33,299 28,859 14, ,892 25,275 13, ,433 22,117 13, ,963 19,471 13, ,279 17,290 12, ,177 15,491 12, ,501 13,998 11, ,142 12,748 11, ,022 11,689 11, ,085 10,785 10, ,290 10,005 10, ,609 9,326 10, ,020 8,730 9,736 Single Phase 1 Ph Sym Fault Current (Amps) Single Phase Service Length (Ft.) ,323 16, ,438 15, ,278 13, ,498 12, ,018 11, ,286 10, ,016 9, ,046 9, ,283 8, ,668 8, ,162 7, ,738 7, ,378 6,749
18 Effective October 24, 2013 Page 18 of KVA Overhead Transformer (4 # 500 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-100 KVA) 0 33,299 28,859 14, ,510 24,204 13, ,014 20,839 13, ,820 18,293 12, ,434 16,300 12, ,584 14,698 11, ,109 13,383 11, ,904 12,283 10, ,902 11,351 10, ,055 10,549 10, ,331 9,854 9, ,703 9,244 9, ,155 8,706 9,146 Single Phase 1 Ph Sym Fault Current (Amps) Service Length (Ft.) ,323 16, ,020 14, ,434 13, ,107 12, ,899 11, ,328 10, ,152 9, ,240 8, ,511 8, ,915 7, ,420 7, ,001 6, ,642 6,553
19 Effective October 24, 2013 Page 19 of KVA Overhead Transformer (4 # 1000 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-100 KVA) 0 33,299 28,859 14, ,508 24,203 13, ,015 20,838 13, ,822 18,293 12, ,437 16,302 12, ,589 14,701 11, ,114 13,386 11, ,909 12,287 10, ,908 11,355 10, ,061 10,554 10, ,337 9,859 9, ,710 9,249 9, ,161 8,711 9,147
20 Effective October 24, 2013 Page 20 of KVA Overhead Transformer (#4/0 Aluminum Multiplex) %Z: 2.5 Three Phase Bank (3-167 KVA) 0 55,623 48,206 24, ,878 38,973 22, ,118 31,611 21, ,643 26,195 20, ,203 22,204 19, ,019 19,197 18, ,640 16,871 17, ,804 15,029 16, ,346 13,539 15, ,163 12,311 15, ,184 11,283 14, ,362 10,411 13, ,661 9,662 13,097
21 Effective October 24, 2013 Page 21 of KVA Overhead Transformer (4 # 500 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-167 KVA) 0 55,623 48,206 24, ,007 36,528 22, ,006 29,383 20, ,372 24,568 19, ,517 21,105 18, ,713 18,496 17, ,582 16,461 16, ,909 14,828 15, ,560 13,490 14, ,450 12,373 14, ,519 11,427 13, ,729 10,615 12, ,049 9,911 12,284
22 Effective October 24, 2013 Page 22 of KVA Overhead Transformer (4 # 1000 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-167 KVA) 0 55,623 48,206 24, ,925 36,460 22, ,937 29,315 20, ,320 24,511 19, ,478 21,060 18, ,684 18,461 17, ,561 16,433 16, ,893 14,806 15, ,548 13,472 14, ,441 12,359 13, ,513 11,416 13, ,724 10,606 12, ,046 9,904 12,256
23 Effective October 24, 2013 Page 23 of KVA Overhead Transformer (4 x 2 # 1000 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-167 KVA) Service Length (Ft.) ,623 48, ,800 41, ,925 36, ,845 32, ,937 29, ,838 26, ,320 24, ,235 22, ,478 21, ,979 19, ,684 18, ,555 17, ,561 16,433
24 Effective October 24, 2013 Page 24 of KVA Overhead Transformer (4 x 3 # 1000 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-250 KVA) Service Length (Ft.) , , , , , , , , , , , , ,635
25 Effective October 24, 2013 Page 25 of KVA Overhead Transformer (4 # 1000 KCM Aluminum) %Z: 2.5 Three Phase Bank (3-250 KVA) Service Length (Ft.) , , , , , , , , , , , , ,746
26 Effective October 24, 2013 Page 26 of KVA Overhead Transformer (4 x 3 # 1000 KCM Aluminum) %Z: 3.0 Three Phase Bank (3-333 KVA) Service Length (Ft.) , , , , , , , , , , , , ,088
27 Effective October 24, 2013 Page 27 of KVA Overhead Transformer (4 x 3 # 1000 KCM Aluminum) %Z: 3.0 Three Phase Bank (1500 KVA) Service Length (Ft.) , , , , , , , , , , , , ,333
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