125 CommScope Way
Statesville, NC (USA) 28625
Tel +1-828-324-2200 or 800-982-1708
Fax: +1-828-431-9811
bimetals@commscope.com
www.commscope.com
Approximate Fusing Currents for 40% Copper Clad Steel
More than adequate current carrying capacity for grounding or lightning
arrest. Fusing currents calculated using well known and accepted formula:
_
I = C x A x 1 / √t
Approximate Fusing Current (A)
Where:
I
=
A =
t
=
C =
Time to fuse (seconds)
Fusing current in amperes
Conductor area in circular mils
Current duration in cycles
0.81 for 30% Copper Clad Steel conductors
0.91 for 40% Copper Clad Steel conductors
1.1 for Copper
Approximate Short Term Fusing Currents for 40% CCS (amps)
19 No.5 19 No.6
19 No.7
19 No.8
19 No.9
7 No.4
7 No.5
7 No.6
7 No.7
7 No.8
7 No.9
7 No.10
Solid No.2 Solid No.4 Solid No.6
40%40%40%
40%40% 40%40%40%
40%40%40%40%40%40%40%
Time
628,917498,762395,542
313,684248,767 292,171231,706183,754
145,726115,56891,651 72,683 66,365 41,73826,250
(sec)
CyclesCMILCMILCMIL
CMILCMIL CMILCMILCMIL
CMILCMILCMILCMILCMILCMILCMIL
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
6
12
18
24
30
36
42
48
54
60
120
330,426262,044207,814164,807130,700153,504121,736 96,54376,563 60,718 48,152 38,187 34,867 21,929 13,792
233,647
185,293
146,947
116,53692,419108,54386,08068,26654,13842,93434,04927,00224,65515,5069,752
165,213
131,022
103,907
82,40365,35076,75260,86848,27138,28130,35924,07619,09417,43410,9656,896
134,896
106,97984,84067,28253,35862,66849,69839,41331,25724,78819,65815,59014,235 8,953 5,630
116,82392,64773,47358,26846,20954,27243,04034,13327,06921,46717,02413,50112,328 7,753 4,876
104,49082,86665,71652,11641,33148,54238,49630,52924,21119,20115,22712,07611,026 6,935 4,361
95,38675,64659,99147,57637,73044,31335,14227,86922,10217,52813,90011,02410,065 6,330 3,981
88,31070,03455,54144,04634,93141,02632,53525,80220,46216,22812,86910,206 9,319 5,861 3,686
82,60765,51151,95341,20232,67538,37630,43424,13619,14115,18012,038 9,547 8,717 5,482 3,448
77,88261,76448,98238,84530,80636,18128,69322,75518,04614,31111,350 9,001 8,218 5,169 3,251
73,88658,59546,46936,85229,22534,32427,22121,58817,12013,57710,767 8,539 7,797 4,903 3,084
52,24541,43332,85826,05820,66524,27119,24815,26512,106 9,600 7,614 6,038 5,513 3,467 2,181
Approximate Short Term Fusing Currents for Copper (amps)
500 MCM
400 MCM
300 MCM 250 MCM 4/0 Strand 3/0 Strand 2/0 Strand 1/0 Strand Solid No. 1 Solid No. 2 Solid No. 4 Solid No. 6 Solid No. 8
Time
500,000400,000300,000
250,000211,563 167,779133,057105,52183,683 66,365 41,738 26,250 16,510
(sec)
CyclesCMILCMILCMIL
CMILCMIL CMILCMILCMIL
CMILCMILCMILCMILCMIL
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
6
12
18
24
30
36
42
48
54
60
120
317,543
254,034
190,526
158,771
134,361106,55584,50367,01553,14642,14826,50816,67110,485
224,537
179,629
134,722
112,26895,00775,34559,75347,38737,58029,80318,74411,788 7,414
158,771
127,01795,26379,38667,18053,27742,25133,50826,57321,07413,254 8,336 5,243
129,636
103,70977,78264,81854,85343,50134,49827,35921,69717,20710,822 6,806 4,281
112,26889,81567,36156,13447,50437,67329,87623,69318,79014,901 9,372 5,894 3,707
100,41680,33360,24950,20842,48933,69626,72221,19216,80613,328 8,382 5,272 3,316
91,66773,33355,00045,83338,78730,76024,39419,34615,34212,167 7,652 4,813 3,027
84,86767,89350,92042,43335,90928,47822,58417,91114,20411,264 7,084 4,456 2,802
79,38663,50947,63139,69333,59026,63921,12616,75413,28710,537 6,627 4,168 2,621
74,84659,87644,90737,42331,66925,11519,91815,79612,527 9,934 6,248 3,929 2,471
71,00556,80442,60335,50230,04423,82618,89514,98511,884 9,424 5,927 3,728 2,345
50,20840,16630,12525,10421,24416,84813,36110,5968,403 6,664 4,191 2,636 1,658
40% DSA Copper Clad Steel for Grounding Applications
The most economical choice is to replace dead soft annealed (DSA) copper with DSA copper clad steel for grounding
applications (down-pole and mats). Below are a few of the major advantages:
Life
Equivalent to copper in corrosion resistance
Fatigue Resistance Superior to annealed copper
Handling
Flexible and manageable like copper, yet more robust and durable than dead soft annealed copper
Mechanical
Higher mechanical strengths minimize physical damage during installation and service
Weight
Lighter than copper by 8.5% for equivalent sizes
Theft Resistance
Zero scrap value
125 CommScope Way
Statesville, NC (USA) 28625
Tel +1-828-324-2200 or
800-982-1708
Fax: +1-828-431-9811
bimetals@commscope.com
www.commscope.com
© 2012, CommScope Inc. All Right Reserved. • 01.12