Appendix A: System calculations
P/N 3101890-EN • REV 006 • ISS 21JUN18 173
Table 68: Maximum branch length with 1 to 5 GSA-UMs/GSA-MABs configured for two-wire smokes
etector
Module
addresses
Maximum allowable wire distance using non-twisted, non-shielded wire pairs
18 AWG 16 AWG 14 AWG
ft m ft m ft m
–25 0 6778 2066 10768 3282 17126 5220
–50 0 6131 1869 9741 2969 15492 4722
–75 0 5501 1677 8739 2664 13899 4236
–100 0 4885 1489 7760 2365 12342 3762
–125 0 4282 1305 6802 2073 10819 3298
1–25 5353 1632 8504 2592 13525 4122
–25 1–25 4720 1439 7498 2286 11926 3635
–50 1–25 4100 1250 6513 1985 10359 3157
–75 1–25 3491 1064 5546 1691 8821 2689
–100 1–25 2893 882 4597 1401 7311 2228
–125 1–25 2306 703 3663 1116 5826 1776
26–50 3776 1151 5999 1829 9542 2908
–25 26–50 3153 961 5009 1527 7966 2428
–50 26–50 2539 774 4034 1230 6416 1956
–75 26–50 1935 590 3075 937 4890 1491
–100 26–50 1340 409 2130 649 3387 1032
–125 26–50 754 230 1197 365 1905 581
51–75 2491 759 3957 1206 6293 1918
–25 51–75 1868 569 2967 904 4720 1439
–50 51–75 1254 382 1992 607 3168 966
–75 51–75 648 198 1030 314 1638 499
–100 51–75 50 15 80 24 126 39
–125 51–75
76–100 1386 422 2201 671 3501 1067
–25 76–100 760 232 1208 368 1921 586
–50 76–100 143 44 227 69 361 110
–75 76–100
–100 76–100
–125 76–100
101–125
–25 101–125
–50 101–125
–75 101–125
–100 101–125
–125 101–125