System calculations
B.24 EST3 Installation and Service Manual
3. Continue by adding the actual alarm load and the distance
from the previous device for each device on the SAC bus.
4. If you successfully enter all devices with no error messages,
no further calculations are required. The panel supply will be
adequate and each device will receive sufficient voltage.
5. If an error message occurs, you have the following options:
Repeat the process using 14 AWG in step 1
Run a second power supply line
Divide the SAC bus and add a remote power supply
SAC bus wire length tables
Table B-9: SAC bus wire length for number of doors vs. current loads using 16 AWG wire
Load (mA)
Doors 70 100 150 200 250 300 350 400 450 500 550 600 650
1 4000 4000 2650 2000 1600 1300 1140 1000 885 800 720 665 616
2 3800 2660 1776 1300 1060 880 760 666 594 532 484 444 410
3 2850 1950 1320 990 780 660 570 498 444 399 363 333 306
4 2240 1600 1040 800 624 520 452 400 355 320 288 266 244
5 1875 1350 885 650 525 435 375 333 296 266 242 222 205
6 1620 1140 756 558 450 378 324 286 254 228 207 190 X
7 1400 980 665 497 392 329 285 250 222 199 X X X
8 1240 880 584 440 352 288 253 222 197 X X X X
9 1125 810 522 396 315 261 228 200 X X X X X
10 1030 730 480 360 290 240 207 X X X X X X
11 946 660 440 330 264 220 X X X X X X X
12 876 600 408 300 240 X X X X X X X X
13 806 559 377 273 X X X X X X X X X
14 756 518 350 X X X X X X X X X X
15 705 495 330 X X X X X X X X X X
16 672 464 304 X X X X X X X X X X
17 629 442 X X X X X X X X X X X
18 576 414 X X X X X X X X X X X
19 570 399 X X X X X X X X X X X
20 540 380 X X X X X X X X X X X
Note: All distance measurements given in feet. X means that the 3-PPS/M will not support these
devices at any distance.
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