Appendix A: System calculations
250 EST3X Technical Reference Manual
Analog addressable circuit wire length
Table 81 lists the maximum wire distances allowed for analog addressable
circuits.
Notes
• Maximum wire resistance cannot exceed 50 ohms.
• Maximum wire capacitance cannot exceed 0.05 microfarads.
Table 81: Maximum allowable wire distance for analog addressable circuits
Max loop
Capacitance
Twisted,
non-shielded
Twisted,
shielded
Non-twisted,
non-shielded
ft m ft m ft m
0.01 µF 4000 1219 1724 525 5000 1524
0.02 µF 8000 2438 3448 1051 10000 3048
0.03 µF 12000 3658 5172 1576 15000 4572
0.04 µF 16000 4877 6896 2102 20000 6096
0.05 µF 20000 6096 8620 2627 25000 7620
0.01 µF 2777 846 1219 372 5000 1524
0.02 µF 5555 1693 2439 743 10000 3048
0.03 µF 8333 2540 3658 1115 15000 4572
0.04 µF 11111 3387 4878 1487 20000 6096
0.05 µF 13888 4233 6097 1858 25000 7620
0.01 µF 2631 802 1190 363 5000 1524
0.02 µF 5263 1604 2380 725 10000 3048
0.03 µF 7894 2406 3571 1088 15000 4572
0.04 µF 10526 3208 4761 1451 20000 6096
0.05 µF 13157 4010 5952 1814 25000 7620
Cabinet battery
Use the following method to calculate the minimum ampere-hour capacity of a
battery required in order to operate a panel in the absence of AC power. Battery
calculations must be performed separately for each cabinet in the system.
Determine the total amount of current in milliamps required by all of the
components that derive power from the battery while the panel is in standby
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