Worksheet Method - GE EST iO64 Technical Reference Manual

Worksheet method

Use this worksheet to determine the maximum cable length of a
notification appliance circuit for a given number of appliances.
Use this worksheet only if all the appliances are regulated. That is,
they must have a minimum operating voltage of 16 V. For other
appliances, use the "Equation method."
NAC cable length
Total operating current [1]
Load factor (64 point panel)
Load factor (250/500 point panel)
Load voltage drop
Source voltage
Load voltage drop
Minimum voltage
Regulated appliance voltage
Voltage drop [2]
Total operating current
Maximum resistance
Wire resistance (Ω/ft) [3]
Maximum wire length
Maximum cable length
[1] Total of the maximum operating currents for all appliances as specified for FWR power. See the appliance installation
sheets for operating currents.
[2] This voltage drop is valid for regulated notification appliances only. For unregulated appliances, see "Equation method,"
later in this topic.
[3] Use the manufacturer's published wire resistance expressed in ohms per foot. For typical values, see Table 1, later in this
topic.
EST iO64 and iO500 Technical Reference Manual
NAC1 NAC2
×
0.20
0.24
=
20.4
−
=
− 16.0
=
÷
=
÷
=
÷
2
=
Appendix B: Worksheets
NAC3
0.20 0.20
0.24 0.24
20.4 20.4
16.0 16.0
2 2
NAC4
A
V/A
0.20
0.24
V
20.4 V
V
V
16.0 V
V
A
Ω
ft.
2
ft.
211