Honeywell temaline TK C21P Installation Manual page 12

When the cables go outdoor is mandatory to use shielded cables. The
cables' shielding must be connected to the respective ground
connectors (-V).
For internal wiring without shielded cables is recommended an
electrical environment where the cables are well separated, even at
short runs, especially to the power cables or external cables which
can be essentially subjected to interference or lighting.
Use 4-wire (or 5-wire, if the sensor is provided with input disable)
cables for the connections to the sensors. Make sure that the cables
correspond in size to the norms indicated in Table 4 (maximum voltage
drop on the cable = 0.1V):
Cable length(m) = 0.1V / (I[A] load x 2 x (res [Ohm/km] /1000))
I load max for each sensor = 100mA (400mA overall)
Type of cable
AWG
12
14
16
18
20
22
24
Page 8
mm2 ohm/Km 20 [mA]
3,3 5,7
2 8,8
1,3 14
0,9 21
0,6 34
0,35 52
0,2 85
Table 4. Sensor Cable Length
in relation to current absorbed by sensor
50 [mA] 100 [mA] 200 [mA] 500 [mA]
439 175
284 114
179 71
119 48
74 29
48 19
29 12
Length (m)
88 44
57 28
36 18
24 12
15 7
10 5
6 3
INSTALLATION
18
11
7
5
3
2
1