International Gas Detectors TOC-635, Installer'S Manual

Page: 23 / 68

Cable Sizing
The total number of devices that can be supported on a cable highway will be limited by the
reset fuse on the PCB, the cable length and size fitted and the power requirement for each
module. The controller reset fuse is set to 2A. The following table is intended as a guide to show
the number of devices that can be run taking into account the volt drop for differing cable sizes
before boosters need to be employed.
Length (M)
250
500
750
1000
Toxic
32
32
26
20
Pellistor MK6/7*
32
21
14
10
Pellistor MK3**
23
14
9
7
Booster Module Required For Increased Detector Nodes
Beyond Indicated Numbers
2
1.0mm Cable / 17AWG
Length (M)
250
500
750
1000
Toxic
32
32
32
30
Pellistor MK6/7*
32
30
21
16
Pellistor MK3**
25
20
14
11
Booster Module Required For Increased Detector Nodes
Beyond Indicated Numbers
2
1.5mm Cable / 15AWG
Length (M)
250
500
750
1000
Toxic
32
32
32
32
Pellistor MK6/7*
32
32
31
26
Pellistor MK3**
28
24
21
18
Booster Module Required For Increased Detector Nodes
Beyond Indicated Numbers
2
2.5mm Cable / 13AWG
* – Also Ann & Toxic & Relay – Also Ann & Toxic & Display – Also Ann & Beacon/Sounder
** – Also Ann & MK6/7 & Relay – Also Ann & MK6/7 & Display
NOTES: 1: Assumes PSU voltage is 26.5V2: Assumes all Annunciators are spaced evenly on cable3:
Assumes on other outputs or inputs are disabled on Annuciator4: Assumes voltage drop acrros Ann
L1 to L1 is less than 25mV5: Assumes voltage drop acrros Ann L2 to L2 is less than 25mV6: Ann with
T102A=0.6W, Ann with MK6/7=1.1W, Ann with MK3=1.6W