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APPENDIX: Max. number of loop powered ABHW-4BZ
audible bases in one loop
1. The max. number of loop powered ABHW-4BZ audible bases in one device
loop depends on the available load current for ABHW-4BZ audible bases. The
available load current for loop powered ABHW-4BZs (I) can be calculated by:
I = I
– I
max
d
In which, I
max
scenario with 50
devices loaded in the loop.
40
35
30
25
20
15
10
5
0
0
50
Figure 9: Max. number of loop powered ABHW-4BZ in high dBA
60
50
40
30
20
10
0
0
50
Figure 10: Max. number of loop powered ABHW-4BZ in low dBA
is the max load current in one loop under the worst case
Loop Powered ABHW-4BZ (High dBA)
100
150
Load Current (mA) for ABHW-4BZ
Loop Powered ABHW-4BZ (Low dBA)
100
150
Load Current (mA) for ABHW-4BZ
Ω cable resistance. I
is the total load current for the
d
200
250
200
250
12
audible base quantity
audible base quantity
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