Panasonic Eco Solutions Nordic AB
MEW01472
Rev: -
Planning Instructions Fire alarm system EBL512 G3, United version 2.7.x
145
24
COM loop cable length
The cable length and max. COM loop current, are depending on the
number and type of loop units and the cable type, see Figure 32 and
Figure 33, page 146 and 147 respectively.
One
of the graphs in each figure has to be used depending on which
type of units that are connected to the COM loop. Start checking the
terms below for Graph 1 and Graph 2.
1. Graph with circular dots
.
Has to be used when at least one 2335 or 3361 unit with the monitored
input 0 used as a zone line input (Z) is used with conventional
detectors (e.g. 4350 / 4352) and end-of-line capacitor.
NOTE!
No "old" conventional smoke detectors of type
231x/2321 (i.e. requiring > 15 V) must be used.
Has to be used for the analog smoke detectors 2300 and 2304.
2. Graph with no dots
Shall normally be used, i.e. if the graph 1 (see above) not has to be
used.
The following two figures are showing graphs for maximum
conductor (wire) resistance and maximum cable length respectively.
Excel sheet
An Excel sheet is available for an easy check of the current
consumption, cable length, etc.
