Com Loop Cable Length - Panasonic MEW01 351 Planning Manual

Panasonic Electric Works Nordic AB
MEW01351 Rev: -
23
Planning Instructions Fire alarm system EBL512 G3, V1.1.x

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 30 and
Figure 31, 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 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.
2. Graph with no dots
Can be used when only the following units are used:
2370 / 4370
3312 / 4313 + (3304, 3308, 3316, 4300 or 4301)
3309
3333 / 3339
3361 NOTE! The monitored input 0 must not be used as a
zone line input (Z) with conventional detectors
(e.g. 4350 / 4352) and end-of-line capacitor
3364
3366
3377
3378 / 3379 + (3304, 3308, 3316, 4300 or 4301)
4380
4582
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.
145