12 Monitored lines
Figure 16: Address element number and line lengths for a 0.6 diameter line
The sheath wire of the cable shield is to be laid at the clamps provided in the detectors and
devices. The cable is earthed at the corresponding clamps in the SIGMASYS control and in-
dicating panels. The unshielded wires and the sheath wire should be as short as possible to
avoid interference.
According to VdS 2095, the loop cable must be laid out as a real ring if the detector zone con-
tains more than 32 automatic or more than 10 non-automatic detectors, or if automatic and
non-automatic detectors are mixed. In other words, forward and reverse lines must be laid in
separate cables and separate lines.
A cable may only contain SIGMASYS monitored lines from a single
MPC module.
12.5 Load factors
Maximum current load in SIGMALOOP
The maximum number of loop elements which can be connected also depends on current
consumption levels. A load factor is also specified for each element
• Each SIGMALOOP BMT detector, including combined detector, transponder, indicator
panel module contact coupler or control module has a load factor of 1.
• The detector gateway has a load factor of 8 and there is an additional load factor of 0.5
for every detector
• Every activated detector output (detector parallel display or FSA) and every activated
detector display has a load factor of 1.
Maximum load factor:
SIGMALOOP 250
SIGMASPUR 100 A
load factor of 1 is equal to 250 µA
84 / 128 BMT Project Planning Guidelines
Best.Nr. A24205-A337-B970 – Edition 12 (03/07)
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