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CONNECTING ALARM LOOPS

Any fire / intrusion detectors intended to be powered by a DC power supply can be included into the

Signal-10 alarm loops provided that fire detectors have the values of internal resistance at Fire mode

no more than 2.7 kΩ for normally open detectors and at least 3.2 kΩ for normally closed detectors.

An intrusion alarm loop must meet the following requirements:

− The wire resistance without regard to termination resistor must not exceed 1 kΩ

− The leakage resistance between loop wires or between each wire and the earth must be at

least 20 kΩ

A fire alarm loop must meet the following requirements:

− The wire resistance without regard to termination resistor must not exceed 100 Ω

− The leakage resistance between loop wires or between each wire and the earth must be at

least 50 kΩ

Following are some examples for including various detectors into alarm loops of different types.

Including Detectors into Fire Smoke Alarm Loops of the Type 1

loop+

loop-

Ra Ra

D1: A smoke detector

Ra: An additional resistance of 1.5 ÷ 2.4 kΩ

Rt: 4.7 kΩ

Figure 4. Detectors into a Fire Loop of the Type 1 Connecting Diagram

When all the detectors will be wired and connected to the relative Signal-10 contacts, test the loop.

Ensure that confirmed actuation of a single detector causes the loop to get the Fire Prealarm status,

while actuation of two ones causes the loop to get the Fire Alarm status. Light and sound indication of

the Signal-10 device must be in accordance with that described in Table 8. The network controller

must display the relative messages from the Signal-10 device (see Transmitting Messages to a Net-

work Controller section of this Manual).

Otherwise, if the test fails, the values of additional resistances have to be corrected.

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Bolid Signal-10 Manual de usuario Pagina 64