Document: LT0273

MX4428 MXP Engineering / Technical Manual

 

Analog Loop Design Considerations

4.2.3STAR CONNECTION OF ANALOGUE LINES

It is not always necessary to connect addressable systems as loops, especially if an existing conventional detector system is being converted to addressable detectors. As the existing detector zone cables probably already terminate at the main panel, it is possible to connect these in a star connection to the MXP as shown in Figure 4.2.

The two line terminals should be joined together as shown in Figure 4.2. The total length of cable connected to the MXP should not exceed 2000m.

Because shorting the cable in one line will short out all the other lines connected to the same MXP, it is recommended that 5BI Isolator Bases be fitted at the start of each line and then placed every 20 - 40 devices along each line. (Refer to section 3.2.4 for the calculations to determine where the isolator bases must be positioned.) The cabling from the MXP to the initial Isolator Bases should be as short as possible. In fact 5BI Isolator bases without detectors can be used at the star junction point.

Note: The Star Connection is not recommended for new installations. A loop configuration should be used as it offers open circuit fault protection and with Isolator Bases, short circuit protection.

4.2.4SPURS

Both the loop topography described in section 4.2.2 and the star topography described in section 4.2.3 can have "spurs" attached. (Spurs on a spur for the star topography.)

Any such spur should be connected to the loop or its parent spur with an isolator base.

However spurs are not recommended for new installations as an open circuit will disconnect all detectors further away from the MXP than the open circuit, and a short circuit on a spur will disconnect the whole spur.

In any case, to comply with standards, all the detectors on a spur should be in the same zone.

Issue 1.5

24 March 2006

Page 4-5

Page 72 Page 74
Page 73
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Tyco MX4428 technical manual Star Connection of Analogue Lines, Spurs
Page 72 Page 74

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