System Design Guidelines - Cooper CF2000 Installation Manual

System Design Guidelines

Guidelines
Systems should to the relevant local standards and codes of practice, for the UK this is
BS5839 part 1. CF2000 meets all the relevant requirements of BS5839 part 1: 2002.
Installation planning is simplified by the fact that every addressable CF2000 device contains an
integral short circuit isolator. Care must be taken to ensure that local standards requirements
regarding aspects such as loop coverage, area covered by a single spur and cable
specification are observed.
There may be certain applications in which deviations from the code may be necessary and
these must be listed on the commissioning certificate. (See commissioning section)
Loop lengths
The maximum permitted loop length is 2 km measured from the near to the far terminals on the
CF2000 Motherboard PCB. There is no minimum limit to loop length. Any wiring spurs off the
loop must be included within the 2 km limit. On long loop runs, the lengths of wiring rises and
falls (between floors, down to manual call points) must be included. Remember to include
these especially when taking loop lengths from plan drawings.
Loop loading - total number of addresses
The total number of addresses per loop is 200 (99 Belgium). this includes detectors, call points
and all other addressable items and call points. When designing systems its recommended
that allowances are made for future expansion, Short circuit isolators are incorporated into
every CF2000 loop device, including Smoke detectors, heat detectors, sounders, callpoints
and interfaces. Therefore, no further fault protection is required , in the event of a single fault,
none of the devices connected to the loop will fail to operate as the fault will be isolated by the
two adjacent devices.
Spur connected devices downstream of a cable fault will cease to function.
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