5Electrical Installation Installation & Commissioning Manual
18
5100607_CFD5000 T - CM2.2_Installation & Commissioning Manual_T_EN_2023_F
Max number of units on one loop
The max number of units on one loop depends on the type of units and cable.
Please refer to above and section System data, page 9.
NOTE!
Concerning the number of loop units in Ex areas, follow the guidelines in the control
drawing for the unit, or use the "Ex-Calculator" (Excel spreadsheet) to verify the
intrinsic safety.
NOTE!
Ex loop units are not allowed on redundant loops.
5.2.4 Loops
A loop may contain different types and different numbers of loop units. The
connection to the loop depends on the type of loop unit and the configuration of the
system. Some of the loop units are connected directly to the loop and some are
connected through address units.
The information about the electrical installation of each type of loop unit is
provided in its respective data sheet and/or connection drawing.
CAUTION!
Do not remove dust protection covers from the smoke detectors until all polluting
activities (such as construction work) are finished and the area has been cleaned.
NOTE!
•
Set the address switch on each loop unit before connecting them to the loop. If
an address unit is used, also set its ID switch. See Setting the address on loop
units, page 26 later in this chapter and also Address list and test report, page
79 and ID List, page 81.
Hint!
Further information about loops and cabling can be found in chapter Cabling and
Electrical Installation, page 13.
5.2.5 Cable types
NOTE!
It is strongly recommended to use halogen free cables for loop-lines and connections
to external systems.
5.2.6 Protective earthings
•
All metal casings of electrical equipment over 24 V are to be earthed to the
train body. When the earthing is done with cable conductors – yellow/green
4
conductors are to be used or last conductor wire of the cable covered along the
whole length with yellow/green hose. Yellow/green is used only for earthings.
•
A separate earthing conductor is connected to the earthing point on the external
enclosure of the equipment and on the train body by means of a screw
connection.
4) Always mark earthing wires following national rules and regulations
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