INSTALLATION INSTRUCTIONS
Hydrosense ID Addressable Water Detection System
Document Part No. 3500039 Issue:01
Page | 8 of 32
5. Cabling
It is advisable to fit cable glands and cables before re-fitting the outer cover and plate/circuit board assembly.
Cables should be brought into the cabinet using the knockouts provided and where necessary, using couplers to
maximise the space within the enclosure. Use the knockouts closest to the terminating position for each cable, to
ensure cable length within the enclosure is kept to a minimum.
Ensure that only the numbers of knockouts are removed to meet the cable termination requirements, as any
additional apertures in the enclosure will compromise the IP30 ingress protection requirements.
Brass inlet bushings or cable glands should be used to maintain insulation and to ensure EMC compliance.
The screen or drain wires should be bonded to earth via metal cable glands.
The maximum size of cable, which can be terminated, is 2.5
2
mm.
The communications protocols are highly immune to noise but sensible segregation from known noise generating
sources such as mains cables is recommended.
Detection loop circuit cable size and type is dependent on the number and type of devices used and should be
calculated for each installation.
Cabling for sounder circuits should be sized according to sounder load and cable length but 1.5mm
2
should suffice
in the majority of cases.
The control panel requires a 230 VAC supply, which should be derived from a separate fused mains isolator
switch, labelled “
Water Leak Alarm - Isolator
”.
The mains supply must include an earth conductor connected to the fixed installation earthing system of the
building.
This equipment relies on the building installation for protection and requires a 5 Amp protection device. The
mains supply should use cable with a minimum cross section of 1.5 mm
2
.
5.1. Cable Termination
Drain wires need to be terminated at the brass cable gland to ensure EMC compliance.
To ensure good earth bonding at entry to the panel enclosure, it is recommended that the cable drain wires are
terminated using Pirelli AXT brass cable glands. These glands have a slotted fixing thread, which allows the drain
wire to be clamped between the gland fixing nut and panel enclosure. To ensure that a good earth bonding
between the drain wire and panel case, a 20 mm shakeproof washer should be used, as shown in the termination
diagram below.
Drain wire clamped
between 20 mm
shakeproof washer and flat
washer, held in place with
fixing nut.
Pirelli AXT
Type brass
cable gland
Panel
enclosure
