INSTALLING THE ACCESSIBLE TOILET ALARM SYSTEM
ALWAYS ENSURE MAINS SUPPLY IS ISOLATED BEFORE MAKING ANY CONNECTIONS.
See figure 1 for typical accessible toilet alarm wiring.
Mains wiring
All mains wiring should be provided in accordance with the current edition of the IEE
Wiring Regs. (BS 7671) and/or other national wiring rules.
The general requirement for the mains supply to the NC943B call controller is fixed wiring,
using three core cable of not less than 1mm
2
. This should be fed from an isolating switched
fused spur, fused at 3A, which is marked appropriately and secure from unauthorised
operation.
Live and neutral should be connected to the call controller’s L and N terminals respectively. If
a plastic back box is used, make the earth connection to the earth terminal at connector
block CONN2. If a metal back box is used, the earth connection must be made to the earth
bonding point on the back box.
Extra low voltage (ELV) wiring
Always segregate ELV wiring from mains wiring.
Three cores of four core stranded burglar alarm cable is ideal for ELV wiring on most
installations with all components requiring a positive, negative and signal connection
(except the ceiling pull which DOES NOT require a positive connection).
Note:
The running order of the overdoor light, ceiling pull and reset point can be changed
to suit a specific application and/or to reduce wiring runs.
All wall-mounting devices should be mounted onto a back box of 25mm depth. Assess the
condition and construction of all mounting surfaces prior to installation and use suitable
screw fixings.
Approved Document No.: DNU0951001 Rev 3 • Page 4 of 8
