C-TEC NC951 Installation Instructions

N C 9 5 1 • D E S I G N & I N S T A L L A T I O N G U I D E

+

­1
2
3
4

I

ndicators will operate:

Intermittently when help is on the way

R

REESSEETT

Indicators will operate:

C

ontinuously when pull cord is activated

Intermittently when help is on the way

On Calling

Call Accept

Accessible Toilet Alarm

This equipment must be installed and maintained by a suitably skilled and technically
competent person.

This document provides a brief design and installation overview of the NC951 accessible
toilet alarm system, based on the recommendations of BS 8300 (the code of practice for the
design of buildings and their approaches to meet the needs of disabled people).

NC951 KIT CONTENTS

NC809DBBT Accessible Toilet Reset Point c/w Sounder

Includes a ‘Reset’ button c/w braille text, red

reassurance LED and sounder.

Includes a red reassurance LED, red pull cord

NC807C Ceiling Pull

and two triangular pull bangles.

Accessory Pack

Containing device

mounting screws

and shorting link.

NC943B Single Zone Call Controller c/w Sounder

NC806CS Overdoor Light c/w Sounder

Includes a link selectable ‘Call Accept’/’Reset’
button, ‘Calling’ and power ‘On’ LEDs, 140mA PSU,
backup battery, volt-free relay output and sounder.

Single Zone Emergency Assistance Alarm

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Approved Document No.: DNU0951001 Rev 3 • Page 1 of 8

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NC949 Accessible WC

Sticker

Documentation

A Design & Installation
Guide (this document).

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g

-Ve SIG +Ve

1 -Ve +Ve

Spr Sig -Ve Sig -Ve +Ve

NC C NO

NEGATIVE

SIGNAL

POSITIVE

F

U

S

E

L

N

CONN2

R

REESSEETT

Indicators will operate:

Continuously when pull cord is activated

Intermittently when help is on the way

On Calling

Call Accept

AcceptReset

PLK1

Selectable Link

Mains Connector

pull’s signal (Sig)

DO NOT connect

+Ve to the ceiling

damage the device.

terminal as this WILL

NC809DBBT

Point c/w sounder

single gang back box)

(mounts on a 25mm UK

Accessible Toilet Reset

Three cores of four core

stranded burglar alarm cable

NC807C

conduit and

Ceiling Pull

BESA centres

Base fits 16mm

(surface mounting)

and a wheelchair.

TYPICAL LOCATION

Inside the WC so it is

Position 750-1200mm

above floor level and at

reachable from the toilet

Alongside the WC.

TYPICAL LOCATION

least 350mm from corners.

triangle 100mm

Set upper triangle

above floor level.

800-1000mm above

floor level. Set lower

NC806CS

(mounts on a

c/w Sounder

gang back box)

Outside the WC

25mm UK single

Overdoor Light

above the door.

TYPICAL LOCATION

be earthed.

NC943B

QUICK START INSTALLATION GUIDE

Figure 1 below, summarises key information provided in this document. For experienced installers, this should be all you need to get started.

If in doubt, or if using this equipment for the first time, read the full document.

Figure 1 : Typical NC951 Accessible Toilet Alarm Wiring

Volt-free

T&E

2

relay contacts

1mm

230Va.c. from

c/w Sounder

Single Zone Call Controller

(mounts on a 25mm UK double

fused spur

3A switched

(not supplied)

staffed area.

gang back box)

TYPICAL LOCATION

i.e. metal back box, MUST

However, any metal parts used during installation,

The call controller is a piece of Class 2 equipment.

Outside the WC in a remote

Approved Document No.: DNU0951001 Rev 3 • Page 2 of 8

DESIGNING AN ACCESSIBLE TOILET ALARM SYSTEM

W

C

Indicators will operate:

Continuously when pull cord is activated

Figure 2 below, shows a typical ‘good practice’ layout for an accessible toilet alarm system
based on the recommendations of BS 8300. Always refer to the full version of BS 8300 before
system design/installation.

Figure 2 : Typical BS 8300 Compliant Accessible Toilet Alarm System

Site the ceiling pull so its pull

ord can be operated from the

c
WC and adjacent floor area.

S

et

t

he upper

t

r

iangle bet
800m
abov

m

- 1000m

e f

loor

w

lev

een

m

el.

Set the lower
triangle exactly
100mm above
floor level.

ite the overdoor light outside

S
the WC above the door.

Site the call controller
outside the WC in a
remote staffed area.

Site the reset point so it is reachable
from both the WC and a wheelchair.
Position 750mm - 1200mm above floor
level, at least 350mm from the corners.

4 core

security cable

2

T&E

1mm

230Va.c.

3A switched

fused spur.

Approved Document No.: DNU0951001 Rev 3 • Page 3 of 8

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 1mm2. 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

ENGINEER SELECTABLE FUNCTIONS

L

N

Volume

+VE

SIGNAL

-VE

NO

C

NC

DO NOT

REMOVE

(BATTERY BACKUP

COVER)

Fit to
Enable
battery

PLK2

CONN3

CONN2

VR1

RLY1

A

cceptReset

PLK1

Reset

Accept

PLK1

Reset

Accept

PLK1

Reset

(no link fitted)

Accept

PLK1

NO

C

NC

CONN3

The NC943B call controller has a number of engineer selectable functions (see figure 3 below).
This section explains how these functions work and how to set them.

Figure 3 : Rear View of the NC943B Call Controller

‘Call Accept’ button
operation (link PLK1)

Link PLK1 (supplied) allows the
call controller’s ‘Call Accept’
button to be set up as follows
when an alarm signal is raised:

(a) Accept the call

In this factory-fitted position, pressing the ‘Call Accept’ button will send a slow
pulsing signal to the overdoor light and reset point. All sounders and LEDs will
remain active until the reset point’s ‘RESET’ button is pressed.

(b) Reset the system

In this position, pressing the ‘Call Accept’ button will cancel the alarm and
return the system to its normal state.

(c) Have no effect

With no link fitted, pressing the ‘Call Accept’ button signal will have no effect.

Note: It is recommended the call controller’s button is set up to ‘Call Accept’
operation, which is the factory setting. ‘Reset’ and ‘no effect’ operations are
outside the scope of BS 8300 and therefore not recommended for use in
accessible toilet alarm installations. However, they may be suitable for use in
other applications subject to the approval of the responsible person(s).

Volt-free relay operation (RLY1)

The call controller includes an on-board volt-free relay with contacts rated
30Vd.c. @ 1A. This relay can be used to switch optional externally powered
devices such as sounders, strobes, or the extra low voltage coils of mains
controlling relays.

When no calls are on the system, the normally closed contact is made. When an alarm signal
is present, the relay switches and the normally open contact is made.

Approved Document No.: DNU0951001 Rev 3 • Page 5 of 8

Battery backup enable/disable (link PLK2)

Fit to

Enable

b

attery

PLK2

SIG

1 -Ve +Ve

NC C NO

NEGATIVE

SIGNAL

POSITIVE

Volt free relay

contacts

Sig -Ve +Ve

Sig

Sig

S -V +V

1 -Ve +Ve

-Ve +Ve

-Ve

-Ve

Intermittently when help is on the way

R

REESSEETT

Indicators will operate:

Continuously when pull cord is activated
Intermittently when help is on the way

On Calling

Call Accept

F
U
S
E

Call

ALERT

RESET

Volume

VR1

Link PLK2 (supplied) enables or disables the call controller’s battery backup
facility. When enabled (link PLK2 fitted), the battery backup supply will
continue to power the system for approximately 24 hours (standby) plus 15
minutes (alarm running time) in the event of a mains failure. This will be
indicated by the call controller’s power ‘On’ LED flashing green.

Should the mains supply remain disconnected for a prolonged period of time, the battery
backup facility will automatically shutdown to prevent the batteries from deep discharge.

Note: PLK2 is not fitted in the call controller when dispatched. This is to conserve battery life
and ensure the safety of the call controller during storage/transit.

Volume control (potentiometer VR1)

Turn VR1 clockwise to increase (or anti-clockwise to decrease) the volume of
the call controller’s on-board sounder.

Sounder and LED test facility

With no calls on the system, pressing the call controller’s ‘Call Accept’ button with link PLK1
fitted in the Reset (b) position will cause all of the system’s sounders and LEDs (apart from
the ceiling pull’s LED) to activate. When the button is released, the LEDs and sounders will
switch off. The same test can be carried out by pressing the reset point’s ‘RESET’ button.

EXPANDING THE SYSTEM WITH OPTIONAL EMERGENCY CALL LEVEL

Up to three additional 800 Series devices (any device mix) can be connected to the NC943B
call controller. A typical expanded system is shown in figure 4 below. Should you wish to
connect more than three additional devices, consider using an NC941 single zone call
controller which is designed for powering larger call systems.

If required, the call controller can be used to generate a more urgent level of call. One
compatible device is the NC804DE emergency call point (shown below). This device is typically
used to allow the person attending the call to request additional assistance. When an
emergency call is triggered, any active or accepted alarm calls will be overridden. The call
controller’s red ‘Calling’ LED will flash, its sounder (and relay) will pulse and the overdoor
light will also pulse.

Figure 4 : Typical Expanded NC951 System with Emergency Call

/

2

1mm

T&E

NC943B

NC806CS

Approved Document No.: DNU0951001 Rev 3 • Page 6 of 8

NC807C

NC809DBBT

NC806CS

NC804DE

NC807C

BASIC OPERATION

The distressed person raises
an alarm call by pulling the
cord on the ceiling pull.

The overdoor light activates to visually
and audibly guide people to the area
where assistance is required.

The call controller’s red ‘Calling’ LED and sounder
activate steady to let staff know someone inside
the WC requires assistance.

Inside the WC

The ceiling pull’s red LED activates steady, the reset point’s
red LED and sounder activate steady to confirm an alarm call
has been raised.

Outside the WC

A member of staff accepts the
alarm call by pressing the call
controller’s ‘Call Accept’ button.

Outside the WC

Once assistance has been provided,
the call is cancelled by pressing the
reset point’s ‘RESET’ button.
The system returns to normal.

The ceiling pull’s red LED activates steady,
the reset point’s red LED and sounder activate
intermittently to confirm help is on the way.

Inside the WC

The default operation of the NC951 is shown in the diagrams below.

Raising an alarm call

Note: The call controller’s on-board relay will also activate when an alarm call is made and

any external equipment connected to the relay contacts will operate as configured.

Accepting an alarm call and resetting the system

Approved Document No.: DNU0951001 Rev 3 • Page 7 of 8

Note: Instead of accepting an alarm call,
a selectable link inside the call controller
also allows its button operation to be set
up to reset the system, or have no effect.
Refer to ‘Engineer Selectable Functions’
section of this document for details.

TECHNICAL SPECIFICATIONS

NC943B Single Zone Call Controller c/w Sounder

Mains supply: Voltage: 230Va.c. 50/60Hz; Max. current: 23mA.
Outputs: PSU voltage 12Vd.c. / current 140mA.

Currents: Zone current 18mA; Alarm current 23mA.
Battery backup: 500mA, rechargeable, 24 hours standby plus 15 minutes alarm run time.
Indicators: Red alarm ‘Calling’ LED; Green power ‘On’ LED (flashes green when

Sounder: Active in alarm, volume adjustable.
Controls: ‘Call Accept’ button (link selectable for accept, reset, or no function).
IP Rating: IP31 when correctly installed.
Mounting: Mounts on 25mm UK double gang back box (flush or surface).
Dimensions: 147 x 87 x 39mm (W x H x D).
Weight: 300g
Operating Temp.: -5oC to +40oC; Max. relative humidity (RH) 95% non-condensing.

NC807C Ceiling Pull Unit

Input: Voltage: 12Vd.c.; Connections: Signal and -Ve.
Pull cord: 3 metres cord length, generates an alarm call when activated.
Indicator: Red reassurance LED, active in alarm.
IP Rating: IP41 when correctly installed.
Mounting: Surface mountable.
Dimensions: 93mm diameter x 27mm deep.

NC806CS Overdoor Light c/w Sounder

Input: Voltage: 12Vd.c.; Connections: Signal, -Ve and +Ve.
Indicators: Dual ultra-bright red LEDs, active in alarm.
Sounder: Active in alarm.
IP Rating: IP41 when correctly installed.
Mounting: Mounts on 25mm UK single gang back box.
Dimensions: 87 x 87 x 68mm (W x H x D).

Volt-free relay contacts (NO/C/NC) rated 30Vd.c. @ 1A.

battery backup is active).

NC809DBBT Accessible Toilet Reset Point c/w Sounder

Input: Voltage: 12Vd.c.; Connections: Signal, -Ve and +Ve.
Indicator: Red reassurance LED, active in alarm.
Sounder: Active in alarm.
IP Rating: IP41 when correctly installed.
Mounting: Mounts on 25mm UK single gang back box.
Dimensions: 87 x 87 x 24mm (W x H x D).

E&OE. We reserve the right to alter product specifications at our discretion and without prior notice. This
document has been carefully checked prior to publication. However, no responsibility can be accepted by
the manufacturer or distributors of this equipment for any misinterpretation of an instruction or
guidance note or for the compliance of the system as a whole.

Approved Document No.: DNU0951001 Rev 3 • Page 8 of 8