Mains Wiring And Connection Details - C-TEC AVAC Installation And Maintenance Manual

MAINS WIRING & CONNECTION DETAILS
The general requirement for the mains supply to AVAC's power supply PCB is fixed wiring,
using three core cable (no less than 1mm
conductor system, fed from an isolating switched fused spur, fused at 3A. This should be
secure from unauthorised operation and be marked 'FIRE ALARM SYSTEM: DO NOT SWITCH
OFF'. The mains supply must be exclusive to the AVAC unit.
(As an alternative to a switched fused spur, a double pole isolating device may be used (see
diagram below) providing it meets the appropriate national wiring regulations).
MAIN
DISTRIBUTION
BOARD
DO NOT attempt to connect mains to the AVAC until you are fully conversant with the layout
and features of the power supply PCB, as described below.
The power supply PCB combines the functions of a mains to d.c. switched mode power supply
unit, battery charging unit and battery monitoring unit.
THE POWER SUPPLY PCB STORES VOLTAGES AT UP TO 400 Vd.c. AND MAY BE
LETHAL IF TOUCHED. DO NOT TOUCH THE PCB WHILST THE RED 'HAZARDOUS
VOLTAGES PRESENT' INDICATOR IS LIT.
The Power Supply PCB
PSU EARTH STRAPS
DO NOT operate AVAC without
its earth straps connected in
this exact configuration
(The PSU earth strap connects the
power supply PCB to the chassis earth
post which in turn is connected to the
base earth post).
HAZARDOUS VOLTAGES
PRESENT LIGHT
When lit red, hazardous voltages
are present on the components in
the hatched area of the PCB and
this charge is only bled away
after the mains supply has been
removed. When the red light
extinguishes, the charge has
leaked away to a safe level.
BATTERY LEAD
CONNECTOR
(battery leads are supplied in the
AVAC's accessory pack). See page 14
for battery position and connection
details.
AVAC Installation and Maintenance Manual • Approved Document No. DAU000040 Rev 6 • Page 13
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2 and no more than 2.5mm
3A
≥ 3mm
N L
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AVAC VOICE ALARM SYSTEM
2 ) or a suitable three
≥ 0.75mm
< 2.5mm
2 2
1mm 2 < 2.5mm 2
AVAC
Incoming Mains cable must be
segregated from other cables
and should only enter the
enclosure through one of the
knock-outs on the right side of
the enclosure. Good quality
cable glands must be fitted.
The incoming mains earth
wire MUST be connected to the
terminal marked
and not to the chassis or
base earth post.
If connecting stranded
mains cable (max 2.5mm
we recommend the use of
bootlace ferrules.
20 x 5 mm 1 A HRC Ceramic to
IEC 127 (EN60127 Part 2).
Do not use any other type or size
of fuse in this position.
BATTERY FUSE (F2)
20 x 5 mm 5 A F to IEC 127
(EN60127 Part 2).
Do not use any other type or size
of fuse in this position.
2 )