CPC 809-1060 Manual de instalação e operação - Página 8
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L D
S
Leak
Detector
SYsfem
Manual
3. SENSOR CONNECTIONS
O
A.
DISTANCE AND CABLE SIZE
Each sensor
assembly
is to be
connected
four-conductor-plus-shield-cable. The cable may
be
longer lengths require larger guage
cable.
to
the
control
unit bY
a
almost any practical length,
but
300 feet
500 feet
750 feet
1250 feet
2000 feet
Conductor
Maximum
24 AWG
22 AWG
20 AWG
18 AWG
16 AWG
There is no minimum length
limit
for any cable guage'
O
B. WIRE COLORS AND SHIELD
It is
recommended that
the cable
have white, black, red, and green insulation
on
its
Conductors,
plus
a
foil
shield
with
a
separate drain
wire
for the
shield.
Stranded
conductors'(ihcluding the drain wire) will bb easier
to
handle
and less
likely
to
break
in
most installations.
The white wire and the shield drain wire should be connected together at
the
control
box end. The shield drain wire may be left disconnected at the sensor end.
The proper order of the wires is marked on the board in the back of the control unit
at
the tbrniinal blocks for the sensors. Each sensor connects
to a
separate terminal block,
sensor
1
to TB1, sensor
2toTB2,
etc. See Fig.
1.
Each terminal
block may be unplugged without removing wires from it if desired. lt
will
also fit through a hole in-the bottom of the enclosure while wires are attached
to
it.
Any splices in the sensor cable should be well insulated, kept dry,.and should connect
all
ioui
colored conductors and also the shield drain wires together between cable
ends.
A splice is an unshielded section of the
overall cable,
so should be located away.from
othbr electrical conductors.
lf
the splice must be close to other conductors,.locate
it..in
a
separate grounded metal box with hothing else
r1
it (except.other sensor cables {splices
or'cable just passing through) to the same L
D S
control
unit).
-3-