RS-422 SINGLE-POSITION JUNCTION BOX (J-BOX)
8000-2573-20, REV. H
INSTALLATION GUIDE
6 of 10
6. Run conduit and ac cable to box and clamp
conduit in place (Figure 7).
7. Reattach transformer chassis.
Figure 7. Conduit attachment
8. Wire ac line to TB1 and jumper primary taps of
transformer according to ac source (refer back
to Figure 6).
120Vac:
Place a jumper across taps 1 and 3,
and another jumper across taps 2 and 4.
240Vac: Place a jumper across taps 2 and 3
only.
9. Reattach PC board assembly.
Changing the Fuse
To reduce the risk of fire, replace fuses with the
same type and rating (3:15A type IEC127, sheet
III). The part number for the fuse is 5111-0017-21.
Two spare fuses are provided inside the cover.
To access fuse, use a small slotted screwdriver to
unscrew the cap of the fuse holder (Figure 7) and
lift out the fuse.
Connecting Power and
Data Cables
Note:
Incoming and outgoing video cables are
connected together within the box. No termination
exists for video cables within the J-box.
Power Cable Requirements
The low-voltage power cable runs between the J-
box and the camera dome. The length of this
cable depends on the ac line voltage. See Table 1
for cable lengths based on worst case low line
voltages for Japan (100Vac), North America
(120vac), and Europe (240vac).
Table 1. Cable length vs. line voltage
Worst Case
Line
Voltages
18AWG 16AWG 14AWG
90 Vac
(Japan)
30m (100ft) 50m (160ft)
80m (260ft)
102 Vac
(N. Amer.)
60m (200ft) 100m (320ft) 160m (520ft)
180 Vac
(Europe)
30m (100ft) 50m (160ft)
80m (260ft)
204 Vac
(Europe)
60m (200ft) 100m (320ft) 160m (520ft)
Data Cable Requirements
Wires within the data cable are organized in two
polarized 22AWG, shielded, twisted pairs. Up to
1km (3000ft) of data cable can be run from the
Host to the J-box, or from J-box to J-box (see
CAUTION below). For more information about the
RS-422 communication protocol and possible
cable network configurations, see
Communication
Protocols and Cable Networks
, 8000-2573-19.
CAUTION:
Data cable from the J-box to the dome
is limited by the length of the power cable. See
Table 1 above.
Note:
Power, data, and video cables can be
ordered separately or within a composite cable
ordered in various lengths. Plenum-rated cables
must be used in indoor ceilings used for
environmental air return (called “other air space” in
the National Electrical Code). Order parts through
your distribution network. If you order cable from
an outside source, wire colors may be different.
Conduit
Fuse holders
