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5 ELECTRICAL INSTALLATION
5.1 Electrical Interconnections
Warning.
• Equipment in this system operates on a.c. mains supply
voltage electricity. Suitable safety precautions must be
taken to avoid the possibility of electric shock.
• Although certain instruments are fitted with internal
fuse protection, a suitably rated external protection
device, e.g. a 3A fuse or miniature circuit breaker
(m.c.b.), must also be fitted by the installer.
• The proper electrical connections and wiring standards
must be achieved to establish the intrinsic safety of the
system, as certified.
• The a.c. input and intrinsically safe d.c. output wiring must
be routed separately from non-intrinsically safe wiring.
Fig. 5.4 shows the interconnecting wiring requirements for the
gas analyser system, which must be strictly observed. Details
of cable requirements, which must be strictly adhered to, are
also given – see Section 5.2.1.
After completing the wiring, check that the continuity earthing
(grounding) and isolation of all circuits is to the required local
electrical standards for intrinsically safe circuits.
The separate units of the analyzer system must be
interconnected as follows:
Zero adjustment
for remote
katharometers
Clamp
brackets
Fuses
Upper display
3-way mains
supply terminal
block
Lower display
3-way mains
supply terminal
block
Fig. 5.1 Location of Components Inside Case (Rear View) – Model 6553 Gas Monitor Unit with Digital Displays
TB1
1
TB3
Upper display
Safety earth
terminal (TS1)
Lower display
Terminal block
for power and signal
conventional circuits
5 ELECTRICAL INSTALLATION...
5.1.1
Model 6553 Gas Monitor – Fig. 5.1
Warning. No connections must be made to the
hazardous area terminals (Terminal Block 2) other than
as specified in wiring diagram Fig. 5.3. The appropriate
cable requirements must be also satisfied.
Remove the outer case from the back of the unit to gain access
to the cable glands and terminal blocks.
The electrical connections are made through the appropriate
cable gland at the bottom of the unit into the terminal block
immediately above them. There are separate cable glands for
wires to the hazardous and safe areas – see Fig. 5.1.
The alarm and signal outputs on terminal block 1 (TB 1),
between TB1 - 1 and TB1 - 16, may be connected as required.
The availability of signal outputs vary with the particular 6553
system. Refer to Fig. 5.3 for details.
Make the wiring connections in accordance with the
information given in the wiring diagram Fig. 5.3 and Section
5.1.
Area for
Barriers
TB2
16
32
17
Terminal block (TB2)
for katharometer
intrinsically safe circuits
Type : 4689
top display unit
Selector
Switches
Type : 4689
bottom display
unit
Zener barriers
11
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