ABB AK101 - Page 16

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…5 ELECTRICAL INSTALLATION
Fig. 5.2 AK104 System Diagram
Note 1 Apparatus which is unspecified except that it must not be supplied from nor contain in normal
or abnormal conditions a source of potential with respect to earth in excess of 250 volts r.m.s
or 250 volts d.c.
Note 2a The capacitance and either the inductance or the inductance to resistance (L/R) ratio of the
cable connected between the + and – terminals of the power supply Type 4234500/501 and
terminals 1 and 4 of a katharometer Type 0065XX must not exceed the following values:
Group
Capacitance
in μF
Inductance
in mH
L/R ratio
in μH/Ohm
IIC
IIB
IIA
7.63
113
999
0.05
0.14
0.37
22
88
177
or
Group
Capacitance
in μF
Inductance
in mH
L/R ratio
in μH/Ohm
IIC
IIB
IIA
40
999
999
0.37
1.37
3.25
79
316
632
or
Note 2c The capacitance and either the inductance or the inductance to resistance (L/R) ratio of the cable
connected between terminals 3 & 4 of
MTL 7755ac zener diode safety barrier and ter
minals
2 & 3 of a katharometer Type 0065XX, must not exceed the following values:
Note 3 The cable may be separate cables or may be installed as separate circuits within a type ‘A’ or a type ‘B’
multicore cable as defined in EN60079 - 14: 2014, 12.2.28 (latest edition) subject to the following:
a. Each circuit shall be individually screened within a type ‘A’ multicore cable.
b. The peak voltage of any other circuit within a type ‘B’ multicore cable must not exceed 60 volts.
Note 4 The installation must comply with national requirements
Note 5 The system must be marked with a durable label. The label should appear on or adjacent to the principal
item of electrical apparatus in the system or at the interface be
intrinsically safe circuits.
This marking shall include the word SYST or SYSTEM, e.g.
‘BAS SYSTEM No Ex 01E2044’ or ‘BAS No Ex 01E2044 SYST’
Note 6 A junction box, if used, must satisfy the requirements of Clauses 6.1 and 6.3.1 of EN60079:11 (latest edition).
Safe Area
If Required
Safe Area Apparatus
See Note 1
Zener Diode
Safety Barrier:
MTL 7755ac
CERT No BAS 01 ATEX 7217
IEC Ex BAS 04.0025
Hazardous Area
2
3
1
4
TB5
18
17
POWER SUPPLY
TYPE 4234 500/501
CERTIFIED [Ex ia Ga] IIC
(–20°C ≤ Ta ≤ +55°C)
CERTIFICATE No
BAS 01 ATEX 7041
-
+
2
1
3
RS1
–
+
4 –
1+
9
10
3 –
2+
KATHAROMETER
TYPE 0065XXX
CERTIFIED Ex ia IIC T4 Ga
CERTIFICATE No
BAS 01 ATEX 1042
(–20ºC ≤ Ta ≤ +55ºC)
See Note 1
Junction boxes (if required) see note 6.
Location: Hazardous or Safe Area
RV1
See Notes 2 & 3 for cable details
Display/Control Unit
Model 6553
CERTIFIED [Ex ia Ga] IIC
(–20ºC ≤ Ta ≤ +40ºC)
CERT No BAS 01 ATEX 7043
& IECEx BAS 04.0025
2a
2b
2c
I.S. Earth
Group
Capacitance
in μF
Inductance
in mH
L/R ratio
in μH/Ohm
IIC
IIB
IIA
38
999
999
0.40
1.20
3.20
75
225
600
or
Note 2b The capacitance and either the inductance or the inductance to resistance (L/R) ratio of the cables
connected between (a) terminals 17 & 18 of the gas monitor type 6553 and terminals 9 & 10
of a katharometer Type 0065XX.
(e.g. within the UK the standard EN60079-14: (latest edition) is used).