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8.2
The capacitance and either the inductance or the inductance to resistance ratio (L/R) of
the hazardous area load connected must not exceed the following values:
GROUP
Hazardous Area Terminals 4 w.r.t. 3 (IS Power Jumper Link not Fitted)
IIC
IIB*
IIA
Hazardous Area Terminals 4 w.r.t. 3 (IS Power Jumper Link Fitted)
IIC
IIB*
IIA
Hazardous Area Terminals 4 w.r.t. 2 (IS Power Jumper Link not Fitted)
IIC
IIB*
IIA
Hazardous Area Terminals 4 w.r.t. 2 (IS Power Jumper Link Fitted)
IIC
IIB*
IIA
Hazardous Area Terminals 2 w.r.t. 3
IIC
IIB*
IIA
Hazardous Area Terminals 1 w.r.t. 2
IIC
IIB*
IIA
Hazardous Area Terminals 2 w.r.t. 3 (IS Power Jumper Link not Fitted)
IIC
IIB*
IIA
Hazardous Area Terminals 2 & 4 w.r.t. 3 (IS Power Jumper Link Fitted)
IIC
IIB*
IIA
* Group IIB parameters also applicable for associated apparatus [Ex ia Da] IIIC
Notes:
1) The above load parameters apply when one of the two conditions below is given:
- the total Li of the external circuit (excluding the cable) is < 1% of the Lo value or
- the total Ci of the external circuit (excluding the cable) is < 1% of the Co value.
2) The above parameters are reduced to 50% when both of the two conditions below are given:
- the total Li of the external circuit (excluding the cable) is ≥ 1% of the Lo value and
- the total Ci of the external circuit (excluding the cable) is ≥ 1% of the Co value.
The reduced capacitance of the external circuit (including cable) shall not be greater than
1μF for Groups IIB, IIA & I and 600nF for Group IIC.
The values of Lo and Co determined by this method shall not be exceeded by the sum of all
of the Li plus cable inductances in the circuit and the sum of all of the Ci plus cable
capacitances respectively.
INM MTL SUM5 Rev 1
Load Parameters
CAPACITANCE
(μF)
0.095
0.73
2.45
I
4.3
0.095
0.73
2.45
I
4.3
0.095
0.73
2.45
I
4.3
0.095
0.73
2.45
I
4.3
3.0
20.0
100
I
180
3.0
20.0
100
I
180
0.095
0.73
2.45
I
4.3
0.095
0.73
2.45
I
4.3
INDUCTANCE
(mH)
4.29
17.1
34.3
56.3
2.00
8.40
16.4
56.3
4.29
17.1
34.3
56.3
2.00
8.40
16.4
56.3
1000
1000
1000
1000
172.4
656.4
1000
1000
4.29
17.1
34.3
56.3
2.00
8.40
16.4
56.3
L/R RATIO
(μH/ohm)
58
235
471
774
39
157
315
517
58
235
471
774
39
157
315
517
109,401
437,606
875,213
1,435,897
1,015
4,063
8,126
13,333
58
235
471
774
39
157
315
517
29
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