7
INM 9478-ET(G) Rev 1
9 .1 9 .1 Specific Conditions of Use (Special Conditions)
The following conditions relate to safe installation and/or use of the equipment.
i. When installed in a zone 2 environment, the apparatus must be housed in an
appropriately certified enclosure as defined in EN IEC 60079-0 & EN IEC 60079-7
with the minimum dimensions of 180mm (H) × 45 mm (W) × 145mm (D) and IP54
ii. The external combinations of capacitance and inductance have not been
assessed for spark Ignition. With reference to IEC 60079-11 CL 10.1.5.2, the
following Special Condition of Safe Use has been added:
The values of Co and Lo 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.
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) > 1% of the Lo and
- The total Ci of the external circuit (excluding the cable) > 1% of the Co.
Note: the reduced capacitance of the external circuit (including cable) shall not be
greater than 1uF for IIB and 600nF for IIC.
The Ethernet Isolator has the following safety parameters:
Non-IS Connections: Supply (CON1), LAN RJ45 (SK1, SK2)
Un
=
30
V
(SELV)
Um = 250 V
IS Connection: LAN RJ45 (SK3)
Uo =
5.88 V (or PoEx power supply Uo parameter when connected)
Io
=
2.18A (10/100) or 4.36A (Gigabit)
Po
=
0.83
W
Ci
=
0.48
µF
Li
=
0
The capacitance and either the inductance or the inductance to resistance ratio (L/R) of the
load connected to the output terminals must not exceed the following values:
10/100 Ethernet Ports
Group
Capacitance (μF)
Inductance (µH)
or
L/R Ratio (μH/Ohm)
IIC
43
7.5
11
IIB/III
1000
29.9
44
IIA
1000
59.9
89
I
1000
98.2
146
Gigabit 10/100/1000 Ethernet Ports
Group
Capacitance (μF)
Inductance (µH)
or
L/R Ratio (μH/Ohm)
IIB/III
1000
7.5
22
IIA
1000
15.0
44
I
1000
24.5
73
