3
ELECTRICAL CONNECTIONS
20
OPTIWAVE X400
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10/2017 - 4006413501 - AD NEPSI OPTIWAVE x400 R01 en
3.4 Equipotential bonding system
Connect the device to the equipotential bonding system for the hazardous location.
You can use 2 terminals to connect the device to the equipotential bonding system:
•
a ground connection in the terminal compartment and
•
an external ground terminal adjacent to the cable entries
Make sure that the electrical connections agree with the applicable regulations (for more data,
refer to
General notes
on page 10). Use the ground terminal in the terminal compartment to
connect all electrical cable shields to ground.
Ground all remaining electrical wires in the hazardous location or make sure that they have good
insulation. Refer also to the sections that follow in this chapter.
Ex ia- and Ex iaD-approved devices
The device electronics are isolated with a rating of 500 V
RMS
.
Ex d ia- or Ex iaD tD-approved devices
The device does not agree with the 500 V
RMS
dielectric strength requirement. Obey all the
instructions given in the "Electrical connections" chapter.
3.5 Ex ia and Ex iaD equipment
3.5.1 How to connect the electrical cables
Refer to the handbook for data about the device terminals.
Cable glands are supplied on customer demand. If you supply the cable glands, this part must
have a degree of ingress protection IP
≥
6X (IEC 60529). We recommend that you use a part that
has a degree of ingress protection IP
≥
68. Make sure that the cable gland is sealed.
Obey the instructions that follow:
•
Electrical wires must agree with applicable standards (for more data, refer to
General notes
on page 10).
•
Use the electrical connection procedure in the Handbook.
•
Put the electrical wires in position and safely attach them to prevent damage. The electrical
wires must also be a sufficient distance from hot surfaces.
•
Make sure that unused electrical wires are safely connected to the ground potential of the
hazardous area. If this is not possible, make sure that each of the unused electrical wires are
safely isolated (other electrical wires, ground etc.) and rated for a test voltage
≥
500 V
RMS
.
•
If it is necessary, make sure the electrical wire insulation gives good protection from
corrosion.
•
Connect only to separate certified, intrinsically-safe circuits. Make sure that the electrical
circuit characteristics are not more than the values that follow.
