Up to 8 Ex-e terminal blocks may be mounted inside the connection box of the device. Because these terminal blocks are exclusively mounted during production, this option must be specified when ordering the product.
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The X12 terminal block cannot be used together with an optional hard disk !
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Both use the same mounting space.
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For devices with these optional terminal blocks, please note the following:
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Ex-e or I.S. circuits MUST NOT be connected at the same time on terminal block X12.
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When connecting cables please ensure that the cable insulation reaches right up to the terminal part.
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Labelling Ex-i circuits
If intrinsically safe circuits are connected to terminal X12, the terminal and these circuits must be marked clearly and uniquely in line with EN 60079-11. If a colour is used, this must be light blue.
Connection details of the Ex-i terminals
Intrinsically safe circuits with the following safe maximum values may be connected to terminal block X12:
U = 30 V
I = 5 A
Connection details of the Ex-e terminals
For the alternatively permitted connection of Ex-e circuits the maximum values of the first supplement apply:
•Maximum nominal voltage: |
275 V
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•Maximum nominal voltage: |
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(if the fixed bridge bar is used):
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175 V
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•Rated current: |
4 A
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•Maximum on-load current: |
5 A
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Cable types and cross sections
•flexible mm² (AWG) |
0.2 – 1.5 (24 – 16)
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•rigid mm² (AWG) |
0.2 – 1.5 (24 – 16)
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Which cable cross sections are chosen should be decided on the basis of relevant regulations, such as DIN VDE 0298. Factors that might require a larger cross section, such as current, increased temperatures, cable bundling, etc. must also be taken into account. Factors that might require a larger cross section, such as current, increased temperatures, cable bundling, etc. must also be taken into account.
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