Stahl 8146/1 Serie Mode D'emploi page 30

Mounting and Installation
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Connecting intrinsically safe and non-intrinsically safe electrical circuits
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US Distance provided by partitions
 Partition must be at least 1.5 mm/0.06 inch from the enclosure wall and installed in
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accordance with all directions. Alternatively, maintain a distance of at least
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50 mm/1.97 inch between the uncoated conductive parts of the connection terminals.
 Make sure that metallic partitions
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• are at least 0.45 mm/0.02 inch thick
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• are earthed
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• are sufficiently strong and rigid
• have sufficient current carrying capacity.
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 Make sure that non-metallic, insulating partitions
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• are at least 0.9 mm/0.04 inch thick
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• have an appropriate comparative tracking index (CTI)
• are reinforced to prevent deformation
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 When using fuses > 4 A, implement additional design measures to prevent impermissible
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heat-up at the terminals of the intrinsically safe circuits.
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Distance provided by coverings
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 All live components that are not designed with "Ex i" type of protection must be provided
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with an internal covering. For open equipment, these must correspond to at least IP30
degree of protection.
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Connecting intrinsically safe circuits
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 Use only insulated cables and conductors with a test voltage of at least 500 V AC and
a minimum quality of H05.
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Calculate the insulation test voltage as follows:
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 Determine the rated operational voltages for intrinsically safe and non-intrinsically safe
circuits.
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 Depending on the type of dissipation/insulation, select the following rated insulation
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voltage value:
• "Intrinsically safe to earth": At least 500 V or double the value of the rated
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operational voltage for intrinsically safe circuits.
• "Intrinsically safe to non-intrinsically safe": At least 1500 V or double the rated
operational voltage plus 1000 V.
Connecting intrinsically safe components (creepage distances and clearances)
 Maintain creepage distances and clearances that run between the conductive parts
of the connection terminals in intrinsically safe circuits to earthed or potential-free,
conductive parts. The distances must be at least equal to the distances specified in
Table 5 of ANSI/ISA/UL 60079-11; CSA C22.2 no. 60079-11.
 For separated, intrinsically safe electric circuits: Set up a safe distance between the
uncoated, conductive parts of external connections, which meets the following
requirements:
• Minimum 6 mm/0.24 inch between the separated, intrinsically safe circuits
• At least 3 mm/0.12 inch to earthed parts if a possible connection to earth has not been
considered in the safety analysis.
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Terminal Boxes
Series 8146/1, Series 8146/2
137216 / 8146626300
2021-01-08·IO00·III·en·09