Stahl 8118/1 Serie Betriebsanleitung Seite 43

Distances, creepage distances and clearances
 When installing components, the creepage distances and clearances between the
individual components, as well as between the components and the enclosure walls,
must be sufficiently dimensioned. Observe the values from the EN IEC 60079-7 standard
(table) when doing so.
 Check the creepage distances of the components and comply with them according to the
specifications in the respective operating instructions.
 The clearance distances, depending on the rated operational voltage of the fitted
terminals, must be complied with.
 Observe the distance between the enclosure cover and terminal screws of the built-in
components (with the conductor connected). It must be at least the value of the required
clearances.
Distance between the connecting units for intrinsically safe and non-intrinsically safe electric
circuits
 Mount partitions used to separate connection terminals at least 1.5 mm from the enclosure
walls, or alternatively ensure a minimum distance of 50 mm between the uncoated
conducting parts of the connection terminals (when measured in any direction around
the partition)
 Make sure that metallic partitions
• are at least 0.45 mm thick
• are earthed
• are sufficiently strong and rigid
• have sufficient current carrying capacity.
 Make sure that non-metallic, insulating partitions
• are at least 0.9 mm thick
• have the requisite comparative tracking index (CTI).
To find out what this should be, refer to standard IEC/EN 60079-7 and the information
on the voltage that occurs (see chapter "Technical data").
• are reinforced to prevent deformation.
 When using fuses > 4 A, implement additional design measures to prevent impermissible
heat-up at the terminals of the intrinsically safe circuits.
Covers for combinations of non-intrinsically safe and intrinsically safe circuits
 Equip all live parts which are not acc. to "Ex i" protection with an inner cover which meets
at least the degree of protection IP30 when the equipment is open.
Intrinsically safe circuits
 In intrinsically safe circuits, use only insulated cables and conductors with a test voltage
of at least 500 V AC and a minimum quality of H05.
 Calculate the insulation test voltage for the insulation and separation of terminals and
conductors from the sum of the rated operational voltages of intrinsically safe and
non-intrinsically safe circuits.
• In the case of "intrinsically safe to earth", there is a minimum rated insulation voltage
value of 500 V (otherwise, double the rated operational voltage of the intrinsically safe
electrical circuits).
• In the case of "intrinsically safe to non-intrinsically safe", there is a minimum rated
insulation voltage value of 1500 V (otherwise, double the rated operational voltage plus
1000 V).
133285 / 8118609300
2019-11-13·BA00·III·en·06
Mounting and Installation
Terminal Boxes
Series 8118/1, Series 8118/2
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