Installation
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2019-08-07·BA00·III·en·05
Terminal Box Ex d
8252/1
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In the case of "intrinsically safe to earth", the minimum insulation voltage is 500 V
(otherwise double the rated operational voltage of intrinsically safe circuits). In the case
of "intrinsically safe to non-intrinsically safe", the minimum insulation voltage is 1500 V
(otherwise double the rated operational voltage plus 1000 V).
Clearance and creepage distances of intrinsically safe components
The clearance and creepage distances between the blank, conductive parts of
connection terminals of separated, intrinsically safe circuits to earthed or potential-free,
conductive parts must be equal or greater than the values of IEC/EN 60079-11, Table 5.
If separated, intrinsically safe circuits have to be considered, the safety distance between
the blank, conductive parts of the outer connections must be as follows:
- minimum 6 mm between the separated, intrinsically safe circuits
- minimum 3 mm to the earthed parts, if a possible connection to earth has not been
considered in the safety analysis
11
Installation
11.1 Remove / Tighten the Enclosure Cover
Enclosure cover
Unscrewing the enclosure cover
- Carefully unscrew the enclosure cover and put it aside.
Screwing down the enclosure cover
- To prevent corrosion, the cover thread must be coated with acid-free grease
(Molykote BR 2 Plus, see chapter "Accessories and Spare Parts").
- Screw enclosure cover carefully onto lower enclosure part (do not tilt the thread).
- Screw in thread all the way.
11.2 Protective Conductor Connection
- Regardless of the operating voltage, connect all uncoated non-energized metal parts
to the protective conductor system.
- For information on potential equalization (PA), potential earth (PE) and intrinsically
safe circuits, please refer to the documentation of the associated equipment.
WARNING
If components are damaged or installed incorrectly, explosion
protection is no longer guaranteed!
Use the device only if it is undamaged.
If the thread is damaged, the device must be replaced immediately.
The permitted ambient temperature at the built-in intrinsically safe devices
and components must not be exceeded.
WARNING
Always connect the protective conductor!
The device is equipped with an internal and external protective conductor
connection.
Summary of Contents for 8252/1
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