6 Safety Instructions Safety Manual / Explosion Protection Manual
56926BA26, Rev. 06, 04/2019
6.3 Connection Compartment
Screw Connections
If it cannot be excluded that the cable gland might have suffered damage (e.g.
by a mechanical shock), then the cable gland and in particular the threads
should be checked for damage and replaced if necessary.
• Non-metallic screw connections may only be used for the temperature range of
-20 °C ≤ T
a
≤ +60 °C.
• For ambient temperatures of -20 °C ≤ T
a
≤ +60 °C, only such screw connections
should be permitted that at least technically meet the standard level listed on
the cover page of LB 4700 EC-type examination certificate. For outside of this
temperature range, only use screw connections that are approved by Berthold
Technologies GmbH & Co. KG.
• Screw connections must have at least degree of protection IP66 / IP68.
• Only use screw connections that are suitable for the cable type (armoured, non
armoured, ...) and the cable cross section.
• When using adapters for thread adjustment (e.g. thread reduction), only one
adapter may be used in any entry.
• Only replace screw connections with those of the same type.
Connecting Terminals
• Permissible max. conductor cross section: 2.5 mm
2
(AWG 21 - 14 flexible or rigid).
• Both fine stranded conductors and rigid conductors are allowed.
• Lay the connecting cables in the connection compartment so that
o no dirt and humidity gets into the connection compartment.
o the conductors are not damaged when the cable insulation is removed.
o the distances between bare conductors comply with the clearance and creep-
age distances.
o the conductors are placed U-shape around the screw of the connection ter-
minal.
o clamped conductors in the connection terminals meet a pull-out test ac-
cording to IEC 60947-1 for 1 minute:
- 30 N pull-out force for 0.5 mm
2
cross section and
- 50 N pull-out force for 2.5 mm
2
cross section
• The connection of superfine stranded conductors of class 6, according to
IEC 60228, is not permitted.
• If the bushing loosens while opening/closing the connecting terminal of the
bushing, the device must be returned for repair.
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