BERTHOLD TECHNOLOGIES Uni-Probe LB 490, User Manual

Page: 185 / 730

Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
2 – 185
Volume 2 3 Electrical Installation
2
3.1.1 Please keep in mind for ATEX connection type
Explosion hazard!
Use ATEX-approved screwed cable glands for the respective type of
protection.
The connected cables must not be exposed to any tensile stress,
but have to be installed strain-relieved. We suggest that you make
a cable loop before inserting the cable into the housing.
If there is any danger that the cable may be misused as a steplad-
der, then the cables have to be installed properly protected, for
example in conduit pipes.
The screwed cable glands have to be installed professionally.
Tighten the screw fitting using the appropriate torque to fix the
cable. For information on torque for screw fittings purchased
through BERTHOLD TECHNOLOGIES please see chapter
"6 Technical Drawings".
Use only cable cross-sections which are included in the specifica-
tion of the screwed cable gland used. The pressure-resistant
screwed cable glands must be adequate for volumes of >2 liters.
According to the ATEX approval, only one adapter is permitted per
cable entry. It is not permitted to screw several adapters together.
For screwed cable glands with metric male screw thread you need
ATEX-approved adapters “NPT / metric”. BERTHOLD
TECHNOLOGIES is offering the following adapters:
• ¾" NPT male thread to M16 female thread
• ¾" NPT male thread to M20 female thread
Ground conductor
The ground conductor has to be connected to the internal ground-
ing screw using a fairly short cable (see Figure 3-1 on page 2–
184).
Equipotential bonding
Connect the device to an equipotential busbar (see Figure 3-1).
Cable screens can be connected to the internal grounding screw
using a fairly short cable.
Cable bushing in connection box Non-armored cables
Pass the connection cable with the complete outer insulation
through the cable bushing into the connection box. Pull the hexa-
gon nuts of the cable bushings tight to ensure the connection box is
leak tight and the connection points will be strain relieved. The
tightening torques for the screwed cable glands supplied by
BERTHOLD TECHNOLOGIES are listed in the technical documents in
chapter 5, page 2–247.
Armored cables
Special screwed cable glands are needed for armored cables. How
to install these cables is described in the installation instructions for
the cable conduits used.