Strain Relief, Cable Systems Vde 0100-520 - OBO Bettermann A Series Mounting And Installation

Mounting and installation information for junction boxes
Strain relief clips

3.7. Strain relief, cable systems VDE 0100-520

Cable systems must be selected and erected in such
a way that damage is avoided during the erection, op-
eration and maintenance work. The tension on a cable
should not exceed the values stated below. This is de-
pendent on a maximum tensile strength of 1,000 N or a
value agreed with the manufacturer.
• 50 N/mm² for non-flexible cables during routing.
• 15 N/mm² for flexible cables with maintained tensile
loading and non-flexible cables during operation in
permanently installed circuits.
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Cable glands
When the above-mentioned values are exceeded, suit-
able measures must be taken. This can be implemented
using a suitable, separated agent/product. This agent
may not damage the cables.
For junction boxes, this specification can take place us-
ing various measures. On the one hand, through the use
of a suitable cable gland, which is directly inserted into
the box, and, on the other, through the use of suitable
strain relief clips, which are mounted outside the box.