Selecting The Protective Earth Conductor - Weidmuller Klippon STB Aviso Para Los Instaladores

Selecting the protective earth conductor

Determine minimum protective conductor size from the following table.
Phase conductor
size(mm )
2
1.5
2.5
4
6
10
16
25
35
50
* Only for internal connections
Please note that an M6 earth stud is fitted as standard and this is suitable
for protective conductors of up to 25 mm².
In some circumstances internal earth bonding arrangements may have to
be made. An M6 earth stud is also welded to the inside of the enclosure lid
NB. To use the earth stud in the lid you must use M6 nuts, washers etc.
When connecting an earth conductor to the lid, ensure that it is of sufficient
length to allow for normal operation without stretching, e.g. when lid is
removed.
It is sometimes a requirement of the customer to fit an earth bar assembly
into an enclosure. This consists of an earth busbar that is mounted on
support blocks and is fitted with the required number of ZB clamps.
Earth terminals and ZB clamps fitted inside an enclosure do not count
towards the overall terminal content, but they must be considered for
creepage and clearance distances.
The installer is responsible for earthing and bonding arrangements external
to the enclosures.
28
Minimum protective
conductorsize(mm
1.5*
2.5*
4
6
10
16
16
16
25
)
2