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Earth Stud Selection
Determine minimum protective conductor size from the following table.
Phase contuctor size
(mm
)
2
1.5
2.5
4
6
10
16
25
35
50
* 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 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.
Minimum protective
conductor size (mm
1.5*
2.5*
4
6
10
16
16
16
25
)
2
7
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