Specifications

31
Schneider Electric
Implementation guidelines (continued)
Placing cabinets together
When equipment is placed in a number of side-by-side cabinets the following rules
must be followed:
b Attach the cabinets to form islands.
b Ensure equipotential bonding of the cabinets with at least two contacts at the top
and bottom.
b The bonding should be made up of:
v copper bars
v or wide, short leaf metal,
v or tinned braid.
b Use conducting false floors to provide an effective equipotential grid.
b Scratch paint to provide contact and use fan type washers.
The cross-section of equipotential bonding conductors is unimportant; only their
length matters: they must be no longer than 50 cm.
Use of trunking
Trunking on the outside of cabinets must be made of metal if they are longer than
3 m.
To guarantee proper continuity, trunking should be connected to the exposed
conductive parts of cabinets or machines using splices or leaf metal.
If a single trunking assembly is used, it must be no longer than 30 m.
Equipotentiality must be guaranteed for
cabinets placed side by side.
E52305
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50 cm maximum
Trunking should be used for equipotential
bonding.
E52306
Cabling Guidelines