Specifications

14
Schneider Electric
Review
(continued)
Example of a grounding system for a building
An effective solution is the interconnection of the metal structures with a mesh size
of 2 m x 2 m.
The metal frames of cabinets and bays must be connected to the neighbouring metal
parts (cableways, machines, frames, etc.).
A standardised immunity test (IEC 61000-4-4) using repeated pulses can quickly
check the grounding effectiveness (cableways in particular) near the injection points
and the screen termination points of shielded cables.
E52277
Computer
room or island
y 2 m
y 3 m
Rebar
Metal
frames
Corner-point
Buried earthing ring
Meshed
riser
Lightning rod
Cabling Guidelines