Guidelines for Electrical Installation
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9.3.7
Potential compensation
Potential differences can occur between installation components that are in separate areas if these
are fed by different supplies,
have double-sided conductor shields which are grounded on different installation components.
A potential-compensation cable must be routed to the potential compensation.
A potential compensation cable must have the following characteristics:
Low impedance. In the case of compensation cables that are routed on both sides, the compen
-
sation line impedance must be considerably smaller than that of the shield connection (max. 10%
of shield connection impedance).
Should the length of the compensation cable be less than 200 m, then its cross-section must be
at least 16 mm
2
/0.025 inch
2
. If the cable length is greater than 200 m, then a cross-section of at
least 25 mm
2
/0.039 inch
2
is required.
The compensation cable must be made of copper or zinc coated steel.
The compensation cable must be connected to the protective conductor over a large surface
area and must be protected against corrosion.
Compensation cables and data cables should be routed as close together as possible, meaning
the enclosed area should be kept as small as possible.
9.3.8
Switching inductive loads
In the case of inductive loads, a protective circuit on the load is recommended.
9.3.9
Protection against Electrostatic Discharge (ESD)
NOTICE
Exposed metal contacts
Material damage due to electrostatic discharge
†
Avoid to touch the metallic contacts with bare hands
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