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Chapter 3 – Electrical Installation
Single-core Cables with
Concentric Protective
Shields
Concentric shield
3-12
When single-core cables equipped with concentric protective shields
(metal) are used, the phase current will induce voltage to the cable
shield. If the shields are connected to each other at both ends of the
cable, current will flow in the cable shield. In order to prevent this and
to ensure personal safety, the cable shield must be connected only to
PE at the transformer side and insulated on the converter side. The
connection is represented below.
Transformer
L1
L2
L3
N
PE
Factory main earthing bus
ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters
Converter
L1
L2
L3
PE
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