Chapter 3 – Electrical Installation
3-12 ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters
Single-core Cables with
Concentric Protective
Shields
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.
L1
L2
L3
N
Transformer Converter
L1
L2
L3
PE
PE
Factory main earthing bus
Concentric shield
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